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I'm a Archlinux user. I have had trouble in pacman for 2 weeks. And I can't decide it's the problem of the network or pacman.

I use virtualbox and have some virtual archlinux machines. Since last week in the office, whenever I run "pacman -Syu" I always get the "network is unreachable" error. I can ping the web address, I can ping the ip, I can browser the mirror sites and download the files. But whenever I run "pacman -Syu" I got the "network is unreachable" error!

Then I copied these virtual machines home and install them on my own virtualbox, "pacman -Syu" works without any error. I copied the vdi files back to office, got the same "network is unreachable" error. I copy them home, worked flawlessly...

It's driving me crazy, I have no clue where things went wrong.

I was so careless, there is nothing wrong about the virtual machines. The problem was the network configuration on the host machine. Please delete this post if its being misleading.

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Can you download with wget? It might be that your browser has found a proxy server that the command line doesn't know about. –  Paul Jul 30 '13 at 9:14
    
I didn't install Guis. Just base system. Sorry I did't make it clear that I browsered and downloaded the files on my host machine. Your question reminded me. I tried downloading use wget and failed and I can't connect to sites using links. Links hangs on "making connection" –  user1960581 Jul 30 '13 at 9:37
    
So where did you do the ping from? –  Paul Jul 30 '13 at 10:06
    
If you solve the problem yourself, post the solution as an answer below. Deleting the question is not necessary. –  grawity Jul 30 '13 at 11:49
    
I did the pingings from the virtual machines. I think that was what kept me think it was the virtual machine that was malfunctioning. –  user1960581 Jul 30 '13 at 12:38

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