Provided by: nfdump_1.6.23-1_amd64 bug


       nfdump - netflow display and analyze program


       nfdump [options] [filter]


       nfdump  is the netflow display and analyzing program of the nfdump tool set.  It reads the
       netflow data from files stored by nfcapd and processes the flows according to the  options
       given.  The  filter  syntax is comparable to tcpdump and extended for netflow data. Nfdump
       can also display many different top N flow and flow element statistics.


       -r inputfile
          Read input data from inputfile. Default is to read from stdin.

       -R expr
          Read input from a sequence of files in the same directory. expr may be one of:
           /any/dir          Read recursively all files in directory dir.
           /dir/file         Read all files beginning with file.
           /dir/file1:file2  Read all files from file1 to file2.

           When using in combination with a sub hierarchy:
           Read all files  from  sub1/sub2/file1  sub3/sub4/file2  iterating  over  all  required
           hierarchy levels.

           Note: files are read in alphabetical order.

       -M expr
          Read input from multiple directories. expr looks like: /any/path/to/dir1:dir2:dir3 etc.
          and will be expanded  to  the  directories:  /any/path/to/dir1,  /any/path/to/dir2  and
          /any/path/to/dir3  Any number of colon separated directories may be given. The files to
          read are specified by -r or -R and are expected to exist in all the given  directories.
          The options -r and -R must not contain any directory part when used in conjunction with

       -m deprecated option. Use -O tstart instead.

       -O order[:direction]
          Set sort order to print raw or aggregated flows. Optionally add an order direction  'a'
          for ascending or 'd' for descending. order can be:
            by default descending:
            flows    Sort according to the number of flows
            packets  Sort according to (in)packets
            ipkg     Same as packets
            opkg     Sort according to output packets
            bytes    Sort according to (in)bytes
            ibyte    Same as bytes
            obyte    Sort according to output bytes
            pps      Sort according to (in)packets per second
            ipps     Same as ipps
            opps     Sort according to out packets per second
            bps      Sort according to (in)bytes per second
            ibps     Same as bps
            obps     Sort according to output bytes per second
            bpp      Sort according to (in)bytes per packet
            ibpp     Same as bpp
            obpp     Sort according to output packets
            by default ascending:
            tstart   Sort according to start time of flow - former -m
            tend     Sort according to end time of flows

       -w outputfile
          If  specified  writes  binary netflow records to outputfile ready to be processed again
          with nfdump. The default output is ASCII on stdout. In combination with options -m, -a,
          -b, and -B write aggregated and/or sorted flow cache in binary format to disk.

       -f filterfile
          Reads  the  filter  syntax  from filterfile. Note: Any filter specified directly on the
          command line takes precedence over -f.

       -t timewin
          Process  only  flows  which  fall  in  the  time  window  timewin,  where  timewin   is
          YYYY/MM/dd.hh:mm:ss[-YYYY/MM/dd.hh:mm:ss].  Any  parts  of the time spec may be omitted
          e.g YYYY/MM/dd expands to YYYY/MM/dd.00:00:00-infinity and processes all  flow  from  a
          given  day  onwards. The time window may also be specified as +/- n. In this case it is
          relativ to the beginning or end of all flows. +10 means the first  10  seconds  of  all
          flows, -10 means the last 10 seconds of all flows.

       -c num
          Limit the number of records to read and process from file(s) to the first num flows.

       -a Aggregate  netflow  data. Aggregation is done at connection level by taking the 5-tuple
          protocol, srcip, dstip, srcport and dstport.

