»Setting up Cisco 2514 as DSL Firewall
Keep in mind that Ethernet ports (Ethernet interfaces) of any 2500 series router are the AUI ports, NOT the RJ-45 ports. The RJ-45 ports are for CONSOLE and AUX (Auxilary) access which are for totally different situation. This is where the AUI/Ethernet transcievers come in handy.
You may also need the latest IOS and the maximum size of DRAM and flash memory (16/16 MB). It is suggested to always max out the DRAM and flash memory size before installing latest IOS. This way there should be no encounter problem of insufficient memory space.
»ssh configuration help