So I have a 4431 router connected to an HP 5412 switch(Layer 2 only), and the HP is connected to a pair of Nexus 9k via a port channel. The 4431 can ping the Nexus, and has a default route going through the Nexus IP address. Other devices on the same subnet as the 4431 work perfectly.
The 4431 can also ping other IP addresses on the Nexuses that aren't on the same subnet, but can't ping devices on those subnets.
Any ideas on what could be causing this? This was all working yesterday, and no changes were made.
This almost feels like the router is sending all traffic out with a TTL of 1. But again, no changes were made, and there is no TTL command. Is there an easy way to test this TTL theory or and other angles I should troubleshoot this from?
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