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- Fault Tolerant Router is a daemon, running in background on a Linux router or firewall, monitoring the state of multiple internet uplinks/providers and changing the routing accordingly. LAN/DMZ internet traffic (outgoing connections) is load balanced between the uplinks using Linux *multipath routing*. The daemon monitors the state of the uplinks by routinely pinging well known IP addresses (Google Public DNS servers, etc.) through each outgoing interface: once an uplink goes down, it is excluded from the *multipath routing*, when it comes back up, it is included again. All of the routing changes are notified to the administrator by email.