iftop

iftop show bandwidth usage like top show cpu and memory usage.

First install required software.

yum install libpcap libpcap-devel ncurses ncurses-devel

Now install iftop. Make sure you download latest version from visiting the site http://www.ex-parrot.com/pdw/iftop/

cd /usr/local/src
wget http://www.ex-parrot.com/pdw/iftop/download/iftop-0.17.tar.gz
tar -zxvf iftop-0.17.tar.gz
cd iftop-0.17
./configure
make && make install

By default iftop monitor eth0. To monitor traffic on eth1, run

iftop -i eth1