Computer slowing other computers down?

[saxguy67]

I had someone bring their computer over to my house, and when ever they turned it on and used it, it slowed all the other computers down. Two computers would get 30mbps, but when this computer would turn on, (wireless or wired), we would all get less than 2mbps. Does anyone know how to fix this issue?

 

 

[AnnoyedShelf]

1 minute ago, saxguy67 said:

I had someone bring their computer over to my house, and when ever they turned it on and used it, it slowed all the other computers down. Two computers would get 30mbps, but when this computer would turn on, (wireless or wired), we would all get less than 2mbps. Does anyone know how to fix this issue?

 

 

scan for malware.  often times it's either calling home, or downloading/uploading something malicious.  Had the same problem with my brother's laptop.

[saxguy67]

Just now, AnnoyedShelf said:

scan for malware.  often times it's either calling home, or downloading/uploading something malicious.  Had the same problem with my brother's laptop.

we used malwarebyte to scan for malware but it didn't find anything

[saxguy67]

Just now, huilun02 said:

Is his PC the only one on a wired connection?

Set up QoS on the router?

what do you mean by QoS? This problem both occurs at my house and at his house, and we've tried different connection types.

[AnnoyedShelf]

Just now, saxguy67 said:

we used malwarebyte to scan for malware but it didn't find anything

use netstat -a in the command prompt of that pc and look at your open ports.  If there are ones listing as "ESTABLISHED", look up what they are online.  Another thing you could try is using Wireshark to see what kind of traffic is running on the network.

[soup]

3 minutes ago, saxguy67 said:

what do you mean by QoS? This problem both occurs at my house and at his house, and we've tried different connection types.

QoS = Quality of service.

Usually determined by a piece of software which "decides" what packets get priority on your bandwidth.

 

A more in-depth analysis starts here :-

http://www.cisco.com/c/en/us/products/ios-nx-os-software/quality-of-service-qos/index.html

 

[saxguy67]

4 minutes ago, AnnoyedShelf said:

use netstat -a in the command prompt of that pc and look at your open ports.  If there are ones listing as "ESTABLISHED", look up what they are online.  Another thing you could try is using Wireshark to see what kind of traffic is running on the network.

So we did this, and right now it says there are 13+ established ports, when you say look up what they are online, what would we look up? 

[AnnoyedShelf]

Just now, saxguy67 said:

So we did this, and right now it says there are 13+ established ports, when you say look up what they are online, what would we look up? 

port numbers.  Look them up and see if any are malware related.

[saxguy67]

8 minutes ago, AnnoyedShelf said:

port numbers.  Look them up and see if any are malware related.

we used this website

http://www.sans.org/security-resources/idfaq/oddports.php

 

none of the established ports match any of these. there are some that dont have any numbers, is there any way to check those ports, or are they already safe? 

[AnnoyedShelf]

 

1 minute ago, saxguy67 said:

we used this website

http://www.sans.org/security-resources/idfaq/oddports.php

 

none of the established ports match any of these. there are some that dont have any numbers, is there any way to check those ports, or are they already safe? 

have you tried wireshark?

[B_Lake_1998]

Hey I am said friend, this is what the Command Prompt shows. (Not all of it)

 

[saxguy67]

1 minute ago, AnnoyedShelf said:

have you tried wireshark?

He has to leave soon, so I just want him to try that at home.

[AnnoyedShelf]

1 hour ago, B_Lake_1998 said:

Hey I am said friend, this is what the Command Prompt shows. (Not all of it)

I will happily analyze it for you, but unfortunately I don't have time today.  I'm studying for a 4 hour exam I have at 5pm and don't have very much free time at the moment.  I'll be able to help you tomorrow though.

[B_Lake_1998]

That would be really awesome if you could! Good luck on your exam.

6 hours ago, AnnoyedShelf said:

I will happily analyze it for you, but unfortunately I don't have time today.  I'm studying for a 4 hour exam I have at 5pm and don't have very much free time at the moment.  I'll be able to help you tomorrow though.

 

[brwainer]

23 hours ago, B_Lake_1998 said:

Hey I am said friend, this is what the Command Prompt shows. (Not all of it)

 

Nothing is showing up for me to look at (at least on the mobile site)

[B_Lake_1998]

3 hours ago, brwainer said:

Nothing is showing up for me to look at (at least on the mobile site)

I took it down. I would rather just have someone tell me how to do it so I don't give out any ip addresses or anything. Just for safety.

[TechFnatic]

10 hours ago, B_Lake_1998 said:

I took it down. I would rather just have someone tell me how to do it so I don't give out any ip addresses or anything. Just for safety.

If you run wireshark I'll analyze the dump for you and try to figure out the issue. Also what browser are you using? Try opening task manager and killing any processes related to your browser, some time extensions installed in browsers can cause issues like these (such as hola)