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No access to Internet and router GUI, but it can be pinged

Discussion in 'Tomato Firmware' started by onehomelist, Mar 8, 2010.

  1. onehomelist

    onehomelist Addicted to LI Member

    I am facing a strange issue. I use tomato on Buffallo and Asus RT-N16. I use RT-N16 and I have kept Buffalo WHR as backup. AT random times I cannot get access to Internet and router webgui. But it accepts ping requests. SOmetimes if I reboot the router it gets solved, but most of the times rebooting also doesn't help. Very strangely most of the times it happens between 11 am and 1 pm. I have about 180 pc's and 6 wireless access points (with no authentication) which provide access to 100 more laptops and handhelds. I use 255.255.0.0 mask. On an average 50 to 60 users will be accessing internet. I have a 4 Mbp/s up and down link with a static ip. The ISP router, , is in our premises and it shows normal activity even when I am facing the issue. Once I changed the firmware of RT-N16 to DDWRT, but it showed up same issue. I tried with Asus stock firmware, it too showed up same issue. I tested with Netgear WGR614v9, again same thing happened.
     
  2. rhester72

    rhester72 Network Guru Member

    You're almost certainly running out of RAM. Search for the VIT script, have it dump to jffs if possible (CIFS otherwise) and/or set up an external syslog server and see where things are going wrong. I'm reasonably certain you will find out from VIT that your connection count is exceeding your available RAM.

    Rodney
     
  3. onehomelist

    onehomelist Addicted to LI Member

    I did a test where only one client was connected to the router, still bad results. I tried using a broadband modem/router (Zyxel) directly functioning as router. It worked without a glitch. As far as I know it has 8 Mb RAM. But Buffallo WHR, Asus RT-N16 and Netgear have more RAM, still they malfunction. Is it some kind of bug on broadcom chipsets? I'll try my best to get the log.
     
  4. rhester72

    rhester72 Network Guru Member

    The Zyxel is a fixed-function device, whereas running Tomato you're running a *lot* more processes (even if you're just using the Tomato built-ins, but if you've added your own packages or software it's even higher). You also have the ability to set the maximum connection count on Tomato yourself, whereas it's also likely to be hardcoded on the Zyxel.

    What is the value in Advanced/Conntrack/Netfilter/Connections/Maximum Connections (or "nvram get ct_max" from ssh if you prefer)?

    Rodney
     
  5. onehomelist

    onehomelist Addicted to LI Member

    I will let you know the stats you asked for as soon as possible? I have installed the router at the place where I work. Right now I am on off duty. Now, to provide you some more info about the tests I did, I have tested with stock firmwares on RT-N16 and Netgear WGR614L and DDWRT on RT-N16, and they showed the same symptoms.
    What happens is router functions properly for few hours suddenly internet connectivity is not accessible, routers GUI will not be accessible, but it responds to ping requests. Reboots also won't solve the issue. If I try a different router, lets say Netgear WGR614L with its native firmware, right at the time, it also shows up same issues. It looks like a DOS attack from LAN side. It's been happening for many days.
     
  6. rhester72

    rhester72 Network Guru Member

    Hrm...perhaps it's a heating issue? Assuming this is part of an industrial setup, is it possible that there is a temperature cycle causing the same behavior across multiple devices (since all of them are lucky if they even have passive cooling)?

    Rodney
     
  7. onehomelist

    onehomelist Addicted to LI Member

    I cleaned nvram, and I did all the settings again. Now ASUS RT-N16 is functioning properly. But Asus stock firmware and netgear WGR614L show up the same issue. But tomato has been running good since two days. The fault was not erasing nvram. Thanks rhester72 for helping me out. I use 255.255.0.0. Any idea about how many client can connect to tomato over LAN at a given moment? In my network the total number of connected clients is around 80.
     

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