Date: Tue, 16 Feb 1999 10:25:47 +0100 From: HERBELOT Thierry <Thierry.Herbelot@alcatel.fr> To: questions <questions@FreeBSD.ORG> Subject: Re: DHCP weirdness ? Message-ID: <36C9399B.48CCDAC7@telspace.alcatel.fr>
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Chris Peltier wrote:
>
> > From time to time, the IP address which is allocated to my machine
> > changes subnets (it goes from the xxx.yyy.18.zzz network to the
> > xxx.yyy.21.www). This seems to disturb wildly the Net connection (the
> > dhcp client complains about changing subnets, and often, I'm
> > obliged to
> > reboot to use the network).
> >
> > Atfer this (rather long) introduction, here is my question :
> > is it a good engineering practice to have the DHCP server
> > change subnets
> > in its response even though the machine does not change
> > physical network
> > ?
> >
> > (the rfc-2131 on DHCP specifically allows the subnet change - on p.27,
> > but I can't find a good reason to do so)
>
> The Cable providers do this to prevent customer from running
> servers on their network. They don't want to block inbound
> syn connections so instead they change IPs.
>
> -Chris
I didn't write what I meant : of course, this change of subnet is
designed to prevent customer servers.
The real question was : is the isc-dhcp client more robust in the case
of such changes ? (last night, my machine survived a change of subnet,
that is I didn't have to reboot it this morning even if the IP subnet
changed during the night)
( other questions would be : have other ppl on the list had the same
problem ? what is the policy of @home / Road-Runner ? )
TfH
PS : BTW, the DHCP client for theMac also suffers when changing subnets
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