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WRT54GL seeing internet connection but connected systems can't access internet

Discussion in 'Tomato Firmware' started by losimagic, Apr 24, 2007.

  1. losimagic

    losimagic LI Guru Member

    (My ISP provides me with a static IP/mask, the gateway seems to change between between 1 or two addresses - Also, I'm in the UK and have to connect via PPPoA, which makes things more complicated :( )

    I have a WRT54GL running Tomato 1.06 which assigns connected PCs addresses in the range of 192.168.1.x in the mask

    I have a Zoom X3 modem in half-bridge mode attached to the WRTs WAN port, with an IP address of

    In order to access the configuration of that I have this within the WAN UP script section in Tomato:

    ip addr add dev vlan1 brd +
    /usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d -j MASQUERADE

    Tomato on the WRT is set to pick get the WAN details via DHCP and it correctly displays:
    IP: 83.67.xx.xxx
    Gateway: 194.106.xx.xxx

    However, PCs connected to the WRT cannot see the internet.

    If I connect a PC directly into the X3, the PC is assigned the correct values for IP, mask and gateway from my ISP and I can access the internet - this lead my to try cloning a PCs MAC onto the WRTs WAN port, this didn't help.

    Over on a forum a user suggested it could be a DNS issue so on the X3 I set up the following DNS servers: (OpenDNS) (ISP)

    and in Tomato: (the X3)

    I still couldn't access the internet.

    However I did eventually notice a few other IP addresses listed for the Vlan on the WRT; this IP addresses were:
    a similar range to the IP address that my ISP assigns me

    using cmd.exe I was able to tracert and ping these IP, however I still could not access the internet.

    I've been trying to find solution to this for the last week or so now and it's driving me insane

    One other thing, before I purchased the X3 I was using a Safecom SAMR-4112 modem in half-bridge mode (which is apparently built on the same (similar) conexant hardware) and had no problems at all. I didn't even need the WAN UP script, the WRT found the modem configuration at without any issues - sadly that modem blew up and I can't find stock anywhere, so I had to get the X3 - not many modems seem to do PPPoA in half-bridge mode :(

    Could this be a tomato issue or just hardware?
  2. azeari

    azeari LI Guru Member

    Well you could try pinging public domains like google through the router config pages to narrow down the issue, perhaps removing the dns entries to begin with.

    also, try removing the iptables script to see if it solves anything for now

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