Networking two Linksys routers

Discussion in 'Tomato Firmware' started by lydgate, Apr 29, 2008.

  1. lydgate

    lydgate Addicted to LI Member

    Hi there,

    I have two WRT54G v2 routers running Tomato firmware. Let's call them A and B.

    A is running Tomato 1.16 and sits in my closet, connected to a cable modem, providing wireless to my flat.

    B is running Tomato 1.19 and sits in my room. I have the wireless turned off it because I couldn't get WDS working (well, it worked fine with my linux machines, but my flatmates' Windows machines kept having their DHCP reset for some reason).

    Anyway, now I have a wire running from one of the LAN ports of A to one of the LAN ports of B. I have a server and a laptop connected with a wire to B.

    My questions are:

    1. When I use my laptop to access the server (both connected to router B), I can tell that the traffic goes through A. Why is this? How can I stop it?

    2. When I plug the ethernet from router A into the Internet port of router B, the computers can't see each other or router A; however they can both see router B.

    Router A acts as my DHCP server; router B has a static IP address and doesn't serve DHCP.

    Any help is appreciated; I'm sure this is a basic and stupid network question.


  2. mikester

    mikester Network Guru Member

    You can do one of two things:
    1. Change the wireless settings on the laptop to prefer one wireless network over the other
    2. Disable wireless on one of the routers.
  3. lydgate

    lydgate Addicted to LI Member

    Sorry, I wasn't clear enough -- Wireless is only enabled on A, it's not enabled on B.

    What I want to do is use B as a regular wired switch (for now) -- and be able to move data between two machines wired to it, without having to go through router A (the DHCP server, wireless point, and connection to the internet).
  4. nvtweak

    nvtweak LI Guru Member

    I have similar setup in my house

    router A connected to cable modem, router B with DHCP disabled and connected via LAN port with crossover cable to router A LAN port.

    I can communicate between two machines connected to either router at 100Mbit/s. No routing is done because both machines are on the same network segment, bridged if you will, by the routers' switch ports.
  5. lydgate

    lydgate Addicted to LI Member

    Hmmm, then why would traffic be going through A for me? It seems the WRT54G is too smart for its own good...
  6. nvtweak

    nvtweak LI Guru Member

    What makes you think it goes through router A?
  7. lydgate

    lydgate Addicted to LI Member

    I can see it in the real-time bandwidth monitor -- when I start transferring a file, it shoots up on router A, and it's a lot slower than I'd expect going from one machine to another when they're both wired to the same router that's doing nothing else.

    (The wired connection from A to B is through the mains -- I know this is slower, but I see no reason it should go through there at all, when both machines are wired to router B. This is mainly why it's a problem going through A though.)
  8. nvtweak

    nvtweak LI Guru Member

    I see. It should not be showing up on the bandwidth monitor on either router, because the bandwidth graph does not show traffic between two LAN ports (unless somehow they got put on a separate vlan).
  9. TexasFlood

    TexasFlood Network Guru Member

    I have a similar configuration and wasn't sure how the traffic was routing. Then one day I rebooted router A while I had an RDP session open between a laptop and PC connect to router B. The RDP session was never interrupted so I assumed since then that traffic between clients connected to router B is routed locally on router B.
  10. nvtweak

    nvtweak LI Guru Member

    But routers shouldn't route anything between the LAN switch ports anyway. At least none of mine do.
  11. TexasFlood

    TexasFlood Network Guru Member

    I checked the bandwidth monitors and my local router B traffic from our example is only showing up on the router B bandwidth monitor, not on the router A bandwidth monitor.
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