# meta nfproto ipv4 rt nexthop 192.168.0.1 [ { "match": { "left": { "meta": { "key": "nfproto" } }, "right": "ipv4" } }, { "match": { "left": { "rt": { "key": "nexthop" } }, "right": "192.168.0.1" } } ] # rt ip6 nexthop fd00::1 [ { "match": { "left": { "rt": { "family": "ip6", "key": "nexthop" } }, "right": "fd00::1" } } ] # tcp option maxseg size set rt mtu [ { "mangle": { "left": { "tcp option": { "field": "size", "name": "maxseg" } }, "right": { "rt": { "key": "mtu" } } } } ]