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MTU adjustment best practices

Posted on 2009-05-13
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Last Modified: 2012-05-06
Need to adjust the MTU on these sites. They have an IPSEc tunnel in between. Should I adjust the MTU on the inside interface or outside interface?

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Question by:dissolved
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lanboyo earned 2000 total points
ID: 24376755
Well, you can reduce the mtu of the inside interfaces facing the facing the hosts, and if you run a tunnel within the ipsec .

You can not disable "ip unreachables" if you want this to do any good. You need to do this on both sides of the network...

The command  "ip tcp adjust-mss"  on the external interfaces of the routers that have the ipsec tunnel on them will also help servers with PMTU issues.

This does not help with udp ...

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by:lanboyo
ID: 24376835
You really need to lower the MTUs of the workstations on the network.
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