I'll have a stab..... If you're using routes to the interface (which I guess you must be) rather than the next hop
(IP ROUTE 10.0.0.0 255.0.0.0 Serial 0) then I would imagine that the router is not too bothered about the next hop address, it just shoves the data on the line and the other end will pick it up. Same both ways, because it's just a point to point link. Can you get it to actually ping the opposite serial interface? Can't decide in my head if that should work. I take it if you can, there must be routes as above? Haven't got any routers with me to play with. Gaz ""Constantin Tivig"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Here are 2 routers linked by a point to point hdlc serial line. > > We have 10.1.1.1/8 at routerA and 192.168.1.1/24 at routerB. > > Seems it works. Why ? > > The same story w/ different subnet address assigned to the edges of a tunnel > (by specifying ip unnumbered from Fa ) > > Constantin Tivig Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=34744&t=34741 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]

