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On 13 Sep 2014, at 22:29, Martijn Grooten <martijn@xxxxxxxxxxxxxxxxxx> wrote: > At work, we have a LAN, which is connected to the Internet using a > DrayTek Vigor 120 ADSL2+ Ethernet Modem(*), which I once got after > someone (Gordon, I believe) recommended it. It's been giving me a lot of > pleasure. (Of course, that pleasure is mostly the absense of pain the > previous BT router had been giving us.) > > One of the boxes on the LAN is set up as the gateway and, through a > second interface, is connected to the modem. The box does all the DSL > stuff. All works well. > > At the same time, another machine also had a direct connection to the > Internet, connecting to a BT router through a second interface. That's > useful for maintenance purposes. > > But we have now replaced that router with another DrayTek modem of the > same make. And things don't really work.(**) There may be hundreds of > reasons for this, but I wanted to check if my reasoning is correct. > > (1) Having two modems connected to machines on the same LAN - although > on second interfaces on each machine - shouldn't be an issue, should it? yes and no - see other posts > > (2) The modem creates its own mini-LAN for maintenance. So it assigns > the machine IP address 192.168.2.10 through DHCP and assigns itself IPO > address 192.168.2.1. This allows you to connect to its web interface. Is > it a problem if both modems use the same IP addresses? Turn off DHCP on the one you don’t want to be a default route. and configure manually without setting a GW. This way the machine will use both lans (dual homed) but the default route will be the one using DHCP. - ( FYI they need to be on there own subnets! other wise all it will all bork - you’ve just set them as different hosts ) i.e. host nics 10.0.2.127 and 10.0.3.127 with a 255.0.0.0 mask - the router should be 10.0.2.1 > > I don't think either should be a problem - assuming one doesn't do funny > things with the routing - but I have a tendency to make daft mistakes > when designing a network. > if your plan is a resilient network - you need to do more complex stuff and working in a 192.168 sublan isn’t going to be useful use 10.0.0.x range. or you’ll run into issues later with VPN’s etc. > Thanks > > Martijn > > (*) http://www.broadbandbuyer.co.uk/products/7898-draytek-v120/ > > (**) The current issue is that we can't reach the modem, even though it > has assigned an IP address to the machine connecting to it. > > -- > The Mailing List for the Devon & Cornwall LUG > http://mailman.dclug.org.uk/listinfo/list > FAQ: http://www.dcglug.org.uk/listfaq -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq