Sharing Internet for Redundancy
Date Posted: September 01, 2008 04:06 PM
Author: Mel Beckman
Dear Doctor, A neighboring company with a high-speed Internet connection similar to ours, but from a different provider, has proposed that we pool our resources so that one company's connection can support the other company should it lose Internet access. A Cat-5 cable already interconnects our two data centers. I've found a number of firewalls that support dual-WAN configuration, so we bought a pair and paid for a fiber optic cable between our buildings. Alas, I can't figure out how to interconnect the two firewalls so that they fail over correctly. Each has its own WAN IP address, and connecting the four WAN ports in a common switch (one at each location) results in "IP address spoof" error messages, and failover doesn't work. How can we disable these errors in our firewalls and get them to fail over correctly?

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