Hi,
This message informs you that the IP packet fragments arriving from the host 203.18.137.116 are overlapping, i.e. if the packet was to be put back together, parts of it would overlap and overwrite each other. The VFR (Virtual Fragmentation and Reassembly) is a feature on Cisco routers that keeps track of fragmented packets so that they can pass ACL checks as if they were unfragmented.
Overlapping fragments are most often caused by malicious intents, as correct IP packet fragmentation will never produce overlapping fragments. You can assume that either the 203.18.137.116 is intentionally creating a stream of overlapping fragments to confuse and/or interfere with the correct operation of the 99.88.45.237 (and routers/firewalls inbetween), or some device on the route between these two hosts has a faulty IP driver that creates overlapping fragments.
In any case, there is nothing you can do about it. It is not your fault, and the router is merely informing you about a suspicious flow of IP packets.
Best regards,
Peter
