Why are direct downloads so slow when going through my router while downloading OK when connected directly to ADSL modem?

deepshark November 29, 2014

Hi, I’ve got a problem with download speeds.

My networking arrangement is PC => TP LINK TL-WR740N (router) => Zyxel P660RU2 (ADSL modem).

My TpLink has OpenWrt Barrier Breaker 14.07.

My internet speed is 5mb/s. Torrents download at around 500-600kB/s but direct downloads are very very slow, around 30-70kB/s. However, if I connect to my PC directly to the ADSL modem then direct downloads increase in speed to 500-600kB/s.

What is wrong ?

Thanks in advance.

  1. Jan F.
    November 29, 2014 at 8:07 pm

    As ha14 suggested there might be rogue devices on your network. When you connect directly to the modem there is no other device using your internet wherein the routers wireless capability allows other devices to use the internet simultaneously.

    Check your routers DHCP release table for unknown devices (stealing internet), make sure none of your other devices is using up bandwidth. Secure your wireless network.

    Basically, your router tries to distribute bandwidth between all open connections. When you are using a direct download it is using only a single connection wherein a Torrent download usually establishes a few hundred concurrent connections each getting it's fair share of the available bandwidth. Because of this your Torrent downloads will usually get a larger "piece of the pie" compared to a direct download when there are other devices on the network.

    • Me
      December 2, 2014 at 7:08 pm

      NO. It's definitely hardware problem. I'm the only client of router and I can see it in browser interface of router.

    • Jan F.
      December 2, 2014 at 9:22 pm

      I'm having a hard time making out a hardware problem from your description:

      Since Torrents work fine over the router it's neither a bottleneck in it's throughput speed nor a connections limit.
      Since your device works fine directly connected to the modem it seems unlikely something is wrong on your computers end e.g. a damaged network interface or a broken driver.

      Are you running some Anti-Virus, Internet Security or Firewall product which may may behave differently depending on the current connection? You could try disabling it and then test a direct download (from a safe source).

  2. Bruce E
    November 29, 2014 at 2:00 pm

    What are the network settings for both interfaces of your router? Also include the routing tables.

    • Me
      December 2, 2014 at 7:03 pm

      ADSL modem and router has DHCP servers.

    • Me
      December 2, 2014 at 7:04 pm

      Can't tell about static routing tables . The router in a service center for now.

  3. ha14
    November 29, 2014 at 11:59 am

    there can by a mysterious device check the DHCP list you can block it by MAC address

    • Me
      December 2, 2014 at 7:02 pm

      There is no reason to block any MAC addresses.

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