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2x tomato in the same LAN (double default gateway)

Discussion in 'Tomato Firmware' started by rs232, Feb 23, 2011.

  1. rs232

    rs232 Network Guru Member

    Hi all

    I was thinking... what`s the best way to provide clients with a redundant default gateway?

    My idea is to have two tomato on the same LAN to get a sort of failover in case of WAN problems, however even tweaking the dnmasq config I don`t see a way to provide the clients with a double "option 3". e.g.

    Code:
    dhcp-option=3,192.168.0.1
    I also thought about passing the second default gateway using static routes to the clients e.g.

    Code:
    dhcp-option=121,0.0.0.0/0,192.168.0.2
    
    but using this second way I don`t get any control on the metric a therefore gateway preference top be used on the client.

    Is there perhaps something thing that simple I`m missing here?
     
  2. rs232

    rs232 Network Guru Member

    Sorry I think I`ve asked a stupid question this time :)
    Even if AP1 had WAN down all the clients with a "secondary" default gateway will still try to communicate to AP1, so I think the piece of config I`m after has to be put on AP1 saying use WAN when available or AP2 Ip address when not avaialble. So my question now changes into: How would you go testing the WAN on AP1 and removing it from the routing table in case of problems? A ping with -i would do to test but not sure what would it be best to re-test re-enable when WAN eventually is back online.
     
  3. mikester

    mikester Network Guru Member

    Do a google search for dual wan load balancing and failover
     
  4. TT76

    TT76 Networkin' Nut Member

    DNSMASQ can not get it. The command ip is a right way.
     

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