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Strange wireless problem?

Discussion in 'Tomato Firmware' started by nozmoking, Feb 4, 2010.

  1. nozmoking

    nozmoking LI Guru Member

    I'm currently running 1.27 on a WRT54GL. Everything sings along fine except for one particular desktop machine that is usually connected via Ethernet with a static IP for port forwarding. If I install and enable a wireless adapter and disable the Ethernet connection on the machine it connects to the router just fine but after several minutes the Internet simply goes away. I can still see other devices on the LAN including the router but Internet traffic just stops. It does not matter whether I set the wireless adapter for static IP or use DHCP, and it doesn't make any difference whether I use the router for DNS or configure the adapter to use outside DNS servers. I have other workstations using wireless adapters and sometimes wired connections but they've always been set to use DHCP. The issue seems to be the fact that I've used a static IP address for the Ethernet connection and then switched to a wireless adapter. I've tried several different adapters with the same result, and this issue was present with v1.23. I don't see anything odd in the logs.

    Any ideas? I'm pulling my hair out on this...
  2. michse

    michse Addicted to LI Member


    my idea is, that on the PC the standard gateway is not correct. I mean that your system knows 2 standard gateways. one on wireless and one on wired. and that is not correct.

    "route print" maybe your command

  3. nozmoking

    nozmoking LI Guru Member

    The gateway IP's are fine. I changed the machine name and that didn't help. The wireless adapters work fine on other machines and the only thing I have not tried is to set another machine to a static IP address then switch it to DHCP to see if I can duplicate the problem. The router logs don't show any problems, it's just that one machine loses Internet connectivity after being connected via wireless for a few minutes. If I bounce (reconnect) it to the access point it comes back to life. It never loses LAN connectivity, just the Internet, and it isn't related to DNS. it has to do strictly with routing. I just don't get it. I guess my next step is to try another WAP but I can;t imagine what information the router could be storing about this particular workstation. This one's got me baffled...
  4. TexasFlood

    TexasFlood Network Guru Member

    What OS/version does the workstation run? If Windows does the output of basic diagnostic commands like nslookup, netstat, tracert tell you anything?

    If this issue is so far isolated to a single workstation and not reproduced on any other then doesn't that tend to point to an issue with the workstation rather than the router?

    On my own network, for example, a home PC my family uses recently got infected with some sort of malware. I'm not even sure exactly what it is and my virus checker failed to detect it or fix it. Googling pointed to worms with similar, although not identical, symptons with some suggested remedies. I've spent some time today and yesterday cleaning this up and may not be done yet.

    Anyway, my point is that one of the symptoms initially looked like a network problem. I could get to the Internet and LAN but the LAN could not access or ping the PC. I realize this is not the same as your issue but my point is an issue with the PC looked like a network issue but had nothing to do with the router. I tried pinging from the router, no go, repaired the connection, no help, disabled the PCs software firewall, still no joy... After the googling I booted into safe more & deleted some files then downloaded and ran MalwareBytes, ran a scan and deleted some crud. After a reboot, everything worked fine again.

    Now this may have nothing to do with your problem, just food for thought.
  5. nozmoking

    nozmoking LI Guru Member

    Yes - it is certainly starting to smell like a workstation or Windows issue. I thought maybe the router had some problem with the same machine name juggling different MAC or IP addresses but not so. The issue is that as suspected, the wireless adapters lose their routing to the Internet and more specifically the default gateway. When it fails, even if I renew the DHCP lease or set a static IP, net mask and gateway, ipconfig reports the correct settings are in force but route print or netstat -rn reports a completely different story. The default gateway ends up being instead of the router's address. It comes and goes every so often, sometimes won't work at all on initial connect or sometimes runs OK for a while then poops out and the wireless connection has to be bounced altogether.

    Anyway, Tomato's off the hook on this one and it's back to the drawing board... to add misery to grief it's running on a cloned hard disk but I believe it was copied with XXClone which in my experience can result in occasional corruption deep in the OS where Windows creates very long binary identifiers for dynamic files, folders and registry keys.

    Now where did I put that CD key?

  6. nozmoking

    nozmoking LI Guru Member

    Sorry this thread drifted off-topic but I think I found the bug causing wireless adapters to lose the default gateway and end up randomly pointing to Although I have many machines using it without issue including both desktops and laptops with WiFi adapters the machine in question has LogMeIn Hamachi VPN software installed. The virtual network adapter the software creates uses a default gateway of and although it never intrefered with the Ethernet connection, for some reason it was hijacking wireless default router setting pretty much whenever it felt like it or maybe when the router responded to a DHCP request. Disabling the virtual network adapter and killing the Hamachi service fixed the problem immediately. I now have another issue to address but at least I can stop blubbering about it here.


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