IPSEC MTU size should be 1500 or 1400 with ipsec 60 overhead?

Unanswered Question
Feb 20th, 2007

Our l2l vpn connections have different MTU sizes. The VPn connection is established but I only get inbound traffice but no outbound traffic. Should the path mtu be 1400 or 150 for the VPN?

1400, ipsec overhead 60, media mtu 1500

I have this problem too.
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hoogen_82 Tue, 02/20/2007 - 11:17

Just keep pinging the other end ip address with ping x.x.x.x -f -l 1500.

Keep decreasing it untill you get replies back. The time you get reply is probably the MTU you would want to use.

HTH

Hoogen

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