The Illustrated Network

I

ICMP messages, 57

alternate host address, 203

Checksum field, 198

Code field, 197–98

codes, 198–203

Destination Unreachable, 198

Echo reply, 196

Echo request, 193

error, 177, 198, 199–201

fields, 197–98

firewalls and, 195

format, 196–203

format illustration, 197

IPv4 packets carrying, 193

must be sent, 204

must not be sent, 204

in path MTU discovery, 206–8

presence of, 204

query, 201–2

router advertisement, 203

sending, 203–4

solicitation, 203

suite, 198

traceroute, 203

Type field, 197

types, 198–203

See also Internet Control Message Protocol (ICMP)

ICMPv4, 208

ICMPv6, 152, 153, 196, 208–13

autoconfiguration, 211–12

changes, 208–9

Destination Unreachable message, 210

Echo Request and Reply messages, 211

error ...