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[ubuntu] Connected to internet but can't ping systems on LAN

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http://ubuntuforums.org – Hi all, I really hope I'm not doing anything dumb here. I've got Ubuntu 10.04 on my laptop and have recently (within the last 72 hours) started having trouble connecting to other machines on my local network. I'm unable to ping both my router and a server set up in the room beside me. 1. I have tried pinging my server and router from other machines and it works fine. Accessing the server via HTTP works from all machines except for my laptop. 2. I am, however, connected to my router via wireless and can access the internet. Also, if I connect via an ethernet cable I am able to ping bot (HowTos)