Get rid Cisco IOS router message: %FW-4-TCP_OoO_SEG: Dropping TCP Segment

Some times you will see on a Cisco IOS router the following message in your show logging: 009357: Jul 8 09:28:22.214 CDT: %FW-4-TCP_OoO_SEG: Dropping TCP Segment: seq:104330552 1492 bytes is out-of-order; expected seq:104304632. Reason: TCP reassembly queue overflow – session <internal host>:1535 to <external host>:80 This message can be very annoying if you see it.…

ISP Failover Cisco IOS Router

Cisco ISP Failover IOS Router. Today I figured out I had a problem.  With a tracking on the router with 2 ISP connections. After some trouble shooting I found the problem. And fixed it with the configuration below. Number of the track.  So you can see which track is related to the default route. track 10 ip…

One-time passwords on Cisco routers

One-time passwords on Cisco routers Cisco routers preconfigured for SDM have default username/password cisco/cisco. As many users forget to disable or change the default username after configuring their router with SDM, they could end up with an exposed router. Cisco has patched this vulnerability in IOS release 12.4(11)T that includes the one-time password/secret option of…