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Path: ...!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: I never thought of this scenario
Date: Fri, 12 Apr 2024 23:57:55 -0000 (UTC)
Organization: A noiseless patient Spider
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On Wed, 10 Apr 2024 10:28:55 +0300, Tauno Voipio wrote:

> To break out, get RFC2131 and read it.

Here we go <https://datatracker.ietf.org/doc/html/rfc2131>:

* Client sends out DHCPDISCOVER. The only IP address involved is the 
local-net broadcast address, 255.255.255.255, which is non-routable.
* Server responds with DHCPOFFER. Since there is no IP address it can 
route this response to, it, too, is non-routable.
* The client may send out ARP broadcasts to ensure nobody else has already 
claimed the offered address.
* The client accepts an offered address with DHCPREQUEST, which, again, is 
sent to the (non-routable) broadcast address.
* The server responds with DHCPACK or DHCPNAK.

Remember, the client’s IP stack can not be considered to be fully 
operational until after all these steps have been completed.