"" "None"
"0"  "Echo Reply"
"3" "Network Unreachable"
"3"  "Host Unreachable"
"3"  "Protocol Unreachable"
"3"  "Port Unreachable"
"3"  "Fragmentation needed but no frag. bit set"
"3"  "Source routing failed"
"3"  "Destination network unknown"
"3"  "Destination host unknown"
"3"  "Source host isolated (obsolete)"
"3"  "Destination network administratively prohibited"
"3"  "Destination host administratively prohibited"
"3"  "Network unreachable for TOS"
"3"  "Host unreachable for TOS"
"3"  "Communication administratively prohibited by filtering"
"3"  "Host precedence violation"
"3"  "Precedence cutoff in effect"
"4"  "Source quench"
"5" "Redirect for network"
"5"  "Redirect for host"
"5"  "Redirect for TOS and network"
"5"  "Redirect for TOS and host"
"8"  "Echo request"
"10"  "Router advertisement"
"10" "Route sollicitation"
"11" "TTL equals 0 during transit"
"11"  "TTL equals 0 during reassembly"
"12"  " IP header bad (catchall error)"
"12"  "Required options missing"
"13"  " Timestamp request (obsolete)"
"14"  " Timestamp reply (obsolete)"
"15"  " Information request (obsolete)"
"16"  " Information reply (obsolete)"
"17"  " Address mask request"
"18"  " Address mask reply"
