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Community Member

mss on interface

Hello everybody,

snenario:

inside --- PIX 535 6.3(3)UR --- outside with ipsec tunnel endpoint

traffic from inside to outside was restricted to mss=1460. After configuring the tunnel it's now mss=1380, also for traffic not going into the tunnel. The tunnel seems to lower the mss by 80 bytes.

mtu is still set to default 1500 on all interfaces. Is it possible to get non-tunnel-traffic back to mss=1460 bytes?

Many thanks for all kinds of help

Uli

1 REPLY
Community Member

Re: mss on interface

Try changing the value using the command sysopt connection tcpmss.

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