Concentrator 3005 ports for router

kitprice1 · ‎09-18-2007

Hello to ALL,

Something got screwed up here. I need to know which ports should be open on a router that is in front of the concentrator ? ? ?

UDP 4500

TCP 10000

Are these right ?

Please help, thank you

fembsen · ‎09-20-2007

Hi,

IPSec uses the ESP IP protocol (not port) and UDP port 500 (isakmp) and might use the AH IP protocol.

If you use Nat-T then you need UDP port 500 (isakmp) and UDP port 4500 (originally UDP port 10000). With Nat-T there is no need for the ESP and AH protocols.

Regards, Frank