Priscilla Oppenheimer wrote: > > Don't believe everything you read. ;-) This statement from the > Cisco document is not believable: > > "Pings to your own interface address are successful on > point-to-point subinterfaces or high-level data link control > (HDLC) links because the router on the other side of the link > returns the ICMP echo and echo reply packets. The same > principle applies with multipoint (sub)interfaces. To > successfully ping your own interface address, another router > must send back the ICMP echoes and the echo replies."
Agreed - don't believe everything you read. I came to accept this out of the possibly false memory that someone I respected had explained why it really was true. In any case, I had two more thoughts on the journey home tonight. The distant-end router may not report any ICMP debug because it is simply routing packets - it isn't "participating" in that particular ICMP process. My other though, which is probably a much better one, is that a poor man's protocol analyzer could probably come pretty close to settling the issue. If I had a lab, which I don't at this exact moment (need to work on that in the next few days), I'd build an access list on the far-end router to block any traffic from that ethernet interface and see what happens. I might look at the idiot lights too. Although, neither of these are as 100% fool-proof as that WAN protocol analyzer. And now that you mention it...I have seen some pretty wild EIGRP white papers in the past. OSPF too. Scott > > I think they are trying to address the issue of not being able > to ping yourself on Frame Relay. That is fixable by including a > map statement. This shouldn't imply that the packets actually > cross the serial link though, even though that's what they are > saying. And to claim that the echos (not just the echo replies) > get sent back is really not believable. > > On the other hand, sometimes things that aren't believable turn > out to be true in the Cisco world. But this one really smacks > of a being written by someone who is slightly clueless. > > Hey, ask Chuck about that weird EIGRP paper that comes up every > so often. It's even more unbelievable than this one. ;-) > > Priscilla > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=53160&t=53148 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
