trusty (8) conntrack.8.gz

Provided by: conntrack_1.4.1-1ubuntu1_amd64 bug

NAME

       conntrack - command line interface for netfilter connection tracking

SYNOPSIS

       conntrack -L [table] [options] [-z]
       conntrack -G [table] parameters
       conntrack -D [table] parameters
       conntrack -I [table] parameters
       conntrack -U [table] parameters
       conntrack -E [table] [options]
       conntrack -F [table]
       conntrack -C [table]
       conntrack -S

DESCRIPTION

       conntrack  provides  a full featured userspace interface to the netfilter connection tracking system that
       is intended to replace the old /proc/net/ip_conntrack interface. This tool can be used to  search,  list,
       inspect  and  maintain  the connection tracking subsystem of the Linux kernel.  Using conntrack , you can
       dump a list of all (or a filtered selection of) currently tracked connections,  delete  connections  from
       the state table, and even add new ones.

       In  addition,  you can also monitor connection tracking events, e.g. show an event message (one line) per
       newly established connection.

TABLES

       The connection tracking subsystem maintains two internal tables:

       conntrack:
              This is the default table.  It contains a list of all currently tracked  connections  through  the
              system.  If you don't use connection tracking exemptions (NOTRACK iptables target), this means all
              connections that go through the system.

       expect:
              This is the table of expectations.  Connection tracking expectations are  the  mechanism  used  to
              "expect"  RELATED  connections  to  existing ones.  Expectations are generally used by "connection
              tracking helpers" (sometimes called application level gateways [ALGs]) for more complex  protocols
              such as FTP, SIP, H.323.

OPTIONS

       The options recognized by conntrack can be divided into several different groups.

   COMMANDS
       These  options  specify  the  particular  operation to perform.  Only one of them can be specified at any
       given time.

       -L --dump
              List connection tracking or expectation table

       -G, --get
              Search for and show a particular (matching) entry in the given table.

       -D, --delete
              Delete an entry from the given table.

       -I, --create
              Create a new entry from the given table.

       -U, --update
              Update an entry from the given table.

       -E, --event
              Display a real-time event log.

       -F, --flush
              Flush the whole given table

       -C, --count
              Show the table counter.

       -S, --stats
              Show the in-kernel connection tracking system statistics.

   PARAMETERS
       -z, --zero
              Atomically zero counters after reading them.  This option is only valid in  combination  with  the
              "-L, --dump" command options.

       -o, --output [extended,xml,timestamp,id,ktimestamp]
              Display  output in a certain format. With the extended output option, this tool displays the layer
              3 information. With ktimestamp, it displays the in-kernel timestamp available  since  2.6.38  (you
              can enable it via echo 1 > /proc/sys/net/netfilter/nf_conntrack_timestamp).

       -e, --event-mask [ALL|NEW|UPDATES|DESTROY][,...]
              Set  the  bitmask of events that are to be generated by the in-kernel ctnetlink event code.  Using
              this parameter, you can reduce the event messages generated by the kernel to those types to  those
              that  you  are  actually  interested  in.   This  option can only be used in conjunction with "-E,
              --event".

       -b, --buffer-size value (in bytes)
              Set the Netlink socket buffer size. This option is useful if the command line tool reports ENOBUFS
              errors.    If    you    do    not   pass   this   option,   the   default   value   available   at
              /proc/sys/net/core/rmem_default is used. The tool reports this problem if your process is too slow
              to  handle  all  the  event messages or, in other words, if the amount of events are big enough to
              overrun the socket buffer. Note that using a big  buffer  reduces  the  chances  to  hit  ENOBUFS,
              however,  this  results  in  more memory consumption.  This option can only be used in conjunction
              with "-E, --event".

   FILTER PARAMETERS
       -s, --orig-src IP_ADDRESS
              Match only entries whose source address in the original direction  equals  the  one  specified  as
              argument.

       -d, --orig-dst IP_ADDRESS
              Match only entries whose destination address in the original direction equals the one specified as
              argument.

       -r, --reply-src IP_ADDRESS
              Match only entries whose source address in  the  reply  direction  equals  the  one  specified  as
              argument.

       -q, --reply-dst IP_ADDRESS
              Match  only  entries  whose destination address in the reply direction equals the one specified as
              argument.

       -p, --proto PROTO
              Specify layer four (TCP, UDP, ...) protocol.

       -f, --family PROTO
              Specify layer three (ipv4, ipv6) protocol This option is only required in  conjunction  with  "-L,
              --dump". If this option is not passed, the default layer 3 protocol will be IPv4.

       -t, --timeout TIMEOUT
              Specify the timeout.

       -m, --mark MARK[/MASK]
              Specify  the conntrack mark.  Optionally, a mask value can be specified.  In "--update" mode, this
              mask specifies the bits that should be zeroed before  XORing  the  MARK  value  into  the  ctmark.
              Otherwise,  the  mask  is  logically  ANDed  with  the  existing  mark before the comparision.  In
              "--create" mode, the mask is ignored.

       -c, --secmark SECMARK
              Specify the conntrack selinux security mark.

       -u, --status [ASSURED|SEEN_REPLY|FIXED_TIMEOUT|EXPECTED|UNSET][,...]
              Specify the conntrack status.

       -n, --src-nat
              Filter source NAT connections.

