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Currently I have a network with 1 ISP, a router/modem, Gigabyte Switch and a server.

All the clients PC are automatically assign IP from DHCP server from a Router/Modem A.

Server A have a fixed IP (eg: 192.168.1.50), installed Linux - used for a Web Server, Asterisk, and Backup use.

I need a new second ISP with separate modem but I want Server B (eg: 192.168.1.60) use ISP B network only. For example if I download anything or use SIP (Asterisk) from Server B - It will use ISP B connection and not other ISP connections. Also any clients PC should be able access to Server A (192.168.1.50) or Server B (192.168.1.60)

How can it be done? See example design below I think it might work?

Server B have two Ethernet Ports (One for Modem/Router and other connected a switch)

enter image description here

I'll-Be-Back
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1 Answers1

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Setup Server B as usual (pppoe/dhcp to ISP B via Router/Modem B) and configure the second NIC (that is facing the Switch) with a static IP address, OR you can configure that 2nd nic with DHCP as well but take care not to configure the Router/Modem A as gateway.

With dhcpcd(8) you can to this with --nogateway or with dhclient(8), remove the routers from the parameters of the request clause in dhclient.conf.

Endre Szabo
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