Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have my network bandwidth eaten up totally. Whenever I connect my network, without any application being opened it is always full.

I have prepared report of iftop, nethogs and network system monitor.

iftop and nethogs

enter image description here

My host IP is and all the rest are not known though I have tried to pin, it doesn't reply.

If possible I would like to block the most disturbing IP which is to block it. but don't know how.

share|improve this question
Provide the output of nethogs or other network monitor here at and link them in your question. – atenz Aug 4 '12 at 19:15

Assuming your server (the machine from which samples screenshot are coming) is you network gateway, you can try with iptables with a command line like this:

sudo iptables -A FORWARD -s -j REJECT
sudo iptables -A FORWARD -d -j REJECT

This will block all traffic to and from That will cause you no problem, if you don't have private networks that you need access to, meaning that you're just routing traffic to internet. You'll have the risk that the machine simply change the IP address, then you'll have to figure out the mac address, for that you can use arp command:

$ arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface            ether   00:0f:b0:74:f1:f3   C                     eth0
share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.