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Internet slow with wireless enabled

Discussion in 'Tomato Firmware' started by scolbeck, Dec 28, 2007.

  1. scolbeck

    scolbeck LI Guru Member

    I have a WRT54GL router with Tomato firmware 1.13. If wireless is enabled, my internet is terribly slow for both wired and wireless computers. It is especially bad for sites that require authentication. When I disable wireless, the internet speed goes back to normal.

    When I initially installed the Tomato firmware, everything worked fine for about a week. It is just recently where this problem came up. A reboot/shutdown of the router does not resolve the problem.

    Any thought as to what the problem may be?
  2. scolbeck

    scolbeck LI Guru Member

    I reflashed the firmware and while there is an improvement, there is still an issue with wireless being enabled. Now, access to sites is very intermittent. Sometimes the response is fine and a few minutes later the response slows. There does not seem to be any difference in the response time between wired or wireless access. When I disable wireless access, the response time stays high without any problem.

    I did some playing around with options including disabling wireless security and changing DSN servers but nothing seems to help.

    Since the logs do not give any help, is there some procedure I can go through to help me debug this problem?
  3. scolbeck

    scolbeck LI Guru Member

    To illustrate the difference between the response times with wireless enabled vs. disabled, I pinged 50 packets to a random web site. These ping results are directly from the router.

    Wireless enabled:
    Round-Trip: 54.1 min, 100.5 avg, 902.5 max (ms)
    Packets: 50 transmitted, 21 received, 58% lost

    Wireless disabled:
    Round-Trip: 54.4 min, 55.8 avg, 57.7 max (ms)
    Packets: 50 transmitted, 50 received, 0% lost

    As you can see I have both an increase in response times as well as substantial packet loss when wireless is enabled.
  4. Mastec

    Mastec Network Guru Member

    Never heard of this. I had a WRT54Gv3, same as a GL and never had that problem.

    Very strange
  5. scolbeck

    scolbeck LI Guru Member

    By following the instructions on the following web site, I noticed my MTU should be set to 1300 with wireless enabled and 1500 with wireless disabled. While setting my MTU to 1300 greatly helps my problem, I am still having some issues with wireless enabled.


    Does anyone know why having wireless enabled lowers what my MTU should be? I have Comcast as my Internet provider so from what I understand 1500 should be my MTU value. Also on my previous router everything works fine with the MTU set to 1500.
  6. scolbeck

    scolbeck LI Guru Member

    I lost my power over the weekend and when things came back up, everything works perfectly. Go figure since a shutdown/reboot didn't resolve the problem earlier.
  7. siimo

    siimo LI Guru Member

    Don't mean to state the obvious but are you sure your neighbors aren't leeching bittorrent off your wireless? :wink:
  8. scolbeck

    scolbeck LI Guru Member

    I highly doubt it. I have WPA2 security with a 64 bit AES key.
  9. Macskeeball

    Macskeeball LI Guru Member

    WPA2 and AES are computationally intensive and excessive. Even the simplest form of WPA has not been cracked, and it is less computationally intensive than what you are currently using. Therefore, I recommend using it: WPA (the original) PSK with TKIP to both reduce load on your router and save laptop battery life. Just be sure to use a strong password (both very long and very random), and you'll be set.

    There is some misinformation out there about WPA itself being cracked, but those are just referring to offline brute force attacks (read: trial and error) against weak passwords that. Such attacks also apply to WPA2 and any other PSK system, and are made futile with a strong password.
  10. lhahehal

    lhahehal Network Guru Member

    hey i am acutally having similar issues though slightly different. when i turn msn on my internet will lag like there is no tml till error 404 , with msn off its becomes more normal.

    probably i have the same problem scolbeck or just another different issuse cuz of different router. i usign wrt54gs
  11. j.m.

    j.m. LI Guru Member

    With respect to the WRT54G and other Broadcom-based routers, one will see better wireless performance using AES as decryption is done in hardware. See http://www.dslreports.com/forum/remark,14785735

    Also note the performance graphs and summary at http://www.smallnetbuilder.com/content/view/24649/96/1/8/
    "If you open up the full-sized view and eyeball the steady portions of each plot, I think you'll see that WPA-PSK with AES encryption imposes virtually no throughput penalty. Using WEP will cost you about 10% (33 vs 36 Mbps) and enabling WPA-PSK with TKIP extracts the worst penalty at about 17% (30 vs. 36 Mbps)."
  12. scolbeck

    scolbeck LI Guru Member

  13. scolbeck

    scolbeck LI Guru Member

    Well the problem doesn't look to be with the firmware. I moved to Tomato 1.11 as well as the latest Linksys firmware and I have the problem on both. Since it looks to be a problem with the router, I am going to return it for another.
  14. LLigetfa

    LLigetfa LI Guru Member

    Maybe a neighbor is leeching and running torrents.

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