To configure IP hosts with the IP addresses of local routers and provide a way for hosts to sense routers that are
down, you can use Internet Control Message Protocol (ICMP) messages for router solicitation and advertisement
(as described in RFC 1256, "ICMP Router Discovery Messages"):
Router solicitations are sent by hosts to discover routers on their networks.
Router advertisements are sent by routers in response to a router solicitation and periodically to notify hosts on
the network that the router is still available.
The TCP/IP protocol for Windows 2003 supports ICMP router solicitations. The Windows 2003 router supports ICMP
router advertisements.
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