       -g, --dst-nat
              Filter destination NAT connections.

       -j, --any-nat
              Filter any NAT connections.

       -w, --zone
              Filter by conntrack zone. See iptables CT target for more information.

       --tuple-src IP_ADDRESS
              Specify the tuple source address of an expectation.

       --tuple-dst IP_ADDRESS
              Specify the tuple destination address of an expectation.

       --mask-src IP_ADDRESS
              Specify the source address mask of an expectation.

       --mask-dst IP_ADDRESS
              Specify the destination address mask of an expectation.

   PROTOCOL FILTER PARAMETERS
       TCP-specific fields:

       --sport, --orig-port-src PORT
              Source port in original direction

       --dport, --orig-port-dst PORT
              Destination port in original direction

       --reply-port-src PORT
              Source port in reply direction

       --reply-port-dst PORT
              Destination port in reply direction

       --state [NONE | SYN_SENT | SYN_RECV | ESTABLISHED | FIN_WAIT | CLOSE_WAIT | LAST_ACK | TIME_WAIT |  CLOSE
       | LISTEN]
              TCP state

       UDP-specific fields:

       --sport, --orig-port-src PORT
              Source port in original direction

       --dport, --orig-port-dst PORT
              Destination port in original direction

       --reply-port-src PORT
              Source port in reply direction

       --reply-port-dst PORT
              Destination port in reply direction

       ICMP-specific fields:

       --icmp-type TYPE
              ICMP Type. Has to be specified numerically.

       --icmp-code CODE
              ICMP Code. Has to be specified numerically.

       --icmp-id ID
              ICMP Id. Has to be specified numerically (non-mandatory)

       UDPlite-specific fields:

       --sport, --orig-port-src PORT
              Source port in original direction

       --dport, --orig-port-dst PORT
              Destination port in original direction

       --reply-port-src PORT
              Source port in reply direction

       --reply-port-dst PORT
              Destination port in reply direction

       SCTP-specific fields:

       --sport, --orig-port-src PORT
              Source port in original direction

       --dport, --orig-port-dst PORT
              Destination port in original direction

       --reply-port-src PORT
              Source port in reply direction

       --reply-port-dst PORT
              Destination port in reply direction

       --state  [NONE  |  CLOSED  |  COOKIE_WAIT | COOKIE_ECHOED | ESTABLISHED | SHUTDOWN_SENT | SHUTDOWN_RECD |
       SHUTDOWN_ACK_SENT]
              SCTP state

       --orig-vtag value
              Verification tag (32-bits value) in the original direction

       --reply-vtag value
              Verification tag (32-bits value) in the reply direction

       DCCP-specific fields (needs Linux >= 2.6.30):

       --sport, --orig-port-src PORT
              Source port in original direction

       --dport, --orig-port-dst PORT
              Destination port in original direction

       --reply-port-src PORT
              Source port in reply direction

       --reply-port-dst PORT
              Destination port in reply direction

       --state [NONE | REQUEST | RESPOND | PARTOPEN | OPEN | CLOSEREQ | CLOSING | TIMEWAIT]
              DCCP state --role [client | server] Role that the original conntrack tuple is tracking

       GRE-specific fields:

       --srckey, --orig-key-src KEY
              Source key in original direction (in hexadecimal or decimal)

       --dstkey, --orig-key-dst KEY
              Destination key in original direction (in hexadecimal or decimal)

       --reply-key-src KEY
              Source key in reply direction (in hexadecimal or decimal)

       --reply-key-dst KEY
              Destination key in reply direction (in hexadecimal or decimal)

       DIAGNOSTICS
              The exit code is 0 for correct function.  Errors which appear to be caused by invalid command line
              parameters cause an exit code of 2.  Any other errors cause an exit code of 1.

EXAMPLES

       conntrack -L
              Show the connection tracking table in /proc/net/ip_conntrack format

       conntrack -L -o extended
              Show the connection tracking table in /proc/net/nf_conntrack format

       conntrack -L -o xml
              Show the connection tracking table in XML

       conntrack -L -f ipv6 -o extended
              Only dump IPv6 connections in /proc/net/nf_conntrack format

       conntrack -L --src-nat
              Show source NAT connections

       conntrack -E -o timestamp
              Show connection events together with the timestamp

       conntrack -D -s 1.2.3.4
              Delete all flow whose source address is 1.2.3.4

       conntrack -U -s 1.2.3.4 -m 1
              Set connmark to 1 of all the flows whose source address is 1.2.3.4

BUGS

       Please,   report   them  to  netfilter-devel@vger.kernel.org  or  file  a  bug  in  Netfilter's  bugzilla
       (https://bugzilla.netfilter.org).

SEE ALSO

       iptables(8)
       See http://conntrack-tools.netfilter.org

AUTHORS

       Jay Schulist, Patrick McHardy, Harald Welte and Pablo Neira  Ayuso  wrote  the  kernel-level  "ctnetlink"
       interface that is used by the conntrack tool.

       Pablo  Neira  Ayuso wrote and maintain the conntrack tool, Harald Welte added support for conntrack based
       accounting counters.

       Man page written by Harald Welte <laforge@netfilter.org> and Pablo Neira Ayuso <pablo@netfilter.org>.

                                                   Jul 5, 2010                                      CONNTRACK(8)