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27Oct/101

How To Monitor Network Traffic by Process under Linux

NetHogs is a small network monitoring tool. Instead of breaking the traffic down per protocol or per subnet, like most tools do, it groups bandwidth by process. NetHogs does not rely on a special kernel module to be loaded. If there's suddenly a lot of network traffic, you can fire up NetHogs and immediately see which process is causing this. This makes it easy to indentify programs that have gone wild and are suddenly taking up your bandwidth.

To install NetHogs under CentOS, Fedora, RHEL, enter:

yum install nethogs

To install NetHogs under Debian and Ubuntu, enter:

apt-get install nethogs

The default network interface to monitor is eth0. If you wish to use other device, simply type the argument after nethog, open the terminal and run the following command:

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1Apr/102

How To Set Up OpenSSH Public Key Authentication

Secure Shell or SSH is a network protocol that allows data to be exchanged using a secure channel between two networked devices. Used primarily on GNU/Linux and Unix based systems to access shell accounts, SSH was designed as a replacement for Telnet and other insecure remote shells.

Before we start, make sure your computer has a SSH client installed and the remote Linux system has SSH installed and sshd running.

1. Generating RSA key

You will need to generate the local RSA key by running the following command:

# ssh-keygen -t rsa

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