[RV042]Load Balancing/Backup different SMTP server

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by mtijburg, Sep 28, 2007.

  1. mtijburg

    mtijburg LI Guru Member

    The load balancing or backup option with the dual WAN is a great option. The only problem is that we use different ISP's on the WAN ports with different SMTP-servers (and they don't allow connections from outside their network).

    The solution I was thinking about is entering the IP from the router into the e-mail clients of the users and then let the router decide wich SMTP server it forwards the request to, depending on the WAN port.

    Now the SMTP server from ISP1 is entered in the e-mail clients and we use the Backup connection option. Internet keeps on working when ISP1 goes down, but nobody can send e-mails this way.

    So does anybody know if it is possible and offcourse how?
    Thanks in advance
  2. pablito

    pablito Network Guru Member

    In this case I would setup a static route. Find out the IP of the server you need to use or better yet find out the whole subnet of that network. Then set a static route that sends that subnet via the default gateway of the WAN going to that ISP. Then all requests to the server will go over that WAN. It will still fail if the line goes down but at least it always works when it is up. You can do the same for each ISP's internal network. Making it fault tolerant and going to one or the other is a bit trickier.
  3. mtijburg

    mtijburg LI Guru Member

    Thanks for the response. That does sound like a reasonable solution so it's possible to use load balancing.

    I hope there will be just a new firmware with a default option for this kind of things. Imho most of the times smtp is limited to the network of the ISP, and with a load-balansing router it's logical to use different ISP's.

    Or does somebody else know a trick to get this working over two ISP's?
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