Softpanorama
May the source be with you, but remember the KISS principle ;-)

Contents Bulletin Scripting in shell and Perl Network troubleshooting History Humor

Solaris ifconfig

News See Also Recommended Links Reference ping netstat
hostname route command Traceroute Snoop Humor Etc

Introduction

This command is located in the /usr/sbin directory. The ifconfig command most commonly used to display information about the configuration of the network interface specified:

ifconfig hme0

If used by the superuser, the ifconfig command can configure all network interface parameters. On Solaris 9 the /etc/rcS.d/S30 network script uses it at boot to define the network address of each interface present on a machine. The /etc/rc2.d/S72inetsvc script also uses it later in the boot to reset any network interface configurations set by NIS/NIS+. The ifconfig command can also be used to redefine an interface's IP address or parameters.

Some examples of the ifconfig command are as follows:

Network Interface Configuration Examples

Displaying the IP Address

The ifconfig command displays the current configuration for a network interface. With the -a option, the ifconfig command displays the current configuration for all network interfaces in the system.

# ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 192.168.30.41 netmask ffffff00 broadcast 192.168.30.255
ether 8:0:20:93:c9:af

The previous example shows that:

 Marking an Ethernet Interface as Down

When an Ethernet interface is marked as down, it means that it cannot communicate. You can use the ifconfig command to mark an Ethernet interface as up or down. For example, to mark the hme0 interface as down, perform the commands:

# ifconfig hme0 down && ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
hme0: flags=1000842<BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 192.168.30.41 netmask ffffff00 broadcast 192.168.30.255
ether 8:0:20:93:c9:af

Note – The UP flags are no longer present. When an interface is flagged as UP, it is ready to communicate.

Controlling and Monitoring Network Interfaces

The following example shows that when you mark an interface as up, the UP status appears in the flags field of the ifconfig command output:

# ifconfig hme0 up
# ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 192.168.30.41 netmask ffffff00 broadcast 192.168.30.255
ether 8:0:20:93:c9:af
Sending ICMP ECHO_REQUEST Packets
To determine if you can contact another system over the network, enter
the ping command:
# ping sys41
sys41 is alive

A response of no answer from sys41 indicates that you cannot contact host sys41. This ims a problem with host sys41, or a problem with the network.

For the ping command to succeed, the following conditions must be satisfied:

Reference

The ifconfig command is used on Solaris (unix) machines to assign an address to a network interface or to configure your network interface. During system startup, ifconfig is called to define the network address of each interface present on your Solaris machine. ifconfig may also be used to redefine a network interface's address or other operating parameters, or to display the current configuration on an interface.

Syntax: ifconfig interface options

ifconfig example configuring a 3com network interface card:

ifconfig elxl0 10.0.0.1 netmask 255.0.0.0 broadcast 10.255.255.255

Where elxl0 is the interface with an ip address of 10.0.0.1, a netmask of 255.0.0.0, and a broadcast address of 10.255.255.255

Partial list of options taken from the man pages:

Solaris 10 Reference Manual Collection >> man pages section 1M: System Administration Commands >> System Administration Commands >> ifconfig(1M) – configure network interface parameters

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

OPERANDS

INTERFACE FLAGS

LOGICAL INTERFACES

MULTIPATHING GROUPS

CONFIGURING IPv6 INTERFACES

EXAMPLES

FILES

ATTRIBUTES

SEE ALSO

DIAGNOSTICS

NOTES

SunOS 5.10  Last Revised 26 Aug 2004


Etc

Society

Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers :   Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism  : The Iron Law of Oligarchy : Libertarian Philosophy

Quotes

War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda  : SE quotes : Language Design and Programming Quotes : Random IT-related quotesSomerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose BierceBernard Shaw : Mark Twain Quotes

Bulletin:

Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 :  Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method  : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law

History:

Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds  : Larry Wall  : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOSProgramming Languages History : PL/1 : Simula 67 : C : History of GCC developmentScripting Languages : Perl history   : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

Classic books:

The Peter Principle : Parkinson Law : 1984 : The Mythical Man-MonthHow to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Hater’s Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite

Most popular humor pages:

Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor

The Last but not Least


Copyright © 1996-2014 by Dr. Nikolai Bezroukov. www.softpanorama.org was created as a service to the UN Sustainable Development Networking Programme (SDNP) in the author free time. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Site uses AdSense so you need to be aware of Google privacy policy. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine. This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...

You can use PayPal to make a contribution, supporting hosting of this site with different providers to distribute and speed up access. Currently there are two functional mirrors: softpanorama.info (the fastest) and softpanorama.net.

Disclaimer:

The statements, views and opinions presented on this web page are those of the author and are not endorsed by, nor do they necessarily reflect, the opinions of the author present and former employers, SDNP or any other organization the author may be associated with. We do not warrant the correctness of the information provided or its fitness for any purpose.

Last modified: July 07, 2013