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Author Topic: Dual uplink setup help request  (Read 23183 times)
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Posts: 7

« on: Friday 26 May 2023, 06:32:31 am »

My problem is to understand if EFW can handle my (very simple) topology and, if it can, how to set it up.

I have:
  • two modem/routers connected to the Internet
  • --- ModemA: ISP_A dynamic IP
  • --- ModemB: ISP_B routable IP
  • a single server which should be reachable from the Internet
  • a small home LAN (wired+WiFi Access Point)

I would like to place the two modems on RED, Server on ORANGE and everything else on GREEN.

                                |                |
                              ModemA           ModemB
                          (    (
                                |                |
          RED ( =====================
                        (       (
                              |                   |
    ORANGE ( =====      ===================== GREEN (
                              |         |    |    |       |
                           Server      PC1  PC2  PC3  WiFi-A.P.
The only quirk is double modem/routers on RED.

Specific needs are:
  • use ModemA (dynamic IP) as default uplink.
  • redirect all ports from ModemB (routable IP) to Server
  • use ModemB as uplink for Server
  • have some ping off-site to detect loss of connection on Modem A/B (2 different ISPs)
  • automatic failover in case one modem disconnects for any reason
  • incoming connections would be lost if ModemB is down, but that can't be helped AFAIK

I have seen "topic=1912.0", but I seem unable to add a second RED interface, reason
is it's not a second interface at all, but a second gateway on RED, in the same LAN segment.

Is this possible?
I don't have a fourth physical NIC on the machine I plan to use for EFW, I could add another
IP address on the same device, but I'm unsure.
Can someone advise, please?
I am just now playing with EFW so I might have missed something "obvious".

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