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Avoid double NAT router-modem+WRT54GL

Discussion in 'Tomato Firmware' started by geekmiki, Apr 7, 2010.

  1. geekmiki

    geekmiki Serious Server Member

    Hi,

    I've just upgraded my ADSL2 connection to VDSL2 and got a new modem-router for it. It's an Inteno x5671 (also known as Xavi x5671) provided by Nextgentel (Norwegian ISP).

    Here's the deal: before that my setup was Internet->Speedtouch (bridged PPPoE)->WRT54GL w/Tomato->LAN. Perfect world...
    Since I have an IPTV service from Nextgentel the Speedtouch and Inteno are configured to have eth port 1 dedicated to the PPPoE through VPI/VCI 1.33 connection and eth port 4 is bridged to handle the TV stream through VPI/VCI 1.35.

    I tried to bridge the PPPoE port through the inteno web interface but it is impossible to get the WRT54GL to connect (which by the way worked flawlessly before with the Speedtouch). Tried LLC and VC MUX and all possible configuration scenarios.
    From what I've read on some Norwegian forums Nextgentel apparently blocks that kind of setup to avoid people bridging their modems (go figure out why...).

    So I was considering to go with the following setup in order to avoid more trouble (unless you have a suggestion for bridging):
    Internet->Inteno modem (10.0.0.1)->WRT54GL (WAN: 10.0.0.2 - LAN: 192.168.1.254)->LAN
    I want to avoid as much as possible double NAT and I was wondering if there's a way to redirect all the traffic from the modem to the WRT54GL and let it handle all the port forwarding and QoS jobs.
    I've read a couple of things on setting it to DMZ from the modem, static routes, etc.

    What would be the most effective way to acheive that and as mentioned avoid the hell of double NAT.

    Thanks in advance!
  2. ymm123

    ymm123 Networkin' Nut Member

    You could do as you suggested (Internet->Inteno modem (10.0.0.1)->WRT54GL (WAN: 10.0.0.2 - LAN: 192.168.1.254)->LAN)

    And just put 10.0.0.2 in DMZ in your Inteno modem/router. Should work fine...
  3. geekmiki

    geekmiki Serious Server Member

    That's what I did and it seems to work fine.

    Thanks for the confirmation and if anyone has a better idea, please share! ;)

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