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NHRP (Next Hop Resolution Protocol).
A way of finding addresses on a non-broadcast, multi-access link-layer. This means that many people share the same local network, but you can't broadcast to everyone. Remember that most of our networking is designed around Ethernet, where in order to find your router, you simply broadcast out an ARP request.An example of such layers are ATM, SMDS, Frame Relay, and X.25. Note that these packets are intended only for the local link, and should not be routed across the Internet.
Cable Modems
Cable modem networks usually are based upon an ATM backend. You will sometimes see NHRP on these networks from your next-hop routers.
Routers
Your routers may be supporting this. I've heard that sometimes you'll see these frames sent to the multicast address of 224.0.0.5 (which is assigned to OSPF).
Firewall Logs
Some firewalls have bugs that spit out spurious information about port numbers. You will see sometimes information about port 2048 or port 65535. This information is meaningless, because this protocol doesn't have "ports".