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Manual for tncfg - man 5 tncfg

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IPSEC_TNCFG(5)                                                  IPSEC_TNCFG(5)



NAME
       ipsec_tncfg  -  lists  IPSEC virtual(5,8) interfaces attached to real inter-
       faces

SYNOPSIS
       ipsec(5,8) tncfg(5,8)

       cat /proc(5,n)/net/ipsec_tncfg

DESCRIPTION
       /proc(5,n)/net/ipsec_tncfg is a read-only file(1,n) which lists which IPSEC  vir-
       tual(5,8)  interfaces  are  attached to which real interfaces, through which
       packets will be forwarded once processed by IPSEC.

       Each line lists one ipsec(5,8) I/F.  A table entry consists of:

       +  an ipsec(5,8) virtual(5,8) I/F name

       +  a visual and machine parsable separator '->', separating the virtual(5,8)
          I/F and the physical I/F,

       +  a  physical  I/F name, to which the ipsec(5,8) virtual(5,8) I/F is attached or
          NULL if(3,n) it is not attached,

       +  the keyword mtu=,

       +  the MTU of the ipsec(5,8) virtual(5,8) I/F,

       +  the automatically adjusted effective  MTU  for  PMTU  discovery,  in(1,8)
          brackets,

       +  a visual and machine parsable separator '->', separating the virtual(5,8)
          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(5,8) 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(7,n,1 builtins) to 1443.

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

       shows that virtual(5,8) 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(5,8)  device  ipsec3  is  not connected to any physical
       device.


FILES
       /proc(5,n)/net/ipsec_tncfg, /usr/local/bin/ipsec(5,8)

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

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



                                  27 Jun 2000                   IPSEC_TNCFG(5)

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