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Old 10-06-2009, 06:25 PM   #1
wanas
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Question net drops while others in the same network download something or browse the net !!


I have small network consists of me and 2 others, the net drops when others browse the net or download something.
The net drops that makes my msn disconnect and if im downloading something it stops.

- The speed that I have is 1mb\256
- I have a Tp-link router model:TD-8840
- Im using ubuntu linux 9.04 and the other using windows xp and 7
- Others dont use netcut or any of this stuff
- When im alone on the network (other closing there computers) the net is working fine

I called the ISP about this problem but they told me that we dont have to fix network problems maybe its a virus on the network or something :S
 
Old 10-06-2009, 07:12 PM   #2
pljvaldez
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It may be that for some reason the router is giving preference to the programs on the Windows machines. This is probably some form of traffic shaping. Many routers have some advanced settings deep down in the menus that deal with QoS (Quality of Service) that grant priority to certain things like VoIP. You might fiddle with the settings on the router and see if you can get something like an "equal bandwidth for all mac addresses" type setup (or give your machine a higher priority ).
 
Old 10-06-2009, 07:22 PM   #3
wanas
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1st thanks for replay pljvaldez
I found this thing that called (Quality of Service)
but I cant deal with it
here is the screen shot of the page
Attached Images
File Type: png Screenshot.png (107.2 KB, 7 views)
 
Old 10-06-2009, 07:37 PM   #4
pljvaldez
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I'm not an expert and most of that screenshot is greek to me. Maybe someone else can explain some of those terms and what they should be set to.

My router has something similar (not exactly) to this. I can just enter my machines MAC address and give it a HIGH priority. I can also specify applications/ports with high priority.
 
Old 10-06-2009, 11:58 PM   #5
anomie
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Are you sure one of the other hosts on your network isn't stealing your IP address?
 
Old 10-07-2009, 12:23 AM   #6
wanas
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Quote:
Originally Posted by anomie View Post
Are you sure one of the other hosts on your network isn't stealing your IP address?
The problem is it happen with the 2 of them
and the 2 of them dont know how to install windows, I dont think that they can steal my IP or something like that
 
Old 10-07-2009, 12:45 PM   #7
anomie
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They may not be doing it intentionally.

It's worth a quick test next time it happens:
Code:
# tcpdump -i <interface_here> arp
Then try pinging your own IP address and see if you have multiple hosts replying to the arp who-has query.
 
