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Is there any VPN which is compatible with iPhone/iPad and works WITHOUT GRE protocol (my router not support GRE)

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You willing to jailbreak? – Zoredache Mar 8 '11 at 18:31

Check out Apple KB article HT1288. Cisco IPSec, Juniper Junos Pulse, Cisco AnyConnect and L2TP/IPSec VPNs are supported either within the iOS or via third party apps in the app store. See if you can set up an IPSec/L2TP VPN behind your router. This excellent and detailed thread at shows how a fellow created an L2TP IPSec VPN on an Ubuntu box for his iPhone to connect to.

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I found, that L2TP works very nice and require only few UDP ports.

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