We have a client that manages their own MPLS network with many sites, one of which terminates at a Cisco router in our data center (owned/managed by client). From there it connects to our ASA and then into a server environment. A few weeks ago we started receiving ICMP packets from one of their routers with message text "Dest Unreach - Fragmentation Needed". They have stated that their MTU is set to 1400 all the way through; this interface on our ASA is (and always has been) configured to 1500 for MTU. The router that is sending the ICMP to us is the one at their site, not the LSR or LER. My assumption is that if we are receiving the fragmentation request at our edge than the issue has to be with the LSR or LER... is that correct or could we be missing something in our infrastructure?
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