Old 10-08-2009, 09:35 AM   #8
wanas
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here What I got when I typed the command until the net drops
My ip address is 192.168.1.2 and my mac address is 00:1A:4D:8E:B5C
the others have 192.168.1.3 & 192.168.1.4
Quote:
wanas@192:~$ sudo tcpdump -i eth0 arp
[sudo] password for wanas:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
16:08:55.438693 arp who-has 192.local tell 192.168.1.1
16:08:55.438713 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:09:55.432377 arp who-has 192.local tell 192.168.1.1
16:09:55.432400 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:10:55.436117 arp who-has 192.local tell 192.168.1.1
16:10:55.436141 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:11:19.303523 arp who-has 192.local tell 192.168.1.4
16:11:19.303547 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:11:53.742552 arp who-has 192.168.1.3 tell 192.168.1.4
16:11:55.444807 arp who-has 192.local tell 192.168.1.1
16:11:55.444823 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:12:55.453604 arp who-has 192.local tell 192.168.1.1
16:12:55.453620 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:13:18.906133 arp who-has 192.168.1.3 tell 192.168.1.3
16:13:18.981602 arp who-has 192.168.1.3 tell 192.168.1.3
16:13:19.981636 arp who-has 192.168.1.3 tell 192.168.1.3
16:13:21.660319 arp who-has 192.168.1.1 tell 192.168.1.3
16:13:55.447271 arp who-has 192.local tell 192.168.1.1
16:13:55.447293 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:14:55.485994 arp who-has 192.local tell 192.168.1.1
16:14:55.486021 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:15:25.487907 arp who-has 192.local tell 192.168.1.1
16:15:25.487931 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:15:55.479777 arp who-has 192.local tell 192.168.1.1
16:15:55.479801 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:16:20.016839 arp who-has 192.local tell 192.168.1.4
16:16:20.016867 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:16:25.481614 arp who-has 192.local tell 192.168.1.1
16:16:25.481632 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:16:55.473443 arp who-has 192.local tell 192.168.1.1
16:16:55.473464 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:17:25.465307 arp who-has 192.local tell 192.168.1.1
16:17:25.465326 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:18:00.342476 arp who-has 192.local tell 192.168.1.1
16:18:00.342498 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:18:25.612578 arp who-has 192.168.1.1 tell 192.168.1.3
16:19:00.301160 arp who-has 192.local tell 192.168.1.1
16:19:00.301182 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:20:03.800117 arp who-has 192.local tell 192.168.1.1
16:20:03.800146 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:20:55.523331 arp who-has 192.local tell 192.168.1.1
16:20:55.523358 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:20:59.686655 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:00.683686 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:01.683779 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:04.070876 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:05.069013 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:06.069015 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:07.977914 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:08.974183 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:09.974283 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:12.497701 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:13.494483 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:14.494565 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:16.533555 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:17.529741 arp who-has 192.168.1.3 tell 192.168.1.1
16:21:18.348659 arp who-has 192.168.1.3 tell 192.168.1.3
16:21:18.449293 arp who-has 192.168.1.3 tell 192.168.1.3
16:21:19.449394 arp who-has 192.168.1.3 tell 192.168.1.3
16:21:21.057585 arp who-has 192.168.1.1 tell 192.168.1.3
16:21:21.242822 arp who-has 192.local tell 192.168.1.4
16:21:21.242849 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:21:25.500177 arp who-has 192.local tell 192.168.1.1
16:21:25.500198 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:21:55.477070 arp who-has 192.local tell 192.168.1.1
16:21:55.477096 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:22:25.478948 arp who-has 192.local tell 192.168.1.1
16:22:25.478966 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:22:55.480771 arp who-has 192.local tell 192.168.1.1
16:22:55.480795 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:23:25.482690 arp who-has 192.local tell 192.168.1.1
16:23:25.482709 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:23:55.484527 arp who-has 192.local tell 192.168.1.1
16:23:55.484543 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:24:03.709206 arp who-has 192.168.1.3 tell 192.168.1.4
16:24:05.968021 arp who-has 192.168.1.4 tell 192.local
16:24:05.968833 arp reply 192.168.1.4 is-at 00:e0:4d:c6:7c:7e (oui Unknown)
16:24:25.486337 arp who-has 192.local tell 192.168.1.1
16:24:25.486368 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:24:55.503694 arp who-has 192.local tell 192.168.1.1
16:24:55.503716 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:25:25.510084 arp who-has 192.local tell 192.168.1.1
16:25:25.510116 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:25:42.620507 arp who-has 192.168.1.3 tell 192.168.1.4
16:26:25.503809 arp who-has 192.local tell 192.168.1.1
16:26:25.503832 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:26:33.981908 arp who-has 192.local tell 192.168.1.4
16:26:33.981931 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:27:25.562541 arp who-has 192.local tell 192.168.1.1
16:27:25.562564 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:28:25.606235 arp who-has 192.local tell 192.168.1.1
16:28:25.606260 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)
16:29:25.540094 arp who-has 192.local tell 192.168.1.1
16:29:25.540114 arp reply 192.local is-at 00:1a:4d:8e:b5:dc (oui Unknown)

Last edited by wanas; 10-08-2009 at 09:36 AM. Reason: forgotten
 
Old 10-08-2009, 02:09 PM   #9
anomie
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That output looks OK. Your host / MAC address was the only reply to the arp queries. So, red herring.

When the other hosts come online, and you lose your 'net connection, does that mean you can't access your router any more? Or does it mean you only can't access hops beyond your router?

Next time try:
Code:
$ ping 192.168.1.1
Any reply?

Then try:
Code:
$ ping 74.125.67.100
Any reply?
 
Old 10-09-2009, 06:53 PM   #10
wanas
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Quote:
Originally Posted by anomie View Post
When the other hosts come online, and you lose your 'net connection, does that mean you can't access your router any more? Or does it mean you only can't access hops beyond your router?
I dont lose my net connection its only a drop for 2 seconds or something like that when someone els using the net at the same time, I mean when the other one sharing the bandwidth with me at the same time the net drops happen, after that I can access any thing like normal but if I'm downloading something it stops and my msn and skype disconnect and connect again.

I hope I make you understand the situation, sorry for my bad english :S
 
  


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