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?