       -A aggregation
          Similar to Flexible Netflow (FNF), netflow records can be aggregated by any  number  of
          given  v9  fields.  aggregation  is  a  ','  separated list of recognised tags from the
          following list:
            proto      IP protocol
            srcip      Source IP address
            dstip      Destination IP address
            srcip4/net IPv4 source IP address with applied netmask
            srcip6/net IPv6 source IP address with applied netmask
            dstip4/net IPv4 destination IP address with applied netmask
            dstip6/net IPv6 destination IP address with applied netmask
            srcnet     Apply netmask srcmask in netflow record for source IP
            dstnet     Apply netmask dstmask in netflow record for dest IP
            srcport    Source port
            dstport    Destination port
            srcmask    Source mask
            dstmask    Destination mask
            srcvlan    Source vlan label
            dstvlan    Destination vlan label
            srcas      Source AS number
            dstas      Destination AS number
            nextas     BGP Next AS
            prevas     BGP Previous AS
            inif       SNMP input interface number
            outif      SNMP output interface number
            next       IP next hop
            bgpnext    BGP next hop
            insrcmac   In source MAC address
            outdstmac  out destination MAC address
            indstmac   In destintation MAC address
            outsrcmac  Out source MAC address
            tos        Source type of service
            srctos     Source type of Service
            dsttos     Destination type of Service
            mpls1      MPLS label 1
            mpls2      MPLS label 2
            mpls3      MPLS label 3
            mpls4      MPLS label 4
            mpls5      MPLS label 5
            mpls6      MPLS label 6
            mpls7      MPLS label 7
            mpls8      MPLS label 8
            mpls9      MPLS label 9
            mpls10     MPLS label 10
            router     Exporting router's IP
            xsrcip     X-late source IP address, if compiled with NSEL support
            xdstip     X-late destination IP address, if compiled with NSEL support
            xsrcport   X-late source port, if compiled with NSEL support
            xdstport   X-late destination port, if compiled with NSEL support

          nfdump automatically compiles an appropriate output format for the selected aggregation
          unless  an explicit output format is given. The automatic output format is identical to
          -o 'fmt:%ts %td <fields> %pkt  %byt  %bps  %bpp  %fl'  where  <fields>  represents  the
          selected aggregation tags.

              -A proto,srcip,dstport

              -A srcas,dstas

       -b Aggregate   netflow   records   as   bidirectional  flows.  Automatically  implies  -a.
          Aggregation is done on connection level by taking the 5-tuple protocol,  srcip,  dstip,
          srcport  and dstport, or the reverse order for the corresponding connection flow. Input
          and output packets/bytes are counted and reported separately.  Both  flows  are  merged
          into a single record. An appropriate output format is selected automatically, which may
          be overwritten by any -o format option.

       -B Like -b but automagically swaps flows if src port is < dst port for TCP and  UDP  flows
          and  src  port  <  1024 and dst port > 1024.  as some exporters do not care sending the
          flows in proper  order.  Other  flows  are  not  affected.  It's  considered  to  be  a
          conveniency option.

       -I Print flow statistics from file specified by -r, or timeslot specified by -R/-M.

       -D dns
          Set dns as nameserver to look up hostnames.

       -s statistic[:p][/orderby[:direction]]
          Generate the Top N flow or flow element statistic. statistic can be:
            record    Statistic about aggregated netflow records.
            srcip     Statistic about source IP addresses
            dstip     Statistic about destination IP addresses
            ip        Statistic about any (source or destination) IP addresses
            nhip      Statistic about next hop IP addresses
            nhbip     Statistic about BGP next hop IP addresses
            router    Statistic about exporting router IP address
            srcport   Statistic about source ports
            dstport   Statistic about destination ports
            port      Statistic about any (source or destination) ports
            tos       Statistic about type of service - default src
            srctos    Statistic about src type of service
            dsttos    Statistic about dst type of service
            dir       Statistic about flow directions ingress/egress
            srcas     Statistic about source AS numbers
            dstas     Statistic about destination AS numbers
            as        Statistic about any (source or destination) AS numbers
            inif      Statistic about input interface
            outif     Statistic about output interface
            if        Statistic about any interface
            srcmask   Statistic about src mask
            dstmask   Statistic about dst mask
            srcvlan   Statistic about src vlan label
            dstvlan   Statistic about dst vlan label
            vlan      Statistic about any vlan label
            insrcmac  Statistic about input src MAC address
            outdstmac Statistic about output dst MAC address
            indstmac  Statistic about input dst MAC address
            outsrcmac Statistic about output src MAC address
            srcmac    Statistic about any src MAC address
            dstmac    Statistic about any dst MAC address
            inmac     Statistic about any input MAC address
            outmac    Statistic about any output MAC address
            mask      Statistic about any mask
            proto     Statistic about IP protocols
            mpls1     Statistic about MPLS label 1
            mpls2     Statistic about MPLS label 2
            mpls3     Statistic about MPLS label 3
            mpls4     Statistic about MPLS label 4
            mpls5     Statistic about MPLS label 5
            mpls6     Statistic about MPLS label 6
            mpls7     Statistic about MPLS label 7
            mpls8     Statistic about MPLS label 8
            mpls9     Statistic about MPLS label 9
            mpls10    Statistic about MPLS label 10
            sysid     Internal SysID of exporter

