I have 2 T1 connection to branch offices coming in to my router: IOS (tm) 3600 Software (C3640-I-M), Version 12.2(21), RELEASE SOFTWARE (fc3)
the routers on both branch offices are also 3600.
I have a 2600 router that I want to use in the main office to replace the 3600: IOS (tm) C2600 Software (C2600-I-M), Version 12.1(5)T7, RELEASE SOFTWARE (fc1)
did all the configuration and connected the new router to my LAN - all works perfect.
then I switched the connections on both T1s to the new router and could ping the routers on both branch offices (I see it as L2+L3 working)
now here is my problem: I can't access any device beyond the routers, both when accessing from the new 2600 to each branch office or other way.
everything look ok and obviously there is something I'm missing - either a configuration or incompatibility of the 2600 IOS.
I hope to get a clue...