Internet on LAN getting Slow

I have Network on 30 computer is am using 3com switch and i have speedtouch DSL Modem for internet , i have pulg one cable form Modem on switch for internet sharing , i am not using ISA server. It was working fine for more then year , now suddenly i face a problem ."Internet is getting slow ".When i restart the modem internet work good for 5 to 10 min and again it become slow.

How to know which computer is using more internet bandwidth and making internet slow on internet .

Thanks in advance

Regards
Aijaz

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Aijaz1982Asked:
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shadowlesssCommented:
Wow...no firewall to protect your network?????
You can downloand a network monitor and see what is going on  www.wireshark.org
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Aijaz1982Author Commented:
Hi,

i am having windows 2003 server install & i want to install ISA server on .Kindly provide me with insatalltion step for ISA server 2000

Please suggest which one firewall software will be best for windows 2003 server .

Thanks is advance

REgards
Aijaz

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Keith AlabasterEnterprise ArchitectCommented:
No point. ISA 2000 went out of support in August 2006 - this was superceded by ISA2004, then ISA 2006 and now ISA2009/TMG is in beta 2 stage.

You will have - I expect (hope)  - a limited firewall on the DSL router assumning you are using its NAT capability and haven't opened up every port inbound....

If you want to trial ISA2006 then you can download a 6-month limited time evaluation version from the Microsoft web site - search for Forefront Edge

You can find a walkthrough guide here.
http://technet.microsoft.com/en-us/library/bb794856.aspx

keith
ISA MVP
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