So you want to upgrade your Cisco 3620 but you don't have an available ethernet port? You can do it the slow way via console connection or you can get a little clever, depending on what modules you have. For me, I needed to upgrade my router to the last and final supported version of 12.3(26) ...

While playing with my simulated serial WAN link. I thought I could simulate the link going down by turning off keepalives on one of the serial interfaces. After waiting 5, 10 minutes and still being able to ping across, I decided to turn off the other keepalive coming from the other switch! Low and behold, the ...