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Multi-WAN with same gateway

MichaelDegen

Hello,

Our provider (Unitymedia, Germany) is giving us two links with IP addresses from the same network range. Gateway for both of these links is the same.
The IP assignment is done via dhcp reservation. Each link has its own cable modem,  both links have the same speed.

Like this but with public IPs:

Is it posssible to use Multi-WAN with load-balancing? And how is it configured?

Greetings,
Michael



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  • 0

    MIchael,

    you have 2 links and same network range. It will not does not work, I think. The only thing you can do is to create a bridge on both ports belonging to WAN zone.

    Did you try to configure 2 different ports and giving them the IP as WAN zone?

  • 0 in reply to lferrara

    Hello Iferrara,

    thanks for the Reply. It is more a pre-buy question. Currently we have 2 routers with one internal subnet uses one link, the other the other link. Not a satisfying solution.

    We're looking for a solution capable of load-balancing the 2 links. If this is possible with Sophos XG (or UTM), my next step would be the setup of a test environment.

    Greetings,
    Michael

  • 0 in reply to MichaelDegen

    can't see a reason why this wouldn't work, i have the same setup with 2 WANs on a CGN private subnet.

    ---

    Sophos UTM 9.3 Certified Engineer

  • 0 in reply to Ben

    Hello Ben,

    That sounds good. Do you have any special configuration?

    Greetings,
    Michael

  • 0 in reply to MichaelDegen

    i use multipath to route one internal subnet over WAN A, and another subnet over WAN B.

    Basicly using 1 Firewall for 2 Families, each using their own WAN.

    ---

    Sophos UTM 9.3 Certified Engineer

  • 0 in reply to Ben

    Good to know. I never tried it.

    If the XG does not complain that you can create 2 WAN interface with same IP range, after on Policy rule you have DSCP marking and WAN Link Manager also inside XG. So
     you can decide how to load balance a single Rule.

  • 0 in reply to lferrara

    oh sorry, i didnt realize i was on the XG Subforum, i am only using the UTM. (no-coffee-brain this morning)

    ---

    Sophos UTM 9.3 Certified Engineer

  • 0

    I just tried setting this up today and it would not load balance or fail over to the second WAN connection due to them being on the same subnet with the same gateway, even though they do have different IP's.  I talked to support for 2 hours and they tried to make it work, but then said it won't work with the same subnet on 2 different WAN interfaces.  (Our setup is for 2 wireless bridges in-line.)  So I think the next step is to purchase a switch or other such devices that will aggregate the links for me... Unless anyone has other ideas?

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