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Cisco 2500 series VPN

Unanswered Question
Feb 14th, 2002
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Hi,

does anyone know how to configure a cisco router to enable a VPN session(IPSEC?) from a Sonicwall Client VPN from Internet to pass through. I'm using a Cisco 2500 series leased-line router with IOS 11.3 with IOS firewall. What must I include in the Access-list? What must be in the ip inpsect rule?


Thank you.


Regards,

Gim Siong

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Gilles Dufour Thu, 02/21/2002 - 20:40
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  • Cisco Employee,

ipsec uses isakmp/ike to negotiate the paramaters.

This protocol (IKE) uses udp port 500 (for src and destination).


IPSEC is actually the combination of 2 thinkgs.

ESP and AH.

ESP uses the IP protocol number 50 and AH uses 51.


so your firewall should permit these ports/protocols.

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