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Using Multiple Static IP's

By Scamper
May 28, 2010
  1. We have Internet service from two providers (Fios/Comcast)
    Each service includes 5-Static IP address:
    xxx.xxx.xxx.10 - 14

    Which connect to our internal LAN:

    I would like to segregate traffic between services, so that that Email traffic is on a different IP from users accessing the Internet.

    I would also like to have fail-over from the primary (fios) to secondary (comcast)
    (I don't need load balancing, the Fios connection is plenty fast)

    My plan is to take a 16-port switch and plug the two Ethernet connections coming from the providers into it.

    From there I'll attach:

    Watchguard Dual WAN Firewall
    Users accessing the Internet
    WAN1 Gateway: xxx.xxxx.xxx.10
    WAN2 Gateway: yyy.yyy.yyy.100
    configured with fail-over from WAN1 to/from WAN2

    Fios Supplied Router (or suitable replacement )
    Email Server
    Gateway: xxx.xxx.xxx.11 for Email

    Comcast Supplied Router (or suitable replacement)
    Email Server fail-over (set in DNS and on the server)
    Gateway: yyy.yyy.yyy.101

    My first question is, will this work? Normally you would have the Internet connection from the provider going directly into the router.

    Can I put a switch in between them?

    If so can I attach two Internet connections and three routers all to the same switch?

  2. jobeard

    jobeard TS Ambassador Posts: 12,817   +1,518

    This is a port forward solution:
    for ports 25, 110, & 143 (the emails), port forward each to the lan address that is closes to the specific ISP side desired, eg any lan address on router#2
    fall over is described well here

    you may need to multihome each client (which see)
    I'd have to think out the layout and setup ...
  3. Scamper

    Scamper TS Rookie Topic Starter

    In my case, fail-over is handled within the Watchguard box so all I need is to have DHCP assign the default gateway to each client PC.

    I will need that function, but on an exchange server you need to use Dead Gateway Detection rather than multihome.

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