Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Concentrator 3005 ports for router

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

1 REPLY
New Member

Re: Concentrator 3005 ports for router

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

228
Views
0
Helpful
1
Replies