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PPTP Static NAT

hi all,

i was asked to open up certain ports for a VPN connection. i found useful links below but still can't figure out how to perform static NAT for GRE (port 47) and ESP (port 50).

https://supportforums.cisco.com/message/3349580#3349580

https://supportforums.cisco.com/message/3276936#3276936

could someone advise which config should i use:

ip nat inside source static tcp 192.168.1.2 1723 203.X.X.132 1723 extendable

ip nat inside source static esp 192.168.1.2 47 203.X.X.132 47 extendable

ip nat inside source static esp 192.168.1.2 50 203.X.X.132 50 extendable

OR

ip nat inside source static tcp 192.168.1.2 47 203.X.X.132 47 extendable

ip nat inside source static tcp 192.168.1.2 50 203.X.X.132 50 extendable

ip nat inside source static udp 192.168.1.2 47 203.X.X.132 47 extendable

ip nat inside source static udp 192.168.1.2 50 203.X.X.132 50 extendable

i've ended up doing the below config line while searching for a proper way to do this. thanks in advance!

Router(config)#ip nat inside source static 192.168.1.2 203.X.X.132 extendable

Everyone's tags (4)
3 REPLIES

Re: PPTP Static NAT

Hi Andrew,

Thanks for the links! I already know how to setup TCP port 1723 for static NAT but how about ports 47 and 50?

Sent from Cisco Technical Support iPhone App

Re: PPTP Static NAT

Here is the thing GRE and ESP are Protocols. GRE is 47, ESP is 50, IPv4 is 4, ICMP is 1 so as you can see you cannot translate a protocol in the TCP/UDP prt sense.

Sent from Cisco Technical Support iPad App

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