Arch Linux

lmnsqshr

Member

From: Germany

Registered: 2013-10-21

Posts: 20

One Machine slows down my entire home network

Hi guys,

I'm having network issues.

I live in Germany and I'm subscribed to a coax-based ISP. They offered me a Router to use, which is the Technicolor TC7200.U. Yeah I know, it's the shittiest of the shittiest but it's a coax-based ISP and I didn't want to buy a new Router with a Coax-input.

So I have this TC7200.U now which has Wifi functionality. I got three smartphones, two notebooks and one desktop computer connected to it. All over wifi.
The Wifi works pretty fine until I connect with my desktop computer to it. As soon as I connect to the Wifi, the internet speed drops to ~50KB/s, sometimes <1KB/s. The weird thing is: Every other device connected to the same wifi gets speed problems too!
The DNS takes more than 10 seconds to resolv an IP and then I have to wait another 30 seconds or so to load the contents of the website. I use the Google Public DNS (8.8.8.8). Connections to IPv6 hosts seem to load faster but they load definitely way faster without the desktop computer connected to the wifi-network.

Oh yeah, I got DualStack Lite (One public IPv4 address for a pool of users and a quite large IPv6 pool for every single user of the ISP). It's like a neutered version of the internet.

On every notebook in my home network is the latest ArchLinux installed. All the smartphones are Androids (ranges from Gingerbread[2.3.7] to lollipop).

The desktop computer has following network controllers installed:

Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)

I suspect the Router, because I had no issues at all with my TP-Link with OpenWRT. I also wrote to my ISP about this. Those "technicians" remotely updated the router. I gave up on them long time ago, they aren't nearly as experienced as you guys are!

I don't know where to start looking. I can't even connect the computer via Ethernet to the Router because I can't get a link. The computer doesn't recognize I plugged the Ethernet cable in.

I'd really appreciate it if anyone could help me out! It's driving me crazy, my internet is useless with the desktop computer connected to it.

c3kay

Member

From: New Zealand

Registered: 2015-04-19

Posts: 61

Re: One Machine slows down my entire home network

i would say first step is to check network load on the desktop with nload or similar.

R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: One Machine slows down my entire home network

My guess would be to check the speeds at which your desktop connects, it is hard to say more without knowing more details about your desktop but I would guess that there is some bottleneck preventing the wireless on your desktop from reaching the full 54Mbps (at least). With only your desktop connected to the wireless check what down/up speeds you can achieve.

---

R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

th3voic3

Member

Registered: 2012-03-20

Posts: 92

Re: One Machine slows down my entire home network

I got the same router (same ISP I guess) after my old Cisco modem failed. Since I didn't want the hardware forced on me I attached my own router (running OpenWRT) to their router and set it up in "access point" mode (since the Technicolor can't be set to bridge mode). That's working pretty well. Since I'm on an older contract I don't have IPv6 enabled though.

---

Github

lmnsqshr

Member

From: Germany

Registered: 2013-10-21

Posts: 20

Re: One Machine slows down my entire home network

Thank you guys for the answers and sorry for my late response..

i would say first step is to check network load on the desktop with nload or similar.

I installed nload on my desktop and the network load is basically around 0~2KBit/s when idle which is OK I guess.
When downloading big stuff (e.g. from thinkbroadband.com) I'm getting speeds from 500~800 KBit/s. I have a 10 Mbit/s Internet connection, so the download speed should be much higher!

My guess would be to check the speeds at which your desktop connects, it is hard to say more without knowing more details about your desktop but I would guess that there is some bottleneck preventing the wireless on your desktop from reaching the full 54Mbps (at least). With only your desktop connected to the wireless check what down/up speeds you can achieve.

The test above (big file from thinkbroadband.com) was performed when no other device was connected to the Wifi.
What I forgot to mention is: When my home network slows down, the Router response time is abnormally high and gets timeouts very often.

My connection speed according to iwconfig is 72 MB/s. My i3 bar tells me that the connection is about 85~95% strong.

I got the same router (same ISP I guess) after my old Cisco modem failed. Since I didn't want the hardware forced on me I attached my own router (running OpenWRT) to their router and set it up in "access point" mode (since the Technicolor can't be set to bridge mode). That's working pretty well. Since I'm on an older contract I don't have IPv6 enabled though.

When I got the Router I changed it to "Bridge Mode", plugged in my TP-Link Router (with OpenWRT on it) and it worked. For a few hours. Then it resetted itself back to "Router Mode" and the TP-Link Router didn't work.
How do you set up the TC7200 to Access Point mode? I can't seem to find the option.
Btw, I have the software version STD6.02.11

Thank you guys for trying to help! I really appreciate it!

th3voic3

Member

Registered: 2012-03-20

Posts: 92

Re: One Machine slows down my entire home network

I got the same router (same ISP I guess) after my old Cisco modem failed. Since I didn't want the hardware forced on me I attached my own router (running OpenWRT) to their router and set it up in "access point" mode (since the Technicolor can't be set to bridge mode). That's working pretty well. Since I'm on an older contract I don't have IPv6 enabled though.

When I got the Router I changed it to "Bridge Mode", plugged in my TP-Link Router (with OpenWRT on it) and it worked. For a few hours. Then it resetted itself back to "Router Mode" and the TP-Link Router didn't work.
How do you set up the TC7200 to Access Point mode? I can't seem to find the option.
Btw, I have the software version STD6.02.11

Thank you guys for trying to help! I really appreciate it!

There is no special mode for that in the TC7200. I set the the TC's IP address to 192.168.1.9 and the OpenWRT router's address to 192.168.1.1 with IPv4 gateway set to 192.168.1.9. The Lan port is set to 192.168.8.1. So the LAN port is in a different subnet. I set port forwards for the entire port range to the OpenWRT router, so port forwards are managed on this router. This way its basically like having the TC7200 in bridge mode. I've set this up about a year ago, so I'm not entirely sure if that is enough to get it working, so if you need further information, ask away.

---

Github