|
|
2. The router "sees" the DHCPDISCOVER packet and forwards it to both
addresses simultaneously. Then DHCPOFFER arrives from (for example)
192.168.0.201, and what does the router do next? Does it send
DHCPREQUEST to 192.168.0.201 only, or to both addresses 192.168.0.201
and 192.168.0.202?
In DHCP operations,if the dhcp client finds the offer agreeable, it
will send another broadcast, a DHCPREQUEST, specifically requesting
those particular IP parameters. Why does the client broadcast the
request instead of unicasting it to the server? A broadcast is used
because the first message, the DHCPDISCOVER, may have reached more than
one DHCP server. If more than one server makes an offer, the
broadcasted DHCPREQUEST allows the other servers to know which offer
was accepted. The offer accepted is usually the first offer received.
|
|