Type codes indicate the ICMP pessage type. Below is a table containing the type codes, their meaning and additional field values for various codes.
Type | Meaning |
0 |
echo-reply |
3 |
destination unreachable code 0 = net unreachable 1 = host unreachable 2 = protocol unreachable 3 = port unreachable 4 = fragmentation needed and DF set 5 = source route failed |
4 |
source-quench |
5 |
redirect code 0 = datagrams for the network 1 = datagrams for the host 2 = datagrams for the type of service & network 3 = datagrams for the type of service & host |
6 |
alternate-address |
8 |
echo |
9 |
router-advertisement |
10 |
router-solicitation |
11 |
time-exceeded code 0 = time to live exceeded in transit 1 = fragment reassembly time exceeded |
12 |
parameter-problem |
13 |
timestamp-request |
14 |
timestamp-reply |
15 |
information-request |
16 |
information-reply |
17 |
mask-request |
18 |
mask-reply |
31 |
conversion-error |
32 |
mobile-redirect |
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