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DHCP client's IP release query

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Old 08-28-2012
satish51392111 satish51392111 is offline
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DHCP client's IP release query

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 lease time and the DHCP server was unavailable, and after 20secs, other servers can renew its lease time... but what about IP release?? Or, does the original DHCP server retain the IP (after it comes back online) finding the allocated IP unused??
Could not find the answer after considerable Googling!!

Thanks,
S.Satheesh.
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Old 08-28-2012
Corona688 Corona688 is offline Forum Staff  
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Quote:
Originally Posted by satish51392111 View Post
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.
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Old 08-28-2012
satish51392111 satish51392111 is offline
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Thanks!! Any idea about BOOTP relay agent?
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Old 08-28-2012
Corona688 Corona688 is offline Forum Staff  
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Is this homework?
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Old 08-28-2012
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Thanks!! Any idea about BOOTP relay agent?
Have you read this document: How to Configure a BOOTP Relay Agent (Solaris DHCP Administration Guide)
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