IP Routing

Most sysadmins don’t need to understand much about IP routing, because most servers have only one network interface and one default gateway. The network administrator gives you an IPv4 address and a default route, you put them in the appropriate configuration files, and you’re routed. You don’t need even that for most IPv6 hosts, as autoconfiguration makes things magically work. Servers will need a static IPv6 address and a manual default route.

Some servers have multiple interfaces, such as one to their default gateway and another to a group of related application or backup servers. OpenBSD systems frequently wind up in the network infrastructure, however, or sit in demilitarized zones (DMZs) where the server must make routing decisions. ...

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