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New Member

VPN between Cisco Router and Netscreen Firewall


I have a question and I hope somebody can help me.

We try to build up a VPN connection between a Cisco1720 router running 12.0(7) T IOS and a Netscreen25 firewall. We´re using pre-shared keys and DES encryption.

Building up the connection from the router to the firewall is o.k. The IPSEC-tunnel comes up and the data is encrypted.

But building up the connection from the firewall to the router doesn´t work. There we have problems with the proposals.

We checked the configurations several times and cannot find errors.

Has someone an idea how get this working or it is just impossible due to technical problems to build this up ?




Re: VPN between Cisco Router and Netscreen Firewall

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

New Member

Re: VPN between Cisco Router and Netscreen Firewall

Hi i have been working on a similar project it is not that hard, i have a pdf file that shows your step by step. but not sure how to attach it?

Not sure what a netscreen 25 is but this work's with 100's



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