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on centos 6 there are open source implantations of L2TP VPN (e.g xl2tp), i wanna know that if default l2tp vpn port blocked can we run vpn on different ports or maybe change cipher setting ? what about client (mac) ?

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PPTP _ no chance. Especially because - the TRAFFIC (not the control) is not using a port but not even UDP or TCP, but IP supprotocol 47, GRE. L2TP uses the same, I Think. So, changing the port (of the control channel) would not achieve a lot. Noone pretty much needs this. –  TomTom Dec 29 '12 at 16:12
    
damn ! ISP blocked l2tp port and openvpn handshake –  lary Dec 29 '12 at 16:48
    
Well, then a port Change wont help, as you can not Change the GRE part. SSL / SSTP is the only solution. OpenVPN over TCP with other port. –  TomTom Dec 29 '12 at 17:48

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