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IPSEC_TNCFG(5)                    27 Jun 2000                   IPSEC_TNCFG(5)



NAME
       ipsec_tncfg - lists IPSEC virtual interfaces attached to real
       interfaces

SYNOPSIS
       ipsec tncfg
              cat/proc/net/ipsec_tncfg

OBSOLETE
       Note that tncfg is only supported on the classic KLIPS stack. It is not
       supported on any other stack and will be completely removed in future
       versions. A replacement command still needs to be designed

DESCRIPTION
       /proc/net/ipsec_tncfg is a read-only file which lists which IPSEC
       virtual interfaces are attached to which real interfaces, through which
       packets will be forwarded once processed by IPSEC.

       Each line lists one ipsec I/F. A table entry consists of:

       +      an ipsec virtual I/F name

       +      a visual and machine parsable separator '->', separating the
              virtual I/F and the physical I/F,

       +      a physical I/F name, to which the ipsec virtual I/F is attached
              or NULL if it is not attached,

       +      the keyword mtu=,

       +      the MTU of the ipsec virtual I/F,

       +      the automatically adjusted effective MTU for PMTU discovery, in
              brackets,

       +      a visual and machine parsable separator '->', separating the
              virtual I/F MTU and the physical I/F MTU,

       +      the MTU of the attached physical I/F.

EXAMPLES
       ipsec2 ->> eth3 mtu=16260(1443) ->> 1500

       shows that virtual device ipsec2 with an MTU of 16260 is connected to
       physical device eth3 with an MTU of 1500 and that the effective MTU as
       a result of PMTU discovery has been automatically set to 1443.

       ipsec0 ->> wvlan0 mtu=1400(16260) ->> 1500

       shows that virtual device ipsec0 with an MTU of 1400 is connected to
       physical device wvlan0 with an MTU of 1500 and no PMTU packets have
       gotten far enough to bump down the effective MTU from its default of
       16260.

       ipsec3 ->> NULL mtu=0(0) ->> 0

       shows that virtual device ipsec3 is not connected to any physical
       device.

FILES
       /proc/net/ipsec_tncfg, /usr/bin/ipsec

SEE ALSO
       ipsec(8), ipsec_manual(8), ipsec_eroute(5), ipsec_spi(5),
       ipsec_spigrp(5), ipsec_klipsdebug(5), ipsec_tncfg(8), ipsec_version(5),
       ipsec_pf_key(5)

HISTORY
       Written for the Linux FreeS/WAN project <[1]http://www.freeswan.org/>
       by Richard Guy Briggs.

REFERENCES
       1. http://www.freeswan.org/
          http://www.freeswan.org/



27 Jun 2000                       11/23/2006                    IPSEC_TNCFG(5)