On Thu, 2012-01-05 at 15:55 -0500, Rick Thomas wrote: > On Jan 5, 2012, at 1:40 PM, John A. Sullivan III wrote: > > > On Thu, 2012-01-05 at 12:57 -0500, Rick Thomas wrote: > >> A limited amount of redundancy is good. If one goes down, the > >> network > >> can still limp along. > >> > >> Anyway, that's the theory. > >> > >> Rick > >> > >> On Jan 5, 2012, at 10:07 AM, Osamu Aoki wrote: > >> > >>>> I'm not the OP, but I do have this problem. When I try to do an > >>>> install (wheezy) on a network with two DHCP servers, the > >>>> installer's > >>>> dhcp-client never seems to get an IP address -- even though the two > >>>> servers are both responding and both giving the same IP address. > >>> > >>> Then why have 2? > >> > >> > > The problem is when they are administering addresses in the same > > range. > > I've not configured DHCP for a long time so maybe this is common now > > and > > the problems have all been resolved but, in the past, if one wanted > > redundancy, one would administer different ranges on the same subnet > > so > > that there would be no conflicts. Hope that helps - John > > Yes, that does seem to fit. > > The two servers have different ranges for their "dynamic" clients > (i.e. transient laptops with no fixed IP address) but for the "static" > clients (desktops with a fixed IP address) there is only one address, > so both servers have to provide the same address. > > So... when I do an install for a machine with an unknown Ethernet Mac > address -- hence getting it's IP from one or another of the "dynamic" > ranges -- all goes well. It's only when I attempt to install a > machine with a known Mac address (hence a single static IP) that I run > into trouble. > > Somehow, I would have thought it should be the other way round -- > conflicting responses would cause problems, not two responses that > both say the same thing. Sigh! Just shows how much I know... > > So is there a way to have both redundancy *and* reliable installs? > > Thanks for any help, > > Rick > > PS: As others have noted, it seems to affect only the installer's DHCP > client. After the reboot, there's no problem -- with either static or > dynamic IP... > Hmm . . . could you install with a manual IP address and then simply change the configuration once the installation is done? - John
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