IPSec ov UDP: what ports to open, please

Unanswered Question
Feb 27th, 2008

I'm trying to run the Cisco VPN client v4.8 through a Cisco 831 router. Can anyone tell me what ports should be open?

I have this problem too.
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JORGE RODRIGUEZ Wed, 02/27/2008 - 19:16

If you are initiating vpn client connectivity from behind the 831 to outside you need to allow through the IPsec ports udp 500, udp 4500 and protocol 50 esp.

e.g

access-list 101 permit udp any any eq 500 log

access-list 101 permit udp any any eq 4500 log

access-list 101 permit esp any any log

apply acl-101 to your outbound interface

ip access-group 101 in

Rgds

Jorge

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