Linksys router crashes regularly.

Discussion in 'HyperWRT Firmware' started by theanswriz42, Apr 3, 2005.

  1. theanswriz42

    theanswriz42 Network Guru Member

    Hello, I'm new and I appologize in advance for having a seemingly repetative problem as to what the majority of the threads are in the section.

    I recieved a WRT54G router a few days ago from Amazon and flashed the firmware nearly out of the box to HyperWRT. It seems that at least once or twice a day the router crashes on itself and cannot be accessed via telnet or the web front-end.

    I am a power user, putting about 1 to two GB of data through the box a day (which could be part of the issue, maybe?). I am running linux with my own compiled kernel and am on a fract DS3 (T3). Are there any suggestions how to keep the uptime of my router a bit better? So far it's had a rather poor track record.

    I spoke to a linksys tech and they were fairly useless, if you would like to read the transcript, i have it on one of my servers at

    Also, as mentioned in one of the threads I modified my start-up scripts as follows:

    echo 4096 > /proc/sys/net/ipv4/ip_conntrack_max
    echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
    echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
    echo 512 > /proc/sys/net/ipv4/neigh/default/gc_thresh1
    echo 2048 > /proc/sys/net/ipv4/neigh/default/gc_thresh2
    echo 4096 > /proc/sys/net/ipv4/neigh/default/gc_thresh3
    echo "600 1800 120 60 120 120 10 60 30 120" > /proc/sys/net/ipv4/ip_conntrack_tcp_timeouts 
    Any help would be greatly appreciated.
  2. zgamer

    zgamer Network Guru Member

    Try each of these under separate tests

    1) Try using the latest linksys firmware - to ruleout firmware problem

    2) pop the case open and set a fan near it blowing across the board - rule out heat issues...if you can't hold your hand near it(it's way too hot)

    Was this a new(sealed) item? or used?

    which revision of the wrt54g is it?
  3. theanswriz42

    theanswriz42 Network Guru Member

    The router was new in a sealed box. The router itself is WRT54G v. 3 and the firmware version is v3.03.6 - HyperWRT 2.1b1.

    I doubt it's a heat issue since I haven't increased the transmit power at all and the room the box is in is air conditioned. I'll try to flash the router back to defaults and try to rule out a firmware issue though.

  4. Xyse

    Xyse Network Guru Member

    Well, there is a very high chance that it is a heat issue. Stupid engineers at linksys replace the original mips processor with a much smaller version that is always hot(go measure yourself). Although it might not be a issue, but try zgamer suggestion on putting it near a fan so you can rule out the heat issue.

    Also, try using the ethernet to see if the same things happen. Because in 2.2, the router is almost 90+% bulletproof without touching the wireless.
  5. Rainey

    Rainey Network Guru Member

    I returned my WRT54G V2.2 for the same reason. It would lockup radomlly and i would have to power cycle it. It was much worst with the HyperWRT firmware for some reason.

    Same thing as you it happen most during a period when i would be downloading a few gig of info, it would just hang and not finish.

    I put my old befr41 switch/router in its place and everything is fine.

    There is reports starting to show up of some users not have thses problems with these newer routers. Either some chips were bad or Linksys done something to correct the issuse. It is still early and not enought reports on the positive side for me to repurchase this router at this time.
  6. Dowunda

    Dowunda Network Guru Member


    Try to flash the firmware when the router is not hot "Leave it off for couple hours" then do a hardware reset.

    Let us know how you go.

  7. Toxic

    Toxic Administrator Staff Member

    you could try lowering your qos levels to try to combat the thoughput you are using.

    The v2.2 and v3.0 has a different chipset to the earlier models. QoS and VLANs are somewhat affected by this as the support for the new chipset is not great with the wl driver. no doubt in time this problem will be fixed.

    have you tried Alchemy firmware?
  8. d95217686

    d95217686 Guest

    Startup script to stable the linksys wrt54g

    How about this settings? I use this setting run the router for more than one day without crash, in between I used the BT and P2P software and large file copying. But it may be also my luck.

    *** important things
    . Stop dhcp server, it will halt the router
    . Stop UPNP if possible to free more memory
    . HyperWRT 2.1 used

    # cat /tmp/
    sleep 2
    /sbin/telnetd -l /bin/sh
    echo 2048 > /proc/sys/net/ipv4/ip_conntrack_max
    echo 2048 > /proc/sys/net/ipv4/tcp_max_orphans
    echo 512 > /proc/sys/kernel/threads-max
    echo 4096 > /proc/sys/fs/file-max
    echo 0 > /proc/sys/net/ipv4/tcp_orphan_retries
    echo 1 > /proc/sys/net/ipv4/tcp_abort_on_overflow
    echo "60 180" > /proc/sys/net/ipv4/ip_conntrack_udp_timeouts
    echo "300 2400 120 60 120 120 10 60 30 120" > /proc/sys/net/ipv4/ip_conntrack_tcp_timeouts
    echo "50 500 0 0 200 1000 60 20 0" > /proc/sys/vm/bdflush
    echo "0 0" > /proc/sys/vm/pagetable_cache
    #echo "0 */3 * * * root /sbin/reboot" /etc/cron.d/reboot
    # uptime
    6:00pm up 1 day, 8:58, load average: 0.00, 0.00, 0.00
  9. theanswriz42

    theanswriz42 Network Guru Member

    I have just now flashed the firmware back to the original linksys settings. I'll leave that going for a day and see how that all works out, if i have the same problems I'll do what d95217686 suggests.

    Thanks for the help guys, I really appreciate it.
  10. theanswriz42

    theanswriz42 Network Guru Member

    As an update, I have flashed the firmware back to the linksys 3.03.6 and it hasn't crashed on me yet. The only thing that has changed besides that in my daily usage is the fact I haven't used bittorrent since I flashed the router. Maybe that's the variable causing all the problems, I don't know but so far things look good. I'll start using bittorrent again and see what happens.

  11. ryanknoll

    ryanknoll Guest


    any update on your situation? has the default firmware continued to behave normally? i have WRT54G v3 too and am debating whether to install HyperWRT.
  12. kop48

    kop48 Network Guru Member

    Yeah bittorrents appear to crash my router too. When I download off BT's, the torrents work fast, but then HTTP traffic just dies. :(
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