I'm trying to bridge a VLan using L2TPV3 over IPSEC.
Everything is working properly when the computers have an MTU manually lowered to 1300. But it doesn't work for computers with default MTU.
The show L2tp session all shows no packets being dropped because of MTU so it seems that it is the IPSEC encapsulation that is making the packets too big.
I've tried using IP TCP ADJUST-MSS as well as lowering the MTU on the router interfaces but it doesn't help.
Cisco bug CSCek46765 mention a problem with LT2PV3 over GRE which could be the one I'm hitting here but the workaround of using IP MTU 1538 doesn't work for me as loopback interfaces can't be set with an MTU that big.
Is anybody successfully running LT2PV3 over IPSEC. What did you do to fix the MTU issue?
Removing that command will mean that you will see fragmentation - meaning traffic will get process-switched leading to high CPU load on your device. Did you ever experience this? If so did you solve the problem another way?
I ask because we see the same problem. We need 'ip pmtu' to stop CPU problems but at the same time we can't have it because it breaks some servers! Catch-22.
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