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[Problem] Setup GRE VPN tunnel between 2 cisco routers behind ISA2004

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[Problem] Setup GRE VPN tunnel between 2 cisco routers ... - 29.Nov.2006 11:01:51 PM

thomaslam12

Posts: 1
Joined: 24.Nov.2006
Status: offline

Dear ALL,

My company needs to setup a GRE VPN tunnel between 2 Cisco routers. One of the routers (local router) is placed behind ISA2004. The IP of this router is 10.0.0.1.

I have already set a outbound (local router --> ISA2004 --> remote router) rule for the GRE VPN tunnel. But i don't know how to set the inbound (remote router --> ISA2004 --> local router) rule for the GRE VPN tunnel.

I would like to ask how to set rules on ISA2004 to allow the inbound traffic for the following ports?

IPSEC Authentication Header Protocol - Protocol Number 51
GRE - Generic Routing Encapsulation - Protocol Number 47
ESP - IPSEC Encapsulating Security Payload Protocol - Protocol Number 50
IKE - IPSEC Internet Key Exchange Protocol (formerly ISAKMP/Oakley) - UDP Port 500

Thanks a lot