Marty Adkins wrote: > > > I'm not totally sure what you mean by "from a local ethernet > interface". > If you mean that the router forwarded a packet that arrived on > its > Ethernet interface, and the destination was its serial IP, then > the > packet will definitely *not* leave the router.
As you surmised, this was sourced from the ethernet interface using an extended ping - it did not arrive there from somewhere else. > > OTOH, if the router itself is the source of the packet, and it > pings > its own serial IP, and the outbound interface and layer 2 encap > are > resolved and unambiguous, then the router will launch the packet > out that p2p interface or PVC. I have done exactly what > Priscilla > describes, and not only seen the output from "debug ip icmp" on > the > neighbor router, but also observed it generating ICMP > redirects, since > the packet was forwarded out the interface it arrived on! I too have done what Priscilla tried and did not see the debug output. > > This Cisco aberation is extremely useful for troubleshooting > p2p WAN > links. When the path has been looped (line protocol up > (looped)), the > only IP that is pingable is the directly connected one. That > the router > actually sends the packet makes it possible to test the link > with ping. That, sir, is an excellent thing to remember. I never thought about it, but it sure is useful. Many thanks. > > Now I wasn't performing an extended ping and sourcing the ping > from a > different interface. Maybe that's the difference? I last did > this > with IOS 12.0(7)T. > > Priscilla, I'm not saying what you observed is wrong! I don't > have > access at the moment to replicate it, but I'm positive of what > I saw -- > I had my students do it in class numerous times. > > - Marty > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=53162&t=53148 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
