Monday, January 14, 2013

iPad/iPhone AnyConnect VPN wrong MTU size

Someone recommended I should ask the same question here. This is the original question on Apple: http://apple.stackexchange.com/questions/47919/ipad-iphone-anyconnect-vpn-wrong-mtu-size

I try to connect with a iPad (iOS 5.1) and the AnyConnect app to connect to a OpenVPN server on a Debian server. But this warning always appears in the OpenVPN log:

WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1560 -- please ensure that --tun-mtu or --link-mtu is equal on both peers

On the server side the tun interface mtu size is 1500 bytes. I can connect with other clients (pcs, macs, ...) to the server. But with a iPad or iPhone client this warning appears and no connection is established.

How can I fix this?

Br

Source: http://serverfault.com/questions/466447/ipad-iphone-anyconnect-vpn-wrong-mtu-size

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