You better send your configs. It sounds like the Core router is learning about Router A somehow even though you say there's no default route.
Also, put Ethereal on it and see what's really happening. When the Core PC sends a ping or traceroute, does it really send to the MAC address of the Core router? Does the Core router send an ICMP Redirect and also forward the frame to RouterA? Some of this would be really easy to see with Ethereal. Priscilla Lo Ching wrote: > > Dear All, > > I have a CORE network with /16,eg, 10.10.10.0/16 and a seperate > segment with ip 10.10.20.0/24 with a router. > ie > segment/24 -- routerA --- CORE LAN/16 ---- CORE router > > All the CORE PC with default gateway pointing to CORE router > and segment PC will point to routerA. > > Here is the my question. > Router A have a default route pointing to CORE router. However, > I check that the CORE router doesn't have a route pointing > back. ie, > NO ip route 10.10.20.0/24 to routerA. Therefore, I assume that > the CORE router don't know how to route the traffic back. > > But how come the CORE LAN PC and segment PC can ping another? > > And why traceroute from CORE LAN PC the first hop will redirect > to routerA interface? (because of ip-redirect?) > > TIA. > > rgds, > LoChing Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=70209&t=70175 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
