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From: Grant Taylor <gtaylor@tnetconsulting.net>
Newsgroups: comp.os.linux.misc
Subject: Re: I never thought of this scenario
Date: Sat, 20 Apr 2024 19:26:21 -0500
Organization: TNet Consulting
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On 4/20/24 15:33, Marco Moock wrote:
> How can a DHCP client assume that a remembered address can be still 
> used?

It can't assume.

But I believe that it can test for duplicate and ask the DHCP server via 
DHCP Request.

> If the lease is still valid, it can use it and contact the server via 
> unicast, if there is no valid lease, it must not use the IP anymore 
> because it could be assigned to some other node.

I think it SHOULDN'T use would be the proper nomenclature.

> IIRC IP unicast src addr can only be used if the lease is still valid 
> and the client wants to extend the lease.

Maybe.

> Of course asking the DHCP for additional information after the IP 
> has been assigned is another situation where unicast can be used.

Yep.

> Does anybody know other situations?

I assume that a release would also be unicast.



-- 
Grant. . . .