Concentrator 3005 ports for router

Unanswered Question
Sep 18th, 2007
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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

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fembsen Thu, 09/20/2007 - 02:27
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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



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