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|LAN|----|switch|----|linux firewall|-----|switch|------|ADSL/border router|
The problem at the moment is that the Linux firewall has to have it's NICs on different subnets( external(ia dhcp from border router on 192.168.1.*) and it's internal on 192.168.2.*). I can, with the current border router, change the subnetmask to 255.255.0.0 so that it doesn't "mind" dealing with addresses on the two different subnets. However i can't add a route to the internal LAN(192.168.2.*).So the border router only knows that the linux firewall is reached at 192.168.1.*. And there's no way, on this border router, to add a route to 192.168.2.*. So i can't ping the border router from my ubuntu hosts on the LAN. I can ping the linux firewall's internal and external interfaces from the ubuntu hosts on the LAN. But i can't ping the border router from the LAN because it doesn't know how to get to 192.168.2.*.
I need to replace the border router, which is just a home router, with a machine that has all the usual capabilities of a home router/ADSL box AND the capability to add routes to other subnets. IIt needs firewalling capabilities because plugged into the switch(coming out of the ADSL box), in the diagram, are 2 Ubuntu servers. It would also be good if it could do things like changing the subnet mask. As flexible as possible.I'm willing to spend a fair bit i.e less than 200 pounds. Off the top of your heads is there any router that you could recommend that is good for a fully UNIX network involving different subnets that could replace a home router.
Or do i need a router that you can install a special Linux on? And if so are there any recommended?.
Thank you so much for your time and any replies. Fare ye well.