            NSEL/ASA statistics
            event     NSEL/ASA event
            xevent    NSEL/ASA extended event
            xsrcip    NSEL/ASA translated src IP address
            xsrcport  NSEL/ASA translated src port
            xdstip    NSEL/ASA translated dst IP address
            xdstport  NSEL/ASA translated dst port
            iacl      NSEL/ASA ingress ACL
            iace      NSEL/ASA ingress ACE
            ixace     NSEL/ASA ingress xACE
            eacl      NSEL/ASA egress ACL
            eace      NSEL/ASA egress ACE
            exace     NSEL/ASA egress xACE

            NAT statistics
            nevent    NAT event
            vrf/ivrf  NAT ingress vrf
            evrf      NAT egress vrf
            nsrcip    NAT src IP address
            nsrcport  NAT src port
            ndstip    NAT dst IP address
            ndstport  NAT dst port

          By  adding :p to the statistic name, the resulting statistic is split up into transport
          layer protocols. Default is transport protocol independent statistics.

          orderby is optional and specifies the order by which the statistics are ordered and can
          be  flows, packets, bytes, pps, bps or bpp. You may specify more than one orderby which
          results in the same  statistic  but  ordered  differently.  If  no  orderby  is  given,
          statistics are ordered by flows.  Optionally to the order you add a :direction ':a' for
          ascending or ':d'  for  descending.   By  default  all  -s  statitics  are  printed  in
          descending  order.  You can specify as many -s flow element statistics as needed on the
          command line for the same run.

             -s srcip -s ip/flows -s dstport/pps/packets/bytes -s record/bytes

       -l [+/-]packet_num
          Limit statistics  output  to  those  records  above  or  below  the  packet_num  limit.
          packet_num accepts positive or negative numbers followed by 'K' , 'M' or 'G' 10E3, 10E6
          or 10E9 flows respectively. See also note at -L

       -L [+/-]byte_num
          Limit statistics output to those records above or below the  byte_num  limit.  byte_num
          accepts  positive  or  negative numbers followed by 'K' , 'M' or 'G' 10E3, 10E6 or 10E9
          bytes respectively. Note: These limits only apply  to  the  statistics  and  aggregated
          outputs  generated with -a -s.  To filter netflow records by packets and bytes, use the
          filter syntax 'packets' and 'bytes' described below.

       -n num
          For record statistics (-s .. ): Define the number for the Top N. Defaults to  10.   Use
          -n 0 to list all records.
          For  record  sorting  and aggregation (-a .. -O ..): Limit the records to the first top
          num sorted records.  if not specified or -n 0 is given, all records are listed.

       -o format
          Selects the output format to print flows or flow record  statistics  (-s  record).  The
          following formats are available:
            raw      Print full flow record on multiple lines.
            line     Print each flow on one line. Default format.
            long     Print each flow on one line with more details
            biline   Same as line, but for bidir flows
            bilong   Same as long, but for bidir flows
            extended Print each flow on one line with even more details.
            nsel     Print each NSEL event on one line. Default if NSEL/NAT
            nel      Print each NAT event on one line.
            csv      Comma separated output for machine readable processing.
            json     Print full record as separate json object.
            pipe     Legacy machine readable format: fields are '|' separated.
            fmt:format User defined output format.
          For  each  defined  output  format  except  -o  fmt:<format> an IPv6 long output format
          exists.  line6, long6 and extended6. See output formats below for more information.

       -q Be quiet. Suppress the header line and the statistics at the bottom.

       -N Print plain numbers in output. Easier for post-parsing.

       -i ident
          Change ident label in file, specified by -r to ident

       -v file
          Verify file. Print data file version, number of blocks and compression status.

       -E file
          Print exporter/sampler list found  in  file.  In  case  of  a  nfcapd  collector  file,
          additional  statistics  per  exporter  are  printed  with  number of flows, packets and
          sequence errors.

       -x file
          Scan and print extension maps located in file file

       -j Compress flows. Use bz2 compression in output file. Space efficient method

       -y Compress flows. Use LZ4 compression in output file. Time efficient method

       -z Compress flows. Use fast LZO1X-1 compression in output file. Time efficient method

       -J num
          Change compression for file(s) given by -r <file> or -R <dir>  num:  0  uncompress,  1:
          LZO1X-1, 2: bz2, 3: LZ4 compression

       -Z Check filter syntax and exit. Sets the return value accordingly.

       -X Compiles  the  filer  syntax  and dumps the filter engine table to stdout.  This is for
          debugging purpose only.

       -V Print nfdump version and exit.

       -h Print help text on stdout with all options and exit.


           0   No error.
           255 Initialization failed.
           254 Error in filter syntax.
           250 Internal error.


       The output format raw prints each flow record on multiple lines, including all information
       available in the record. This is the most detailed view on a flow.

       Other output formats print each flow on a single line. Predefined output formats are line,
       long and extended The output format line is the default output format when  no  format  is
       specified.   It  limits  the  imformation  to  the connection details as well as number of
       packets, bytes and flows.

       The output  format  long  is  identical  to  the  format  line,  and  includes  additional
       information such as TCP flags and Type of Service.

       The  output  format  extended  is  identical  to  the format long, and includes additional
       computed information such as pps, bps and bpp.


          Date flow start: Start time  the  flow  was  first  seen.  ISO  8601  format  including

          Duration:  Duration  of the flow in seconds and milliseconds.  If flows are aggregated,
          duration is the time span over the entire period of time from first seen to last seen.

          Proto: Protocol used in the connection.

          Src IP Addr:Port: Source IP address and source port.

          Dst IP Addr:Port: Destination IP address and destination port.  In case of  ICMP,  port
          is decoded as type.code.

          Flags: TCP flags OR-ed of the connection.

          Tos: Type of service.

          Packets:  The  number of packets in this flow. If flows are aggregated, the packets are
          summed up.

          Bytes: The number of bytes in this flow. If flows are aggregated, the bytes are  summed

          pps:  The  calculated  packets  per second: number of packets / duration.  If flows are
          aggregated this results in the average pps during this period of time.

          bps: The calculated bits per second: 8 * number of  bytes  /  duration.  If  flows  are
          aggregated this results in the average bps during this period of time.

          Bpp: The calculated bytes per packet: number of bytes / number of packets. If flows are
          aggregated this results in the average bpp during this period of time.

          Flows: Number of flows. If flows are listed only, this number is always 1. If flows are
          aggregated, this shows the number of flows aggregated in this one record.

       Numbers  larger  than  1'000'000 (1000*1000), are scaled to 4 digits and one decimal digit
       including the scaling factor M, G or T for cleaner output, e.g. 923.4 M

       To make the output more readable, IPv6 addresses are shrinked down to 16  characters.  The
       seven  leftmost  and  seven rightmost digits connected with two dots '..' are displayed in
       any normal output formats. To display the full IPv6  address,  use  the  appropriate  long
       format, which is the format name followed by a 6.

       Example:  -o  line  displays an IPv6 address as 2001:23..80:d01e where the format -o line6
       displays  the  IPv6  address  in  full  length   2001:234:aabb::211:24ff:fe80:d01e.    The
       combination of -o line -6 is equivalent to -o line6.

       The  output  format  fmt:<format>  allows  you to define your own output format.  A format
       description format consists of a single  line  containing  arbitrary  strings  and  format
       specifier as described below

          %<format> Inserts the predefined format at this position. e.g. %line
          %ff       flow record flags in hex.
          %nfv      Netflow/Sflow/Event record version.
          %ts       Start Time - first seen
          %tsr      Start Time, but in fractional seconds since the epoch (1970-01-01)
          %te       End Time - last seen
          %ter      End Time, in fractional seconds
          %tr       Time the flow was received by the collector
          %trr      Time the flow was received, in fractional seconds
          %td       Duration
          %pr       Protocol
          %exp      Exporter ID
          %eng      Engine Type/ID
          %lbl      Flowlabel
          %sa       Source Address
          %da       Destination Address
          %sap      Source Address:Port
          %dap      Destination Address:Port
          %sp       Source Port
          %dp       Destination Port
          %sn       Source Network, mask applied
          %dn       Destination Network, mask applied
          %nh       Next-hop IP Address
          %nhb      BGP Next-hop IP Address
          %ra       Router IP Address
          %sas      Source AS
          %das      Destination AS
          %nas      Next AS
          %pas      Previous AS
          %in       Input Interface num
          %out      Output Interface num
          %pkt      Packets - default input
          %ipkt     Input Packets
          %opkt     Output Packets
          %byt      Bytes - default input
          %ibyt     Input Bytes
          %obyt     Output Bytes
          %fl       Flows
          %flg      TCP Flags
          %tos      Tos - default src
          %stos     Src Tos
          %dtos     Dst Tos
          %dir      Direction: ingress, egress
          %smk      Src mask
          %dmk      Dst mask
          %fwd      Forwarding Status
          %bfd      BiFlow Direction
          %svln     Src vlan label
          %dvln     Dst vlan label
          %ismc     Input Src Mac Addr
          %odmc     Output Dst Mac Addr
          %idmc     Input Dst Mac Addr
          %osmc     Output Src Mac Addr
          %mpls1    MPLS label 1
          %mpls2    MPLS label 2
          %mpls3    MPLS label 3
          %mpls4    MPLS label 4
          %mpls5    MPLS label 5
          %mpls6    MPLS label 6
          %mpls7    MPLS label 7
          %mpls8    MPLS label 8
          %mpls9    MPLS label 9
          %mpls10   MPLS label 10
          %mpls     MPLS labels 1-10
          %bps      bps - bits per second
          %pps      pps - packets per second
          %bpp      bps - Bytes per package

          NSEL specific formats
          %nfc      NSEL connection ID
          %evt      NSEL event
          %xevt     NSEL extended event
          %sgt      NSEL Source security group tag
          %msec     NSEL event time in msec
          %iacl     NSEL ingress ACL
          %eacl     NSEL egress ACL
          %xsa      NSEL XLATE src IP address
          %xda      NSEL XLATE dst IP address
          %xsp      NSEL XLATE src port
          %xdp      NSEL SLATE dst port
          %xsap     Xlate Source Address:Port
          %xdap     Xlate Destination Address:Port
          %uname    NSEL user name

          NEL/NAT specific formats
          %nevt     NAT event - same as %evt
          %ivrf     NAT ingress VRF ID
          %evrf     NAT egress VRF ID
          %nsa      NAT src IP address
          %nda      NAT dst IP address
          %nsp      NAT src port
          %ndp      NAT dst port
          %pbstart  NAT pool block start
          %pbend    NAT pool block end
          %pbstep   NAT pool block step
          %pbsize   NAT pool block size

          Nprobe formats
          %cl       Client latency
          %sl       Server latency
          %al       Application latency

       The  "flow  flags"  format  (%ff) prints the internal record flags as a single hexadecimal
       number, consisting of any of these flag values OR-ed together:

          1    Record contains IPv6 addresses
          2    Packet counters are 64-bit
          4    Byte counters are 64-bit
          8    IP next hop is an IPv6 address
          16   BGP next hop is an IPv6 address
          32   Exporting router is an IPv6 address
          64   Record is an EVENT record
          128  Record is sampled

       Example: the standard output format long can be created as
          -o "fmt:%ts %td %pr %sap -> %dap %flg %tos %pkt %byt %fl"

       You may also define your own output format and have it compiled into nfdump.  See nfdump.c
       section Output Formats for more details.

       The csv output format is intended to be read by another program for further processing. As
       an example, see the Perl program.  The csv output format consists of  one  or
       more  output  blocks and one summary block. Each output block starts with a csv index line
       followed by the csv record lines. The index lines describes the order, how each  following
       record is composed.

          Index line:   ts,te,td,sa,da,sp,dp,pr,...
          Record line:  2004-07-11 10:30:00,2004-07-11 10:30:10,10.010,...

       All records are in ASCII readable form. Numbers are not scaled, so each line can be easily

       Indices used in nfdump 1.6:

          ts,te,td    time records: t-start, t-end, duration
          sa,da       src dst address sp,dp       src, dst port
          pr          protocol PF_INET or PF_INET6
          flg         TCP Flags:
                         000001 FIN.
                         000010 SYN
                         000100 RESET
                         001000 PUSH
                         010000 ACK
                         100000 URGENT
                         e.g. 6 => SYN + RESET
          fwd         forwarding status
          stos        src tos
          ipkt,ibyt   input packets/bytes
          opkt,obyt   output packets, bytes
          in,out      input/output interface SNMP index number
          sas,das     src, dst AS
          smk,dmk     src, dst mask
          dtos        dst tos
          dir         direction
          nh,nhb      next hop IP address, bgp next hop IP
          svln,dvln   src, dst vlan id
          ismc,odmc   input src, output dst MAC
          idmc,osmc   input dst, output src MAC
          mpls1,mpls2 MPLS label 1-10
          ra          router IP
          eng         router engine type/id

       See for more details.


       The filter syntax is similar to the well known pcap library used by tcpdump.   The  filter
       can  be  either  specified on the command line after all options or in a separate file. It
       can span several lines. Anything after a '#' is treated as a comment and  ignored  to  the
       end  of  the line. There is virtually no limit in the length of the filter expression. All
       keywords are case insensitive.

       Any filter consists of one or more expressions expr. Any number  of  expr  can  be  linked

       expr and expr, expr or expr, not expr and ( expr ).

       Expr can be one of the following filter primitives:

           @include <file>
           include the content of <file> into filter.

       ip version
           inet  or ipv4 for IPv4
           inet6 or ipv6 for IPv6

           proto <protocol>
           proto <number>
           where  <protocol>  is known protocol such as tcp, udp, icmp, icmp6, gre, esp, ah, etc.
           or a valid protocol number: 6, 17 etc.

       IP address
           [src|dst] ip <ipaddr>
           [src|dst] host <ipaddr>
           with <ipaddr> as any valid IPv4, IPv6 address, or a fully qualified hostname.  In case
           of  a  hostname, the IP address is looked up in DNS.  If more than a single IP address
           is found, all IP addresses are chained together. (ip1 or ip2 or ip3 ... )

           To check if an IP address is in a known IP list, use
           [src|dst] ip in [ <iplist> ]
           [src|dst] host in [ <iplist> ]
           <iplist> is a space or comma separated list of individual <ipaddr> or fully  qualified
           hostnames,  which are looked up in DNS. If more than a single IP address is found, all
           IP addresses are put into the list.

           IP addresses, networks, ports, AS numbers etc. can be specifically selected by using a
           direction  qualifier,  such  as src or dst.  They can also be used in combination with
           and and or.  such as src and dst ip ...

           [src|dst] net a.b.c.d m.n.r.s
           Select the IPv4 network a.b.c.d with netmask m.n.r.s.

           [src|dst] net <net>/<num>
           with <net> as a valid IPv4 or IPv6 network and <num> as mask bits.  The number of mask
           bits  must  match  the  appropriate  address  family  in IPv4 or IPv6. Networks may be
           abbreviated such as 172.16/16 if they are unambiguous.

           [src|dst] port [comp] <num>
           with <num> as any valid port number.  If comp is omitted,
            '=' is assumed. comp is explained in more details below.
           [src|dst] port in [ <portlist> ]
           A port can be compared against a know list, where <portlist> is a space separated list
           of individual port numbers.

           icmp-type <num>
           icmp-code <num>
           with <num> as a valid icmp type/code. This automatically implies proto icmp.

       Router ID
           engine-type <num>
           engine-id <num>
           sysid <num>
           with <num> as a valid router engine type/id or exporter ID(0..255).

       Netflow version
           nfversion [comp] <num>
           netflow version exported.

           [in|out] if <num>
           Select input or output or either interface ID, with num as the SNMP interface number.
           Example: in if 3

       AS numbers
           [src|dst|prev|next] as [comp] <num>
           Selects  source,  destination, previous, next or any AS number with <num> as any valid
           as number. 32-bit AS numbers are supported. If comp is omitted, '=' is  assumed.  comp
           is explained in more details below.

           [src|dst|prev|next] as in [ <ASlist> ]
           An  AS  number can be compared against a know list, where <ASlist> is a space or comma
           separated list of individual AS numbers.

       Prefix mask bits
           [src|dst] mask <bits>
           with <bits> as any valid prefix mask bit value.

       Vlan labels
           [src|dst] vlan <num>
           with <num> as any valid vlan label.

           flags <tcpflags>
           with <tcpflags> as a combination of:
              A    ACK.
              S    SYN.
              F    FIN.
              R    Reset.
              P    Push.
              U    Urgent.
              X    All flags on.
       The ordering of the flags is not relevant. Flags not mentioned are treated as don't  care.
       In  order  to  get those flows with only the SYN flag set, use the syntax 'flags S and not
       flags AFRPU'.

       Next hop IP
           next ip <ipaddr>
           with <ipaddr> as IPv4/IPv6 IP address of next hop router.

       Next-hop router's IP in the BGP domain
           bgpnext ip <ipaddr>
           with <ipaddr> as IPv4/IPv6 next-hop router's IP in the BGP domain. ( v9 #18 )

       Router IP
           router ip <ipaddr>
           Filter the flows according the IP address of the exporting router.

       MAC addresses
           [InOutSrcDst] mac <addr>
           With <addr> any valid MAC address.  mac  can  be  made  more  specific  by  using  any
           combination of a direction specifier as defined by CISCO v9.  in src, in dst, out src,
           out dst.

       MPLS labels
           mpls label<n> [comp] <num>
           With <n> as any mpls label number 1..10. Filters exactly specified label<n>.
           mpls eos [comp] <num>
           Filters End of Stack label for a given value <num>.
           mpls exp<n> [comp] <bits>
           Filters experimental bits of label <n> with <bits> 0..7.

           packets [comp] <num> [scale]
           To filter for netflow records with a specific packet count.
           Example: packets > 1k

           bytes [comp] <num> [scale]
           To filter for netflow records with a specific byte count.
           Example: bytes 46 filters all empty IPv4 packets

       Aggregated flows
           flows [comp] <num> [scale]
           To filter for netflow records with a specific number of aggregated flows.

       Type of Service (TOS)
           [SourceDestination] tos <num>
           With <num> 0..255. For compatibility with nfdump 1.5.x: tos <num> is  equivalent  with
           src tos <num>

       Packets per second: Calculated value.
           pps [comp] num [scale]
           To filter for flows with specific packets per second.

       Duration: Calculated value
           duration [comp] num
           To filter for flows with specific duration in milliseconds.

       Bits per second: Calculated value.
           bps [comp] num [scale]
           To filter for flows with specific bytes per second.

       Bytes per packet: Calculated value.
           bpp [comp] num [scale]
           To filter for flows with specific bytes per packet.

       scale scaling factor. Maybe k m g. Factor is 1000

       comp The following comparators are supported:
           =, ==, >, <, >=, <=, EQ, LT, GT, LE, GE .  If comp is omitted, '=' is assumed.

       NSEL/ASA specific filters:

       NSEL/ASA Event
           asa event <ignore|create|term|delete|deny>
           asa event [comp] <number>
           select  NSEL/ASA event by name or number. If given as number it can be compared with a

       NSEL/ASA denied reason
           asa event denied <ingress|egress|interface|nosyn>
           Select a NSEL/ASA denied event by type

       NSEL/ASA extended events
           asa xevent [comp] <num>
           Select an extended NSEL ASA event by number, or optionally compared by a number.

