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//usr/share/system-config-network/help/network-aliases.html

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NAME="NETWORK-ALIASES"
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>Chapter 13. Device Aliases</H1
><P
>	<I
CLASS="FIRSTTERM"
>Device aliases</I
> are virtual devices associated
	with the same physical hardware, but they can be activated at the same
	time to have different IP addresses. They are commonly represented as
	the device name followed by a colon and a number (for example,
	eth0:1). They are useful if you want to have multiple IP address for a
	system, but the system only has one network card.
      </P
><P
>	After configuring the Ethernet device, such as
	<TT
CLASS="COMPUTEROUTPUT"
>eth0</TT
>, to use a static IP address (DHCP
	does not work with aliases), go to the <B
CLASS="GUILABEL"
>Devices</B
> tab
	and click <B
CLASS="GUIBUTTON"
>New</B
>. Select the Ethernet card to
	configure with an alias, set the static IP address for the alias, and
	click <B
CLASS="GUIBUTTON"
>Apply</B
> to create it. Since a device already
	exists for the Ethernet card, the one just created is the alias such as
	<TT
CLASS="COMPUTEROUTPUT"
>eth0:1</TT
>.
      </P
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>	  If you are configuring an Ethernet device to have an alias, neither
	  the device nor the alias can be configured to use DHCP. You must
	  configure the IP addresses manually.
	</P
></TD
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><P
>	<A
HREF="network-aliases.html#FIG-NETWORK-ALIASES"
>Figure 13-1</A
> shows an example of one alias for
	the <TT
CLASS="COMPUTEROUTPUT"
>eth0</TT
> device. Notice the
	<TT
CLASS="COMPUTEROUTPUT"
>eth0:1</TT
> device &#8212; the first alias
	for <TT
CLASS="COMPUTEROUTPUT"
>eth0</TT
>. The second alias for
	<TT
CLASS="COMPUTEROUTPUT"
>eth0</TT
> would have the device name
	<TT
CLASS="COMPUTEROUTPUT"
>eth0:2</TT
>, and so on. To modify the
	settings for the device alias such as whether to activate it at boot
	time and the alias number, select it from the list and click the
	<B
CLASS="GUIBUTTON"
>Edit</B
> button.
      </P
><DIV
CLASS="FIGURE"
><A
NAME="FIG-NETWORK-ALIASES"
></A
><DIV
CLASS="MEDIAOBJECT"
><P
><IMG
SRC="./figs/neat-aliases.png"></P
></DIV
><P
><B
>Figure 13-1. Network Device Alias Example</B
></P
></DIV
><P
>	Select the alias and click the <B
CLASS="GUIBUTTON"
>Activate</B
> button to
	activate the alias. If you have configured multiple profiles, select
	which profiles in which to include it.
      </P
><P
>	To verify that the alias has been activated, use the
	command <TT
CLASS="COMMAND"
>/sbin/ifconfig</TT
>. The output should show the
	device and the device alias with different IP address:
      </P
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><TT
CLASS="COMPUTEROUTPUT"
>eth0      Link encap:Ethernet  HWaddr 00:A0:CC:60:B7:G4
          inet addr:192.168.100.5  Bcast:192.168.100.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:161930 errors:1 dropped:0 overruns:0 frame:0
          TX packets:244570 errors:0 dropped:0 overruns:0 carrier:0
          collisions:475 txqueuelen:100
          RX bytes:55075551 (52.5 Mb)  TX bytes:178108895 (169.8 Mb)
          Interrupt:10 Base address:0x9000

eth0:1    Link encap:Ethernet  HWaddr 00:A0:CC:60:B7:G4
          inet addr:192.168.100.42  Bcast:192.168.100.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:10 Base address:0x9000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:5998 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5998 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1627579 (1.5 Mb)  TX bytes:1627579 (1.5 Mb)</TT
></PRE
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