Re: newbie to home network dhcp worries
From: Moon (elmoono_at_yahoo.co.uk)
Date: 01/09/05
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Date: Sun, 9 Jan 2005 17:45:26 -0000
'Why do you have both of these?'
free adsl modems from isp's usually have usb, i allready had the router that
needs an ethernet modem, so i bought the linksys modem thinking this would
solve the problem. My understanding is configuring the internet connection
this way will allow the other pc's to receive the net even if my pc is off,
as they are going to the router then modem.
-- Moon "Herb Martin" <news@LearnQuick.com> wrote in message news:%23v8xy8l9EHA.2552@TK2MSFTNGP09.phx.gbl... > "Moon" <elmoono@yahoo.co.uk> wrote in message > news:emBRuQl9EHA.3624@TK2MSFTNGP10.phx.gbl... >> ISP - Modem - Router - pc's > > Your most likely (REAL) problem is that the > modem has NO IDEA about the 192.168.2.x > network. See below for the solution to that*** > >> modem ethernet lead out to internet ethernet in on router, then pc's from > 3 >> of routers ethernet ports. >> >> modem getting dhcp from isp, modem set to 192.168.1.1 (internal?) sub net >> 255.255.255.0, > > That much makes sense. > > And the ROUTER needs to get an address like > 192.168.1.2 (or anything 192.168.1.x) manually > or by DHCP from the Modem. > > But note, if you aren't giving out the address to > the external side of the router automatically, > then DHCP on the modem is IRRELEVANT; > it will neither hurt nor help but it is irrelevant. > >> router set to 192.168.2.1 sub net 255.255.255.0, pc's getting >> dhcp and on checking status ip: 192.168.2.100, 192.168.2.101, > 192.168.2.102 >> all with sub net 255.255.255.0 > > That's fine and this makes the Modem DHCP > irrelevant to all but possibly the Router (external > side.) > >> Thats how it is now with both boxes serving dhcp, it does seem to work >> all >> pc's can talk/ping and access net, but is it the correct way? > > It's not really a DHCP question and those that told you > they could not both server DHCP were wrong, while > those that told you it would work were either wrong or > misunderstanding your real problems since the Router > is going to need a static address and only the router > will see the Modem DHCP. > > Why can DHCP work from both? Because they are > servicing DIFFERENT subnets. But let's fix the real > problems. > >> I assume the >> nat firewall is the same in both boxes, i run NIS05 as well and think i > have >> it set up correctly. > > It better not be -- it needs to be a DHCP client on the > external side OR you need to manually give it an > address compatible with the modem device address, > e.g., modem-192.168. > > ***Your most likely (REAL) problem is that the > modem has NO IDEA about the 192.168.2.x > network. See below for the solution to that... > > You need to add the equivalent of this static route > command to the Modem: > > route add 192.168.2.0 mask 255.255.255.0 192.168.1.2 > (but this will require a MANUAL address on the > router external, NOT DHCP, and not all little modems > can do this.) > > Why do you have both of these? > >
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