nixCraft: Linux Tips, Hacks, Tutorials, And Ideas In Blog Format » Networking

Solaris / Linux: nicstat Command Show Network Interface Card Statistics

nixCraft — Sun, 10 Mar 2013 22:37:44 +0000

The nicstat command is top like utility for network interface card (NIC). It displays information and statistics about all your network card such as packets, kilobytes per second, average packet sizes and more. It works under Solaris and Linux operating systems.

In this post, I will explain how to install and use the nicstat command to find out stats about your NICs under Debian / Ubuntu / RHEL / CentOS Linux operating systems.

Top 30 Nmap Command Examples For Sys/Network Admins

nixCraft — Mon, 26 Nov 2012 22:10:03 +0000

Nmap is short for Network Mapper. It is an open source security tool for network exploration, security scanning and auditing. However, nmap command comes with lots of options that can make the utility more robust and difficult to follow for new users.
The purpose of this post is to introduce a user to the nmap command line tool to scan a host and/or network, so to find out the possible vulnerable points in the hosts. You will also learn how to use Nmap for offensive and defensive purposes.

Testing HTTP Status: 206 Partial Content and Range Requests

nixCraft — Sat, 17 Nov 2012 12:18:42 +0000

The HTTP 2xx class of status codes indicates the action requested by the client was received, and processed successfully. HTTP/1.1 200 OK is the standard response for successful HTTP requests. When you type www.cyberciti.biz in the browser you will get this status code. The HTTP/1.1 206 status code allows the client to grab only part of the resource by sending a range header. This is useful for:

Understanding http headers and protocol.
Troubleshooting network problems.
Troubleshooting large download problems.
Troubleshooting CDN and origin HTTP server problems.
Test resuming interrupted downloads using tools like lftp or wget or telnet.
Test and split a large file size into multiple simultaneous streams i.e. download a large file in parts.

HowTo: Connect Two Wireless Router Wirelessly ( Bridge ) With Open Source Software

nixCraft — Fri, 31 Aug 2012 05:45:35 +0000

You can setup a wireless connection between two routers only so that it will link a wireless network to a wired network allowing you to bridge two networks with different infrastructure. You can find wireless access points products that offer either a "bridge" mode or a "repeater" mode. In this post I'm going to explain three popular open source choices that can be used for setting up a wireless bridge.

5 Linux / Unix Commands For Connecting To The Serial Console

nixCraft — Tue, 28 Aug 2012 11:29:02 +0000

Most embedded Linux / BSD systems such as routers, servers and nas devices comes with console interface (serial port with RS-232). BIOS can uses this, and after boot BIOS screen I/O is redirected so that you can use the device. RS-232 is also used for communicating to headless server, where no monitor or keyboard is installed, during boot when operating system is not running yet and therefore no network connection is possible. You need to use a serial cable between your computer and embedded system or server. In this post I will cover five conman utilities used for serial communication under Linux / Unix / *BSD and Mac OS X.