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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
     traffic 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 11.0-PRERELEASE         August 1, 2007         FreeBSD 11.0-PRERELEASE
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO

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<https://www.freebsd.org/cgi/man.cgi?query=enc&sektion=4&manpath=FreeBSD+7.0-RELEASE>

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