Uses the router with the highest preference level as the default
gateway (ICMP Router Discovery)
ICMP Router Discovery is useful if you have multiple gateways that
connect a particular subnet to outside networks. By using the
preference setting, you can select which gateway is the preferred
choice.
Informs sources that a packet has exceeded its allocated time to exist
within the network (ICMP Time Exceeded)
For more information about ICMP Redirect and ICMP Router Discovery,
see "ICMP Redirect" and "ICMP Router Discovery" later in this chapter.
Internet Control Message Protocol (ICMP)
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