NAME

       nfct - command line tool to configure with the connection tracking system

SYNOPSIS

       nfct command subsystem [parameters]

DESCRIPTION

       nfct is the command line tool that allows you to configure the Connection Tracking System.

COMMANDS

       list   List the existing objects.

       add    Add new object.

       delete Delete an object.

       get    Get an existing object.

       flush  Flush the accounting object table.

       disable
              This  command  is  for  the  helper  subsystem. It allows you to disable enqueueing
              packets to userspace for helper inspection.

       default-set
              This command is for the timeout subsystem. It allows you to  set  default  protocol
              timeouts.

       default-get
              This  command  is  for  the  timeout  subsystem.  It  allows you to get the default
              protocol timeouts.

SUBSYS

       By the time this manpage has been  written,  the  supported  subsystems  are  timeout  and
       helper.

       timeout
              The timeout subsystem allows you to define fine-grain timeout policies.

       helper The helper subsystem allows you to configure userspace helpers.

       version
              Displays the version information.

       help   Displays the help message.

EXAMPLE

       nfct add timeout test-tcp inet tcp established 100 close 10 close_wait 10

       This  creates  a  timeout  policy  for tcp using 100 seconds for the ESTABLISHED state, 10
       seconds for CLOSE state and 10 seconds for the CLOSE_WAIT state.

       Then, you can attach the timeout policy with the iptables CT target:

       iptables -I PREROUTING -t raw -p tcp -j CT --timeout test-tcp

       iptables -I OUTPUT -t raw -p tcp -j CT --timeout test-tcp

       You can test that the timeout policy with:

       conntrack -E -p tcp

       It should display:

       [UPDATE] tcp 6 100 ESTABLISHED  src=192.168.39.100  dst=57.126.1.20  sport=56463  dport=80
       src=57.126.1.20 dst=192.168.39.100 sport=80 dport=56463 [ASSURED]

SEE ALSO

       iptables(8),conntrack(8)

BUGS

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

AUTHORS

       Pablo Neira Ayuso wrote and maintains the nfct tool.

       Man page written by Pablo Neira Ayuso <pablo@netfilter.org>.

                                           Feb 29, 2012                                   NFCT(8)