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Originally Posted by
satish51392111
1. If a new client comes up and it needs an IP to be assigned by a DHCP server, how can it communicate with the DHCP server in the first case without any IP? The SUN doc says something about "BOOTP" agent but could not understand it. Can anyone enlighten me here??
Remember that ethernet can carry more than one kind of protocol; in the end it's just another level of frame. You can still broadcast without an IP, using your MAC address. The DHCP server can broadcast back.
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2. What would happen if the client was shutting down and it sent a 'IP release request' (to the DHCP server which provided its IP) but the DHCP server in question was unavailable?
Then the DHCP server wouldn't get the message, and would consider the IP to still be occupied.
Eventually it would time out, not being renewed, and be considered free again by the DHCP server, and possibly given to someone else should a request be made.