|The Netscreen Proxy ID problem|
|Firewalls - Netscreen|
|Tuesday, 18 May 2010 00:00|
A proxy-ID is used during phase 2 of Internet Key Exchange (IKE) Virtual Private Network (VPN) negotiations. Both ends of a VPN tunnel either have a proxy-ID manually configured (route-based VPN), or simply use a combination of source IP, destination IP and service in a tunnel policy. When phase 2 of IKE is negotiated, each end compares the configured local and remote proxy-ID with what is actually received.
There are a number of problems that you may face when creating Site to Site VPNs on a Netscreen Firewall. Which is in the way it announces its Proxy ID`s.
Below shows you the different combination's and the resulting Proxy ID`s for a policy being used for a policy based VPN.
How should it be configured ?
Below shows you the ways for configuring both a Policy and Route based VPN when using multiple subnets.
Multiple Subnets for a Policy VPN
1) Within 'VPNs / AutoKey IKE / [Your VPN Tunnel] / Advanced' ensure that Proxy ID option is not ticked.
Multiple Subnets for a Route Based VPN
To use multiple subnets you will need to bind multiple Phase 2 Policies (AutoKey IKE Tunnels) to your Tunnel Interface.
1) Within 'VPNs | AutoKey IKE | [Your VPN Tunnel] | New | Advanced' :
Please Note : When a proxy ID of 0.0.0.0/0.0.0.0 is used there is only one SA which is created for all the traffic.
New to ScreenOS 6.3 is Multiple Proxy ID support on Route-Based VPNs. Details on this can be found here.
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