Please keep list mail on the list. Gnarlodious wrote: > On 7/16/07, Wakko Warner wrote: > >Gnarlodious wrote: > >> I would need to have another > >> device on the UPS battery. I want to have only two devices taking > >> power from the UPS battery, the modem and the server. > > > >A diagram might be more helpful. > http://etc.Gnarlodious.com/Images/Lan1.png So you have a dsl connection with 3 computers and a wireless router connected directly to it. I would assume that you want to keep those 3 computers from getting an IP via DHCP from the dsl modem? From the networking perspective, unless the ups is actually networked, has nothing to do with the network. (Personally, I would assign a static IP to the UPS). Does the DSL modem have a built in hub? >From the AP1 you have 2 PCs and another wireless router. Are these getting their IP from AP1? >From AP2 you have 2 PCs and nothing else. Since I don't know the interfaces on the AP devices, I don't know if they are routing traffic or switching traffic. I guess the real question is, does the 4 devices connected (according to your diagram) directly to your DSL modem have non-private IPs? (private IP ranges: http://tools.ietf.org/html/rfc1918 section 3). > >DHCP is broadcast when one requests an IP. That's why it's D(ynamic)HCP. > OK, I'm starting to understand that what I want can't be done. > > >The best way I can think of is to have a system (computer, router, whatever > >running linux) with 2 bridged interfaces and block DHCP traffic going > >across > >the bridge. > Any page that explains how to set that up? I'm not a network pro... The man page for ebtables and brctl. You'll need a linux kernel with bridging (802.1d support), ebtables enabled (Personaly, I just enable all the netfilter modules and let the system decide at runtime which onces to load), the drivers for 2 nics (I used 3c905b cards on a celeron 600 pc, throughput is around 8-9mb/sec). > And thanks for the hint about ebtables. You could probably do it with iptables on a bridging interface, but ebtables might be easier. -- Lab tests show that use of micro$oft causes cancer in lab animals Got Gas???
