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NAT, multi-homed, VPN

Client has 2 backbone connections. Adding a PIX to one WAN link; PIX will terminate a VPN from a remote 831.

Client wants to add a load balancing appliance to add fault tolerance to outbound traffic (understands if PIX's WAN is down, VPN will be down).

Initial approach would be to make a small non-public (ie subnet between the LAN ports of PIX and router on other WAN to the WAN ports of the load balancer. Load balancer would be gateway of office LAN ( Remote office (homed by the 831) would be on

Assuming PIX's ACL would need to consider and interesting VPN traffic on the.

DOes anybody see a problem with routing VPN traffic between the and LANs?

Thank you all in advance

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