# meta nfproto ipv4 rt nexthop 192.168.0.1
[
    {
        "match": {
            "left": {
                "meta": "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"
                }
            }
        }
    }
]