Bridge Ethernet-LAN With Tomato RAF 1.25.8515.2 ND?

Discussion in 'Tomato Firmware' started by The Doctor, Sep 22, 2009.

  1. The Doctor

    The Doctor LI Guru Member

    Bridge Ethernet LAN-WAN With Tomato RAF 1.25.8515.2 ND?

    I swear I've seen this before, but I could not find it with search. Maybe I saw it over at DD-WRT?

    Anyway, I need more LAN ports than what my router has, so I need to add a switch. I have a Buffalo WHR-HP-G54 which is retired because it will not overclock at all, so I run a WRT54G-TM as my primary router. Since the Buffalo is in perfect operating condition, already in my possession, and only pulls a very few watts, I'm going to use that strictly as a switch with all routing turned off (it will probably also act as a wireless access point, to take that load off the primary router, which is often times pushed very close to it CPUs limit). Just using the four ethernet ports will give me enough connections for everything I want, but the fifth hole is just sitting there, and I'm one of those folks who hates to see such a thing go to waste:smile:

    yes, I realize I will not get the full 100 Mb LAN speed through the WAN port if I can bridge it, but that is okay. I have a Linksys SPA-3102 which is going to be operating as a PSTN gateway, which does not require a very great deal of bandwidth. That would be a perfect thing to connect to the old WAN port, if I can do this.

    So, the question is, how does one go about bridging the WAN to LAN? I'm assuming I need to do something through the command line, or perhaps I need some type of custom script?

    Whatever help you can offer will be greatly appreciated.

  2. RonWessels

    RonWessels Network Guru Member

    Um, if you turn the WAN off, which you will want to do if you are only using it as a switch, the latest Tomato has a checkbox to use what would have been the WAN port for a 5th LAN port. Internally, it's a 6-port configurable switch, so there should be no difference in connection speed.
  3. The Doctor

    The Doctor LI Guru Member

    Thank you, Ron. Now I know where I saw that, I set up one of my spare WRT54G-TMs as a wireless bridge, for when I'm working on a computer and can't get it close to an ethernet cable. I probably saw that setting then. I have not actually tried configuring the Buffalo, I was just looking at the router which is handling my Internet connection when I posted the message. I kind of thought there was an option on the drop down to let you use the WAN port as part of your LAN, but when I looked on the list it was not there. It did not occur to me that a check box would show up after I selected disabled, and of course I would not want to select that on my active router anyway, it might adversely affect my connection:wink:

    After I upgraded the Buffalo to the version of tomato which I mentioned, I disabled the land, and the checkbox magically appeared. One little check mark, and the deal was done.

    For anybody else who wants to use this feature, I do need to make one small correction. What you say about getting full speed on the WAN port is not correct, you get full speed between any of the other ports, but quite a bit less on the WAN port. I tell that it into the router, and ran TOP. With no traffic passing through, the CPU idle percentage was between 98 and 100. With traffic being pushed between WAN and LAN ports, idle percentage drops down to around 10%. The router may contain a configurable six port switch, but checking that little box very clearly does not reconfigure the switch, it moves the traffic between WAN and LAN via software, just as it does when it's functioning as a router.

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