Nmap Development mailing list archives

Re: dhcp script!


From: Kris Katterjohn <katterjohn () gmail com>
Date: Tue, 08 Sep 2009 11:32:30 -0500

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On 09/08/2009 09:43 AM, Ron wrote:
My concern about DHCPREQUEST is side effects -- does it reserve that IP
address?


Regardless of whether you use DHCPREQUEST by default or just as an option,
couldn't you just specify the lease time (option 51) as 1s?

Obviously it'd be better to not actually grab an IP address, but this seems
reasonable if somebody wants to use this type (or needs to because others fail
or something).

Note that I'm just throwing this out there.  All I've done is just glance at
section 9.2 in RFC 2132.  DHCP servers could very well not allow any low lease
times (either by the protocol or configured not to).  However maybe if a
server defaults to a >=1 day lease time, and you specify 1s, it'll give you a
lease of something much lower like a half-hour or so.  I'm just speculating as
I don't know much about DHCP other than just what it takes to have a
functioning LAN (which isn't all that much).

Anyway, I hope this was at least worth reading ;)

Ron


Cheers,
Kris Katterjohn

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