Symbol Type Code Description Query Error
0 redirect for network .
1 redirect for host .
2 redirect for type-of-service and
network
.
3 redirect for type-of-service and
host
.
8 0 echo request .
9 0 router advertisement .
10 0 router solicitation .
& 11 time exceeded:
0 time-to-live equals 0 during transit .
1 time-to-live equals 0 during
reassembly
.
12 parameter problem:
1 IP header bad (catchall error) .
2 required option missing .
13 0 timestamp request .
14 0 timestamp reply .
15 0 information request (obsolete) .
16 0 information reply (obsolete) .
17 0 address mask request .
18 0 address mask reply .
ICMP Message Types 637