Tomato and external modem - newbie

Discussion in 'Tomato Firmware' started by yoda230, Sep 10, 2007.

  1. yoda230

    yoda230 LI Guru Member

    I have two buffalo WHR-G54Ss and a buffalo external ADSL modem. I am thinking of putting tomato on these and have a few questions:

    1) Can the tomato firmware control the external modem? In the current firmware I supply the username, password, MTU etc. and it all sorts itself out. By the way the external modem is connected via an ethernet cable from the WAN port.

    2) Does WDS with WPA security work between two tomato firmwares? Would it work between an official firmware and a tomato firmware?

    3) Another option instead of WDS would be have the other buffalo acting as a client/bridge. I do not really need the AP functionality for that one as it is only connected to a few wired clients. Reading different bits of documentation I have got confused what mode I should really use, WET/client/bridge?

    I want to make sure that I have got this sorted before I actually make the change as I have heard that you cannot go back to the official firmware once you are off it.

    Many thanks
  2. xtxt

    xtxt LI Guru Member

    I have an external modem (am200) and wrt54gl set up as following. Basicaly the modem does the PPPoE connection, i disable the dhcp server on the modem and then set the up an IP in the dmz of on the modem. I then assign the wrt54gl using the tomato firmware to have a static ip of, and its default gateway is (the ip of the modem). The wrt54gl running tomato then runs as a dhcp server an assigns nodes in my network with inside 192.168.2.* ip range. I can then access the routers web interface at the IP and also the modems web interface at I cant answer any other of your questions but if you had a simular set up you would be able to configure both your routers and your modem presuming the modem has a web interface.
  3. yoda230

    yoda230 LI Guru Member

    I'm not sure if the modem has a web interface or not, I will try and find out.
  4. GeeTek

    GeeTek Guest

    Not sure about flashing Tomato into the external modem. Your 2 buffalo whr-g54s radios will make a great point to point link with WDS. They will also support wireless clients if you use AP+WDS mode. WDS with WPA encryption works fine. I would use dedicated WDS before I would use client or ethernet bridge mode. WDS with frame bursting will deliver 30 Mbps TCP throughput and is a MAC transparent bridge.
  5. mstombs

    mstombs Network Guru Member

    @xtxt what you are describing is double nat. This can work but some apps (ie vpn) require real ISP WAN IP to work correctly, and there are two sets of nat tables to fill (modem probably not optimized for P2P), 2 sets of port forwards to configure etc. If PPPOE better to put the modem into full bridge mode and handle the ISP username/password in the first router.
  6. yoda230

    yoda230 LI Guru Member

    It doesn't look like the external modem has a web interface. So am I correct in thinking that the tomato firmware can not be used to provide information such as the ISP username/password in the first router? Would an alternative such as DD-WRT or openwrt be able to do the modem interaction?

    It is my impression that the Buffalo official firmware cannot do WPA WDS and that is why I want to change it so much on both rather than just one.

    By the way, last night I flashed tomato onto the buffalo I am using as the "bridge" and it was a very simple process and I am impressed with the interface. At the moment I have got it running in client bridge mode with WPA, with the other router still having the official firmware on it.
  7. MartinTupper

    MartinTupper Network Guru Member

    That is incorrect. You can set up Tomato to automatically provide the username & password for a PPPoE connection.


    Enter the username & password, then save settings. The router will automatically connect through the modem.
  8. yoda230

    yoda230 LI Guru Member

    Thats marvellous. Thanks for that. I am now ready to convert my main router to tomato.

    So the final question is, which is better WET or WDS mode in the situation? I do not need to use the other router as an AP so WET would be fine, but does WDS have any advantages/disadvantages?

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