On Thu, Oct 17, 2002 at 10:31:12AM -0400, Darrell Carley <darrell@national-net.com> wrote:
I am trying to troubleshoot a latency issue for some of our networks, and was wondering about this.Knowing that routing isn't always symmetrical, is it possible for a traceroute to traverse a different reverse path, than the path that it took to get there? .or will it provide a trace of the path the packet took to reach the destination? According to definition, is should take the same path, but are there any other cases that I should be aware of?
Something else to be aware of is the effect of ECMP on traceroutes--where the source/dest IP (among other hash inputs) can impact which of several parallel equal cost paths you take thru a backbone. ECMP is fairly common, so I would suspect a fairly large percentage of paths are subject to it. -Lane
Darrell