Cisco Access Point blocking PPTP

Vienna: 10. August 2011

Problem: A network of some Cisco Access Points AIR-AP1142N-E-K9 connected to an small router works good as expected but when the user tries to connect to en PPTP VPN the connection fails with a time-out.

Solution: it was no NAT problem in this case (I fixed this before). Cisco IOS 12.4(21)?? has officially a bug not sending GRE (Proto:47) packets from the network to the client. IOS Version 12.4(25d)JA fixed this bug.

Strange! An access point in bridging mode filters depending on protocol numbers. So I guess it’s not really a bridge that Cisco implemented in this IOS device.

Hello world

My daily job is solving IT problems. No matter if they are hardware/software, or os/configuration/application related. There is always a bug to be fixed.

And: AlexT Debugs

This blog will be the place to remember some solutions to problems, because as time goes by it’s sometimes hard to remember how I debugged. Some solutions will be public, if I think others could be interested.