Solved

Slow Internet Connection

Posted on 2008-06-24
8
238 Views
Last Modified: 2013-12-14
We have a T1 (1.5 Mbits Down/1.5 Mbits UP)...We have a SonicWall TZ-170.
We are experiencing extremely slow internet browsing and ran a test at www.speedtest.net, with the following results:

Download = 1.3 Mbits
Upload = 38 Kbits

I am suspecting that someone might be downloading something from us, or someone is uploading something.

Anyways, what are the different ways that I can track down what is going on. What computer is uploading, etc.

Anyone more familiar with SonicWall, if there are any utilities that I can run there? Any help would be appreciate it. I have very limited experience with SonicWall Firewalls.
0
Comment
Question by:pzozulka
  • 3
  • 3
  • 2
8 Comments
 
LVL 12

Expert Comment

by:nsx106052
ID: 21859304
You could use ethereal or wire shark to sniff information on the network.  Both are free programs.  I would recommend installing the software on a gateway to monitor all traffic.  You can also look at your switches/routers and look which activity lights are blinking link crazy and try troubleshooting from there.  
0
 
LVL 7

Expert Comment

by:mabutterfield
ID: 21859836
What type of router is outside the firewall?  
0
 
LVL 8

Author Comment

by:pzozulka
ID: 21860059
Cisco 1700 Series Router
0
 
LVL 8

Author Comment

by:pzozulka
ID: 21861242
How would I go about putting WireShark on the gateway, if my gateway is a SonicWall Firewall and my router is a Cisco 1700. WireShark is only for Windows/Linux, and some other OS.
0
Zoho SalesIQ

Hassle-free live chat software re-imagined for business growth. 2 users, always free.

 
LVL 7

Accepted Solution

by:
mabutterfield earned 500 total points
ID: 21867675
I would recommend monitoring the utilization on the 1700 router first.  

Look at the output of 'show interface <serial int name>'

Look at the reliability, txload, and rxload.  

sample:
 MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255


The txload and rxload will tell you how much of the bandwidth is being used.  If your upload speed is tested at 38kbits, and it should be 1544kbits, then the txload will probably be above 200/255.  

You can continually check throughout the day, or you can use several different programs that use netflow, and/or SNMP to monitor the system for you.  If you'd like additional information let me know.

Regarding wireshark, you would need to put a hub between the router and firewall, or firewall and internal network, and plug the two devices and a laptop into it.  Run wireshark on the laptop, and it will monitor the traffic.  Or you could use a managed switch, and setup a mirror (span) port

router <------->hub(not switch) <-------> firewall
                              |-------->laptop with wireshark


Wireshark would be better at telling you WHAT is being transfered, while the counters on the interface will tell you HOW MUCH is being transfered.

good luck, and let me know how it goes.
0
 
LVL 12

Expert Comment

by:nsx106052
ID: 21867718
This link will help you find the software you want to download a program for your Cisco router to monitor bandwidth.
http://www.experts-exchange.com/Networking/Network_Management/Network_Analysis/Q_23228406.html?sfQueryTermInfo=1+cacti+cisco
0
 
LVL 7

Expert Comment

by:mabutterfield
ID: 21867752
nsx106052, that's a nice list.  Thanks for the post.

I would also like to add that I've used the products from Advent Net several times.  They have a free 30-day trial on most of their software, and some of it can be run for free for non-commercial use. (i run at home to tinker with my stuff).

NetFlow Analyzer will give you all sorts of pretty bars/charts/graphs of your network traffic.

http://manageengine.adventnet.com/products/netflow/index.html
0
 
LVL 8

Author Closing Comment

by:pzozulka
ID: 31470325
I went with the HUB idea between Router & Firewall. Thanks for the tip.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Optimal Xbox 360 connectivity requires "OPEN NAT". If you use Juniper Netscreen or SSG firewall products in a home setting, the following steps will allow you get rid of the dreaded warning screen below and achieve the best online gaming environment…
Sometimes you have to pull out old tricks to get a new firewall to work… While we were installing a new Sonicwall at a customers site we found that sites they were able to visit before were not working.  It seemed random and we could not understa…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now