Using VRF (Virtual Routing and Forwarding) on Linux

It isn&rsquo;t uncommon on linux systems to have muliple (layer 3, i.e. with IP addresses, not counting the loopback device) network interfaces. For example your main interface (with the default route) and a docker bridge. Or you run a firewall between a public network and one or many internal networks (perhaps as tagged VLAN interfaces). But in rather rare scenarios you need multiple default…