Internet and Network connection loss

September 16, 2010 at 07:50:29
Specs: Windows Vista
Hello -- My internet speed was working fine. After installing Windows 7 on 25 computers out of 80, the issues started.
I have looked for an answer. All i get is how to disable windows 7 auto features.
Disabling is not fixing my issue.
I contacted my ISP ( they offered me more bandwith and they were surprise i have 80 computers connected to my modem, Siemens Speedstream 4100.
My router is a Linksys Wireless-G Broadband with Range Booster WRT54GR. I do not use the wireless tool thou.
I am even thinking to modify the topoly of my network.
If the speed was fine, what is happening now
I am very frustrated
Help Please
Please Help

See More: Internet and Network connection loss

September 16, 2010 at 08:42:51
Ok....first, I need to know, how do the problem computers connect to the network....are they all wired, wireless, or a mix of both?

You need to open a command prompt window (ie: Start >> Run >> type cmd and hit Enter) on a computer that isn't connecting and run the following command:

ipconfig /all

Please post the results of the ipconfig command in here so we can see it.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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September 16, 2010 at 08:45:30
You might also post your topology so we can review that also.

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September 16, 2010 at 10:55:49
Hello Curt R and Wanderer -- they are all wired

ipconfig/all results

Windows IP Configuration

Host Name . . . . . . . . . . . . : Student3-THINK
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Marvell Yukon 88E8057 PCI-E Gigabit Ethernet Controller
Physical Address. . . . . . . . . : 00-25-11-49-F8-D6
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Subnet Mask . . . . . . . . . . . :
Lease Obtained. . . . . . . . . . : Thursday, September 16, 2010 8:10:10 AM
Lease Expires . . . . . . . . . . : Friday, September 17, 2010 8:10:09 AM
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . :
DNS Servers . . . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

If the lab gets busy. I mean the 25 computers online, the rest of computers get very slow or non responsive
what kind of topology would you recommend?

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September 16, 2010 at 12:04:01
You are not running a server with 80 pcs?

Since you are pointed to the ISP for DNS I am not surprised your lan is slow. All name resolution is done by broadcasts which is the choice of last resort and takes time.

To discuss topology we need to know how many downstream switches there are from the router. For example you have router then switch then another switch then pcs?

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September 16, 2010 at 13:50:30
Hello Wanderer -- i have 80 computers. I have two servers. Both are used for shared data and applications for students and staff.
My modem (siemens speedstream 4100), has a router (wireless-G broadband with range booster WRT54GR). There is a smart switch (main switch) where i uplink other switches from to the first floor, second floor and third floor.
First Floor -- From the main switch, i have three computers directly connected, 1 jack always avaialable and 1 permanenetly in use jack, two networked printerw, two switches (A and B), and one uplink to Second floor.
From switch 1-A i have three computers connected and 1 jack available
From switch 1-B i have four computers connected
Second Floor -- 5 switches.
2A connects 2B, 2C, 2D, and 1 uplink to third floor
2B connects 2 servers, 2 computers, and 2E switch
2C and 2D connects the lab computers, 25, and 1 uplink to third floor
2E connects 6 computers
Third Floor -- 2A-1 uplink connects 3 swiches, and 1 hub
3A connects 6 computers
3B connects 7 computers and 3C switch
3C connects 6 computers
Hub connects two laptops
2C-1 uplink connects a 3D switch
3D switch connects 6 computers
I know it is a bit extense, but i really need help improving this network

Hope this makes sense


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September 16, 2010 at 14:19:12
You should have your own internal DNS server to handle lan traffic name resolution.

What OS is running on these two servers?

You have too many switches off switches. There should be no hubs.

proper topology design is as follows;

Server room contains the servers and a backbone switch [managed gigabit switch] with enough ports to support server growth and network expansion.

Each floor should all be wired to one location and that location has one switch with enough ports to support expansion.

Each floor switch is connected to the main backbone switch.

It is recommended you use the same switch on each floor except the backbone switch as well as purchase a spare which you can quickly swap out in case of switch failure.

You should not have pcs connected to switches that are acting as uplinks. This puts the pc traffic in conflict with all the other pcs that are connecting via the uplink.

Presently you have 11 switches uplinked to each other. The above recommendation reduces this to 4 with only uplinks to the backbone switch.
If for what ever reason you can't change the switches then wire them all to the main switch in the server room not each other.

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September 17, 2010 at 09:08:08
Wow before leaving, previous administrator recommended me to keep the network as it is.
I have contacted my ISP (at&t) They offer T1 private connection for $589 a year. Is it not crazy?
Will that infrastructure will also improve my network and internet speed?
If it will, would you recommended to change my router as well, Wireless-G Broadband with Speed Booster WRT54GR?

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September 17, 2010 at 09:29:30
The previous admin didn't know squat about topology which is evident in the present design.

Do you understand that you have switch throughput competing with pc throughput with the present design? That is like trying to run traffic in LA only using city streets with no highways or freeways.

Your switches are suppossed to be your freeways to the servers and internet.

$589 for a year [$49 a month] is not a bad price though I would not recommend a T1 since it is limited to 1.5mbps. Much better to go DSL or Cable with speeds starting at 1.5 and going up.

I would recommend a firewall router and would only do wireless on a very limited basis due to security concerns.

What are you using for servers? The first thing to address that will have a major impact is getting local dns working.

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September 17, 2010 at 09:58:43
I understand the throughput competition.

The servers use Windows Server 2003.

We dont use Wireless connection. We might, in a near future

Can you give me an example of a backbone switch?

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September 17, 2010 at 12:11:18
These 2003 servers are they running Active Directory? I assume not.
Ideally you would install dns server and dhcp services on one of the servers to get your local name resolution going.

Here would be an example of a managed gigabit switch for a backbone

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October 4, 2010 at 07:36:42
Hi wanderer -- I am sorry it took me so long to reply. I have to convince my boss that we need to change the network topology and i have to change wires and everything.
She is not too convinced, but will let me do some changes like place a 'freeway' from main switch to our lab
I will run DNS server and active directory in one of the servers.
I want to learn and also improve my network.
Thanks for being there.

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