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WDS grants access to wrong VLAN

Discussion in 'Tomato Firmware' started by mcbsys, Mar 23, 2012.

  1. mcbsys

    mcbsys Networkin' Nut Member

    Hi,

    I have a Linksys E2000 running tomato-E2000-NVRAM60K-1.28.4407.1MIPSR2-Toastman-VLAN-RT-VPN.

    VLAN 1: Wired LAN1 (br0). DHCP is OFF (DHCP comes from an internal Widnows server).

    VLAN 2: WAN.

    VLAN 3: Wireless LAN1 (br1). DHCP is ON.

    More details on my setup here. With help from Teaman and Toastman, I got VPN working to a remote E3000 by adding this to my firewall script:

    iptables -A FORWARD -i br0 -o tun21 -j ACCEPT

    That has all been stable for several months.

    Yesterday, I tried to set up WDS and add a second local wireless router as a bridge. The router is a Netgear WGT624v3. With security off or set to WEP, I got the bridge working. The problem is, when I connect a machine to the Netgear, it gets an IP from the _wired_ network, i.e. from VLAN 1.

    Since the purpose of VLAN 3 is to isolate the (less secure) wireless network, I was concerned to see that just adding a bridge granted direct access, through the wireless connection, to my supposedly separate VLAN 1.

    Is there something I need to do to get the bridged router to connect to VLAN 3 instead of VLAN 1?

    Thanks,
     
  2. teaman

    teaman LI Guru Member

    Yes, definitively! What exactly? I'm afraid I'm not quite sure just yet - sorry :/

    While haven't did much experimenting with WDS myself, I think I might have a few ideas that might be worth exploring :)

    So first of all, there's this thing I've learned while looking at the Tomato sources: there seems to be quite a lot of code that usually/simply assumes there will be only two 'sides' of things - one WAN connection and just one LAN interface.

    With that in mind, I've taken a brief look in the code and found two possibly-relevant pieces of code:

    * void notify_nas(const char *ifname)

    http://repo.or.cz/w/tomato.git/blob/VLAN-GUI:/release/src/router/rc/wnas.c#l142
    * void hotplug_net(void)
    http://repo.or.cz/w/tomato.git/blob/VLAN-GUI:/release/src/router/rc/network.c#l731


    That first function seems to call "nas4not" at some point and one of its arguments seems to be always "lan", which is not much of a surprise, considering that statement about WAN/LAN interfaces above :). So, with some experimenting... it might be still possible to get some kind of WPAx going. Bad news is... "nas4not" is actually a symlink for "nas", which is a proprietary binary from Broadcom and unfortunately, not much of documentation available is available - so there's no way of knowing if such thing would eventually work - but if it does, please let us know how it was done ;)
    On that second function we find a call to "brctl" and yet another reference to that "lan" interface. You might wanna run something like "brctl show" - if you do find your WDS iface as part of br0... then you could perhaps try using things like "brctl delif/addif brX XX" and see how things work out.
    Best of luck!
     
  3. mcbsys

    mcbsys Networkin' Nut Member

    Thank you, thank you, thank you!

    I have to confess, my first reaction was to look in my attic to see if I couldn't string a network cable instead :). But it turned out to be pretty easy to move the WDS interface to the same VLAN used by the wireless:

    # Delete WDS bridge interface from br0
    brctl delif br0 wds0.1
    # Add WDS bridge interface to br1
    brctl addif br1 wds0.1

    I blogged the details here:

    Configure a WDS Bridge on a Tomato Guess VLAN
    http://www.mcbsys.com/techblog/2012/03/configure-a-wds-bridge-on-a-tomato-guest-vlan/

    Thanks again,
     
  4. teaman

    teaman LI Guru Member

    I sense we just might need a small clarification in there: I'm not actually the author of Tomato’s VLAN functionality - that was already in there! I did, however, write a VLAN GUI so it would be useable/easier for everyone else out there ;)

    Cheers!
     
  5. mcbsys

    mcbsys Networkin' Nut Member

    Awesome, thanks for that clarification--and for making the GUI! Post updated.
     

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