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How can i check which applications are using internet? How to block internet accessing one purticular application? Is there any gui tools exist for it in ubuntu software centre thanks in advance

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Do you need something like a firewall? Try gUFW from the Software Center. – Timo Feb 16 '12 at 14:06
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It is probably not possible to block a specific application without resorting to serious command-line geekery. You can use trickler from software center to limit an application's bandwidth usage, but it is also a command-line utility (use like: alt+F2 and enter trickler -d 1 -u 1 application). – taneli Feb 17 '12 at 13:15
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it is trickle not trickler – Tachyons Feb 18 '12 at 10:01

2 Answers

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lsof -i will list the applications that are accessing the network. There are some helpful examples in the man page but you might also want to look at Track network connections with LSOF on Linux.

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In addition to lsof -i which will list applications that have open network sockets as Richard mentioned, you can also install ufw and gufw which are the Uncomplicated FireWall and the GUI program that manages it. I haven't used either of these since 8.04 since I mostly use ubuntu internal to my own network, but they should have options for that. iptables is also a very popular firewall.

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