What ports for IPSec through firewall?

[Randall White]

Hi All,

I'm setting up an IOS VPN tunnel to a router inside a Brand X firewall. What ports do I need to open for IPSec and IKE? Any links that discuss this would be appreciated.

Thanks, Randy

[ywadhavk]

You need to open up the below;

IKe -- udp 500

ESP -- protocol 50

AH -- protocol 51

Thanks,

yatin

[pcomeaux]

Hi Randy -

Here is a link - IOS to IOS ipsec tunnel through a firewall with NAT.

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a008009486e.shtml

peter