| This matches the routing realm. Routing realms are used in complex routing | |
| setups involving dynamic routing protocols like BGP. | |
| .TP | |
| .BI "--realm " "[!] " "value[/mask]" | |
| Matches a given realm number (and optionally mask). If not a number, value | |
| can be a named realm from /etc/iproute2/rt_realms (mask can not be used in | |
| that case). |