icmpTypeV6: "" | "address-unreachable" | "bad-header" | "communication-prohibited" | "destination-unreachable" | "echo-reply" | "echo-request" | "neighbor-advertisement" | "neighbor-solicitation" | "no-route" | "packet-too-big" | "parameter-problem" | "port-unreachable" | "redirect" | "router-advertisement" | "router-solicitation" | "time-exceeded" | "ttl-zero-during-reassembly" | "ttl-zero-during-transit" | "unknown-header-type" | "unknown-option" | string