On 5/16/07, john harvey <[EMAIL PROTECTED]> wrote:

> If you have many machines, static ip is not a good solution. I'd set the
> expiration for a couple of months (maybe even 6) and rescavenge the dhcp
> data.

You need to quantify "many." I've had people tell me they had HUGE
databases because it took three (three!) floppies to back them up. Is
40 many? 300? 12,000?

Some shops I work with have smart DCHP servers (I think they're using
dnsmasq[1]) that hand out the same IP to the same Mac address each
time, and the admins know who that is. That range is separate from the
truly static IP addresses for fixed resources like servers and print
queues. Handy for tracking down bandwidth abuse or other problems, and
any admin can centrally control it, so they don't have to hike to a
user's workstation just to set their IP address. They have a smaller
range of dynamic IPs for guests, on a different subnet. Laptop/mobile
users can access the core business network via VPN, but the other
dynamic addresses just get internet access. So, it can work as a
security mechanism, too. Pretty cool stuff. When it all works right,
it's impressive to watch.

[1] http://www.thekelleys.org.uk/dnsmasq/doc.html

-- 
Ted Roche
Ted Roche & Associates, LLC
http://www.tedroche.com


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