With the increasing popularity of IPSec VPN deployments on the Internet, there is often a need to understand the exact IPSec and other tunnel encapsulation overhead in order to determine the fragmentation boundary conditions for optimal MTU/MSS tunin...

IntroductionThis document describes the issue on a Cisco IOS® router when Secure Shell (SSH) to the router sometimes fails with a reported user authentication failure in the SSH debugs. This issue occurs even though the user credentials entered are c...

SummaryWith Netflow enabled on an IOS router that also has IPSec configured, there is a known issue where the Netflow export packets to the collector may not get encrypted on the sending IPSec endpoint, even though the flow matches the IPSec encrypti...