       X-late IP addresses and ports
           [src|dst] xip <ip>
           Select the translated IP address - identical to nip

           [src|dst] xnet <net>/<num>
           with <net> as a valid translated IPv4 or IPv6 network and <num>  as  mask  bits.   The
           number  of  mask  bits  must  match  the  appropriate  address family in IPv4 or IPv6.
           Networks may be abbreviated such as 172.16/16 if they are unambiguous.

           [src|dst] xport <port>
           Select the translated port

       NSEL/ASA ingress/egress
           ingress <ACL|ACE|XACE> [comp] number
           Select/compare an ingress ACL

           egress ACL [comp] <number>
           Select/compare an egress ACL

       NEL specific NAT filters:

       NAT Event
           nat event <add|delete>
           nat event [comp] <number>
           select NEL NAT event by name or number. If given as number it can be compared  with  a

       NEL NAT ip addresses and ports
           [src|dst] nip <ip>
           Match NAT IP address

           [src|dst] nip in [ <iplist> ]
           Match NAT IP from list <iplist> - see ip in [ <iplist> ] for syntax.

           [src|dst] nport <port>
           Match NAT port

       NEL NAT vrf
           ingress vrf <num>
           Select the vrf


       One  or  more specific filter expressions can be assigned a flowlabel in order to identify
       the flow in the output according to the label. A flowlabel has the form %LabelName and  is
       appended  or  prepended to a filter expression in braces. It may have up to 16 characters.
       Example: (ip %GoogleDNS. If a filter matches, with  a  labeled  expressions,  and
       that  expression  is  in the matching filter path, the label can be printed in the output,
       using the %%lbl format token. See OUTPUT FORMATS.  Example: Add flowlabel to end of 'line'
       ./nfdump -r <file> -o 'fmt:%line %lbl" ..
       Note:  A filter may have multiple matching paths - for example proto tcp or ip The
       shortest path which evaluates successfully wins. Other paths are skipped, which means that
       flowlabels  are  not  printed in not evaluated filter paths. A filter may contain multiple
       flowlabels. The flowlabel of the last matching expression in the winning path is  printed.
       Flowlabels  are  most useful in large and complex filters stored in one or multiple files,
       to better read the flow output list.
       Example:  (ip  in  [])  %ISP_1  or  (ip  in   [])   %IPS_2   or
       %GoogleDNS((proto udp or proto tcp) and ip


       nfdump  -r /and/dir/nfcapd.201107110845 -c 100 'proto tcp and ( src ip or dst
       ip )' Dumps the first 100 netflow records which match the given filter:

       nfdump -r /and/dir/nfcapd.201107110845 -B Map  matching  flows  as  bi-directional  single

       nfdump  -R  /and/dir/nfcapd.201107110845:nfcapd.200407110945  'host' Dumps all
       netflow records of host from July 11 08:45 - 09:45

       nfdump -M /to/and/dir1:dir2 -R nfcapd.200407110845:nfcapd.200407110945  -s  record  -n  20
       Generates the Top 20 statistics from 08:45 to 09:45 from 3 sources

       nfdump  -r  /and/dir/nfcapd.201107110845  -s record -n 20 -o extended Generates the Top 20
       statistics, extended output format

       nfdump -r /and/dir/nfcapd.201107110845 -s record -n 20 'in if 5 and bps >  10k'  Generates
       the Top 20 statistics from flows coming from interface with SNMP index of 5

       nfdump  -r /and/dir/nfcapd.201107110845 'inet6 and proto tcp and ( src port > 1024 and dst
       port 80 ) Dumps all port 80 IPv6 connections to any web server.


       Generating the statistics for data files of a few hundred MB is no  problem.  However,  be
       careful  if you want to create statistics of several GB of data. This may consume a lot of
       memory and can take a while. Flow anonymization has moved into nfanon.


       nfcapd(1), nfanon(1), nfprofile(1), nfreplay(1)


       There is still the famous last bug. Please report them - all the last bugs - back to me.

                                            2009-09-09                                  nfdump(1)