icmpTypeV4:
| ""
| "communication-prohibited"
| "destination-unreachable"
| "echo-reply"
| "echo-request"
| "fragmentation-needed"
| "host-precedence-violation"
| "host-prohibited"
| "host-redirect"
| "host-unknown"
| "host-unreachable"
| "ip-header-bad"
| "network-prohibited"
| "network-redirect"
| "network-unknown"
| "network-unreachable"
| "parameter-problem"
| "port-unreachable"
| "protocol-unreachable"
| "redirect"
| "required-option-missing"
| "router-advertisement"
| "router-solicitation"
| "source-route-failed"
| "timestamp-reply"
| "timestamp-request"
| "TOS-host-redirect"
| "TOS-host-unreachable"
| "TOS-network-redirect"
| "TOS-network-unreachable"
| "ttl-exceeded"
| "ttl-zero-during-reassembly"
| "ttl-zero-during-transit"