When your computer or server has access to multiple LAN segments with different address spaces and different gateways to the Internet, there’s a nice feature called policy routing that allows you to use all of them simultaneously without having to re-configure your network topology. This is especially useful when you want to increase the bandwidth and resilience of a single computer or server without the burden of being an Autonomous System (BGP peering, Internet Registry bureaucracy, etc.).

Here are the steps to setup multiple uplinks through policy routing on Gentoo:

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