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New Member

VPN connection problem

Hi everyone,

I connect a Draytek router to Cisco router using VDPN. I have run "debug crypto isakmp" on our Cisco router. The SA was authenticated but the connection wasn't established. The show crypto session said the connection was DOWN-NEGOTIATING.

Do you know why it doesn't establish the connection?

Thank you very much.

Triet

6 REPLIES
Anonymous
N/A

Re: VPN connection problem

Make sure that crypto map which allows the interesting traffic is configured right and applied to the appropriate outgoing interface to bring the tunnel up.

New Member

Re: VPN connection problem

Thanks Pengke11, I can confirm the settings are correct.

Silver

Re: VPN connection problem

Do you have port open 4500 i.e. for NAT-T??

Thanks,

Dharmesh

New Member

Re: VPN connection problem

Dharmesh, thank you for your reply.

No I don't have port 4500 open. Why does it need to be opened?

Best regards,

Triet

New Member

Re: VPN connection problem

Yes I already have port NAT-T open, just didn't realise that "non500-isakmp" is actually 4500.

New Member

Re: VPN connection problem

Hi again,

I have finally had the VPN working between a Draytek and a Cisco router. Both on dynamic IP. I wrote down as a blog, check it out if you need to:

http://trietgiang.blogspot.com/2008/04/dialin-vpn-from-draytek-to-cisco.html

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