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Slow Internet Access - Case Study

Situation: The client reported that their access to the Internet very slow while the LAN speed seemed OK.

Troubleshooting: 1. When testing by ping each other in the LAN, the time<1ms.

2. Ping chicagotech.net from the inside, the time>3000ms.

3. Ping the router from outside, the time>3000ms.

4. Unplugged the inside cable connecting the router, ping from outside receive time<10ms.

It seemed to us there is a networking device sent a lot packets to the Internet. Running anti-virus on all computer and found one Windows 2000 server as web and imail server had trojan virus. The internet access went back to normal after clean the trojan virus.

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