One clue is in RFC2131 [1]

[...]
A client SHOULD use DHCP to reacquire or verify its IP address and
   network parameters whenever the local network parameters may have
   changed; e.g., at system boot time or after a disconnection from the
   local network....
[...]

Still it says SHOULD, not MUST so it is really not so definite.

Best Regards,

-mat


[1] http://tools.ietf.org/html/rfc2131#section-3.7

2009/7/9 Michael Balasko <[email protected]>:
>
> Does anyone know of any RFC's that pertain to how a host device should
> behave regarding DHCP when the link come up? Newer windows machines and
> some flavors of *nix behave like I think they should and that is they
> will attempt to renew a DHCP lease on a link up. What we are finding is
> that all our Xerox devices and some specialized/ruggedized gizmos do NOT
> do this and it wrecks havoc with DHCP Snooping as you can imagine. I was
> hoping to beat Xerox with an RFC stick.
>
> Thanks for any help on this,
>
>
> Mike
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