Wireless encryption slows down wired Internet (WRT54GL, Tomato 1.27)

Discussion in 'Tomato Firmware' started by ozzikk, May 29, 2010.

  1. ozzikk

    ozzikk Networkin' Nut Member

    Hi everyone,

    I have router and firmware like in the title.
    My Internet cable connection is 15Mbps/1Mbps(up) which I verify with the online test provided by my ISP.
    Unfortunately I have spotted a problem with wired Internet download speed, which falls to roughly 6Mb/s when I turn on an encryption in wifi for other computers at home. The PC I measure the speed is connected to the router with cable and doesn't even have wifi card (during test nobody is using connection and I also exclude an attack since I use new genereated, long password for WPA2).
    Without wifi, cable Internet is as it should be (15Mbps).

    Do you think it could be a problem with Tomato?

    I'd appreciate any help, because I want to be able to use this 15Mb/s via cable, while encrypted wlan is on for my roomates.
  2. srouquette

    srouquette Network Guru Member

    it's normal, encrypted data take more bandwidth.
  3. ozzikk

    ozzikk Networkin' Nut Member

    I don't question that.
    The problem is with cable internet speed, which seems to be slowing down because of encryption, that as we know is not utilized in the wire.
  4. szfong

    szfong Network Guru Member

    Avoid connecting using TKIP, AES is hardware accelerated, however wireless on most routers are rather cpu intensive if utilized fully. To alleviate this you should use 2 or more if necessary, routers, one as an AP for wireless, the other router for wired and wireless only used sparingly on non-overlapping channels.

    A single router w/ a ~500+ MHz cpu is often used standalone for people w/ docsis 3 or fios connections.
    good luck
  5. ozzikk

    ozzikk Networkin' Nut Member

    I'm using AES, but the issue there might be its CPU as you said. According to wiki WRT54GL has only 200MHz CPU.
    I cannot rather use more than one router because I have only one output in my cable modem, which now is connected to the mentioned router.

    I'm considering the change of firmware, since I didn't find it on the Internet to be a common problem (15Mbps isn't the fastest connection in the world and this Linksys is quite popular one).
  6. Azuse

    Azuse LI Guru Member

    You should be getting ~25Mbt over wifi and full speed over the lan,the cpu is perfectly fine for that line speed unless it's being bogged down by a high number of connections or heavy l7 filters in the qos.

    Unless you have a special need for the 1.27 build load the raf mod, clear the nvram a few times and see what happens. Clocking the cpu to 250mhz also works well :)
  7. szfong

    szfong Network Guru Member

    I mean you connect one router to your modem and connect other router to one of the 4 lan ports of 1st router and disable dhcp server and give it static ip, etc...

    If you add alot of rules, multiple wireless clients maxing out wireless speed at ~25Mbps WILL bog down cpu. As stated earlier, setup at least 1 in AP mode and leave other in router+AP mode.

    Please read the Tomato FAQ for details, good luck...
  8. ozzikk

    ozzikk Networkin' Nut Member

    I've turned off QoS. Clearing NVRAM didn't help. Unfortunately I don't possess another router to check out that configuration.
    It's good to now that this CPU is enough to meet my demands.
    I think I'll go for a different firmware, though I have no idea what "raf mod" is and I'm not familiar with flashing anything different from Tomato.
  9. Azuse

    Azuse LI Guru Member

  10. ozzikk

    ozzikk Networkin' Nut Member

    I've cleared this memory second time and it seems like there's improvement. Now I can sometimes reach about 11 of 15Mbps.
    I think I'll check out this firmawe.
  11. ozzikk

    ozzikk Networkin' Nut Member

    Sorry for 2 consecutive posts.
    Szfong could you tell me what addressing would I have to use on that second router if I had it connected to 1st router as you mentioned?
    If I used 1st router as a AP in LAN, what static addresses should I set in WAN and LAN sections of the wired 2nd router?
    WAN =
    LAN = the same network as on AP or have to be different?
  12. szfong

    szfong Network Guru Member

    Router IP Address on AP can be:
    Subnet Mask:
    Default Gateway:
    Static DNS:

    Your 3rd AP can be, with the other three being the same, they point back to 1st Router.

    Your 4th AP can be, with the other three being the same.

    Turn OFF the DHCP Server on the APs ----> VERY important.

    Use WAN port for LAN ---> gets you an extra port (Tomato ONLY) :)

    These are just from memory, so can others verify this? thanx..

    btw, the Tomato FAQ is GREAT in explaining this in much better detail....

    2nd 3rd, or 4th Router in AP mode can be ANY router, not necessarily have to be Tomato.
    good luck...
  13. RonWessels

    RonWessels Network Guru Member

    Set WAN to "disabled" for your AP's.
  14. ozzikk

    ozzikk Networkin' Nut Member

    Wow, thank you all very much for these informations :smile:.
  15. ozzikk

    ozzikk Networkin' Nut Member

    I have upgraded to Tomato RAF 1.25.8515.2 ND but still there is no improvement in the performance. Most of the time get about 6 out of 15Mbps (8-9 max) when wireless is enabled (even without encryption).

    Have you got any more ideas what might be wrong?
    please, help
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