howto configure DHCP to reject renewal of lease
dhcp1 at thehobsons.co.uk
Fri Oct 13 06:59:32 UTC 2006
Gilbert Coles wrote:
>Simon, you are definitely right and I thought about this all along but as
>you say some obstinate heads exist in the world thinking that IP rotation is
>the only way and this answer of yours is my final blow - that the world's
>most popular DHCP daemon doesn't do it, translating to: don't you dare ask
>me the ip f*&king rotation question again...
If management still insist on it, then my advice
is to look for a job with a more enlightened ISP
- don't wait till they go under and you're kicked
>Guess the traditional way of doing it for ISPs is using RADIUS and PPP auth
>since Radius tends to switch IPs but I was and still am against IP rotation
>- it destroys the notion of "always on" in the case of ISPs. So really mine
>was just a confirmation question.
I'd always assumed it was different in 'dial up'
situations, and re-use of addresses was a given
since there are generally many more users than
there are 'dial up' ports. Even with xDSL, there
are still a fair number of users still treating
it as dial up with a locally attached modem
though I guess the user-port ratio must be moving
close to 1.
Giving out a different IP each time a user
connects is not necessarily bad, the user cannot
have any existing connections to break. I do
however wonder at the per month charge many make
for fixed addresses (commonly £5/month here in
the UK) when with DSL and a hardware router the
user is going to be tying up and address 24x7
anyway so it really doesn't cost anything for
that address to be the same after a 30 second
My ISP automatically gives customers fixed
addresses - dynamic isn't even an option I think !
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