 |
|
Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
|
|
|
Custom Search
|
|
TCP/IP Configuration Utilities (ipconfig, winipcfg and ifconfig)
(Page 2 of 5)
ifconfig Syntaxes, Options and Parameters
Table 304 provides a simplified summary of the different functions that ifconfig can perform, and the syntaxes that are used to specify each in a typical UNIX implementation (NetBSD in this case). Table 305 describes the common options and parameters that can be used for many of these different modes. When ifconfig is used to modify an interface’s configuration, this is done by setting any of several dozen configuration parameters, using the syntax shown in the last row of Table 304; I have provided a brief description of some sample parameters in Table 306 (see your ifconfig documentation for a complete list).
Syntax, Options and Parameters |
Description |
ifconfig [-L] [-m] <interface> |
When ifconfig is called
with just an interface specification and no other options (other than
possibly “-L” and “-m”), it displays the configuration
information for that network interface. |
ifconfig
-a [-L] [-m] [-b] [-d] |
Displays information about all the interfaces on the host. The output may be restricted using the universal parameters shown, or by specifying an address family (see Table 305). |
ifconfig -l [-b] [-d] [-u] [-s] |
Lists all available interfaces on the system. |
ifconfig <interface> create |
Creates the specified logical network interface on the host, which is then configured using the syntax shown in the last row of this table. Note that some variations of UNIX allow certain parameters to be set at the time of creation. |
ifconfig <interface> destroy |
Destroys the specified logical interface. |
ifconfig
<interface> [<family>] |
Configures parameters for a particular interface on the host. If the address is being set, it is the first parameter specified, after the optional address family, if present. The “<dest_address>” is used to specify a destination address for a point-to-point link. After this, any of several dozen parameters may be specified for the interface, some of which are shown in Table 306. |
Option / Parameter |
Description |
-L |
Displays the address lifetime for IPv6 addresses. |
-m |
Displays all supported media for the interface. |
-b |
Limits the display of interface information to broadcast interfaces. |
-d |
Shows only interfaces that are presently down (disabled). |
-u |
Shows only interfaces that are presently up (operational). |
-s |
Shows only interfaces that may be connected. |
<family> |
Specifies a particular address family, either to limit output or indicate what address type is being configured. The value “inet” is used for IPv4 and “inet6” for IPv6. |
Parameters |
Description |
alias / -alias |
Establishes or removes a network address alias. |
arp / -arp |
Enables / disables the use of ARP on this interface. |
delete |
Removes the specified network address. |
down |
Marks an interface as being “down”, disabling it. |
media <type> |
Sets the media type of the interface to a particular value. |
mtu <n> |
Sets the maximum transmission unit (MTU) of the interface. |
netmask <mask> |
Sets the network or subnet mask for the interface’s address. |
prefixlen <n> |
Same as “netmask” but allows the mask to be specified using a CIDR-style prefix length. |
up |
Sets an interface “up”, enabling it. |
|
Note: Since creating, destroying or modifying interfaces can cause a host to stop working properly, administrative (super-user) rights are generally required on most systems in order to do anything with ifconfig other than examining the existing configuration.In Table 307, I have provided a sample output of the “ifconfig -a” command on one of the UNIX machines I use regularly, showing the settings for its interfaces.
%ifconfig
-a |
|
| |||||||||||||||||||
Home - Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.