DHCP client's IP release query

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http://www.unix.com – Hi All, I have two doubts here in DHCP Solaris environment.. could anyone please clarify me? 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?? 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?? If the client wanted to renew its IP leas (HowTos)