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I have a clean install of Ubuntu 10.04 plugged into our office LAN. Everything works fine except the Internet connection. I can open a couple of Internet pages then my browser starts "waiting" for any page requests. Pinging any public websites also takes long to reply and experiences packet loss greater than 70%. Updating software packeges also fails within a minute or so after started.

I have removed network-manager and installed wicd and problem stays exactly the same.

My /etc/network/interfaces file

auth lo
iface lo inet loopback

auth eth0
iface eth0 inet dhcp 

Any suggestions or other info I can give to nail this issue?

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2 Answers

Do the timeouts occur after a period of normal operation?

Try changing the network cable/point of connection to the network.

Connect you computer directly (using a crossover cable) to another computer, repeat ping and other network tests.

Check if other computer have difficulty contacting the Ubuntu 10.04 machine.

If you think it might be a configuration issue rather than hardware, get another live linux distro and see if the same problems occur.

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The timeouts occur after a period of normal operation, mostly less than a minute or so but sometimes a couple of minutes. Changed network cables and different network points around the office, same issue. Pinging IP's within the LAN works fine. Other computers can ping the Ubuntu machine without problems. Downloading another distro at the moment :) –  sizeight Aug 4 '10 at 14:14
    
Can other computers connect to the bad one over ssh/ftp and do a large file transfer? –  bryan Aug 4 '10 at 14:27
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up vote 0 down vote accepted

Problem solved. Turns out there was an IP conflict and Ubuntu doesn't automatically detect this.

A printer on our network has been assigned a static IP (by our IT dept.) within the dynamic IP range and the DNS server repeatedly assigned this IP to my Ubuntu machine. After another restart my Internet connection seemed to work perfectly, I checked and the IP was suddenly different than before. This got me thinking. Using Angry IP Scanner (excellent tool) I found that a printer was using the old IP.

I've changed the printer's static IP now and I'm planning to investigate IPWatchD, which is en IP conflict detection tool for Linux

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