# meta nfproto ipv4 icmp type echo-request [ { "match": { "left": { "payload": { "field": "type", "protocol": "icmp" } }, "right": "echo-request" } } ] # meta nfproto ipv6 icmpv6 type echo-request [ { "match": { "left": { "payload": { "field": "type", "protocol": "icmpv6" } }, "right": "echo-request" } } ]