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.

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