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ENC(4)		       FreeBSD Kernel Interfaces Manual			ENC(4)

NAME
     enc -- Encapsulating Interface

SYNOPSIS
     To	compile	this driver into the kernel, place the following line in your
     kernel configuration file:

	   device enc

DESCRIPTION
     The enc interface is a software loopback mechanism	that allows hosts or
     firewalls to filter ipsec(4) traffic using	any firewall package that
     hooks in via the pfil(9) framework.

     The enc interface allows an administrator to see outgoing packets before
     they have been processed by ipsec(4), or incoming packets after they have
     been similarly processed, via tcpdump(1).

     The ``enc0'' interface inherits all IPsec traffic.	 Thus all IPsec	traf-
     fic can be	filtered based on ``enc0'', and	all IPsec traffic could	be
     seen by invoking tcpdump(1) on the	``enc0'' interface.

EXAMPLES
     To	see all	outgoing packets before	they have been processed via ipsec(4),
     or	all incoming packets after they	have been similarly processed:

	   tcpdump -i enc0

SEE ALSO
     tcpdump(1), bpf(4), ipf(4), ipfw(4), ipsec(4), pf(4), tcpdump(8)

FreeBSD	9.2			August 1, 2007			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=enc&sektion=4&manpath=FreeBSD+7.0-RELEASE>

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