10-13-2011
Quote:
Originally Posted by
Corona688
This bug happened in kernels from 2008 or so. IPv6 transmissions would get their MTU from the wrong interface, I think the loopback.
This one?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/254622
I'm using the latest Centos Kernel (2.6.32-71.29.1.el6.i686), I'd hope a fix from 2008 would be included in that...
Tried reducing the MTU for lo but made no difference.
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LEARN ABOUT DEBIAN
ipsec_tncfg
IPSEC_TNCFG(5) [FIXME: manual] 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/local/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 <http://www.freeswan.org/> by Richard Guy Briggs.
[FIXME: source] 10/06/2010 IPSEC_TNCFG(5)