[Openswan Users] mtu problems

James Muir muir.james.a at gmail.com
Fri Jan 2 21:22:56 EST 2009

James Muir wrote:
> Is there something analogous to overridemtu= that I can set with NETKEY? 
>   I have tried changing the MTU value on eth0 using ifconfig, but that 
> did not seem to help.

any hints on this one?  If I knew where the mtu was set in the openswan 
code, I could try recompiling with a hard coded value...

I am anticipating that someone will say use KLIPS rather than NETKEY :-(

incidentally, the KLIPS module fails to build on my machine (kernel 
2.6.24, openswan 2.6.19):

make[2]: Entering directory `/usr/src/linux-source-2.6.24'

   WARNING: Symbol version dump /usr/src/linux-source-2.6.24/Module.symvers
            is missing; modules will have no dependencies and modversions.

ln -s -f /scratch/openswan-2.6.19/linux/net/ipsec/ipsec_init.c 
   CC [M]  /scratch/openswan-2.6.19/modobj26/ipsec_init.o
In file included from /scratch/openswan-2.6.19/modobj26/ipsec_init.c:57:
include/net/ip.h: In function ‘ip_hdrlen’:
include/net/ip.h:49: error: ‘const struct sk_buff’ has no member named ‘nh’


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