LARTC - Apr 2004 - ip addr add vs ifconfig eth0:1

A stupid question: which is recomended? 

I have 1 interface eth0. I need to set about 20 virtual interfaces eth0:xx 
on it. 

If I create them with ifconfig eth0:xx I see it with ifconfig and with ip 
addr ls. If I set it with ''ip addr add'', ifconfig
don''t show them, but ''ip
addr ls'' and ''route'' show them. So, which is better? 

Thanks in advance.
PS: I can''t find anywhere docs about relationship between
''old'' utilities
ifconfig, route, etc and the iproute2 package. Point me to some comparision 
between them, please. 


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On Sun, Apr 04, 2004 at 07:44:50PM +0300, lartc@pro-technica.com
wrote:
> I have 1 interface eth0. I need to set about 20 virtual interfaces eth0:xx 
> on it. 
> 
> If I create them with ifconfig eth0:xx I see it with ifconfig and with ip 
> addr ls. If I set it with ''ip addr add'', ifconfig
don''t show them, but ''ip
> addr ls'' and ''route'' show them. So, which is
better?
If you create them with:
"ip addr add ... dev eth0 label eth0:xx"
you can still give them ifconfig-compatible labels, visible with 
both tools.

-- 
Alan Ford * alan@whirlnet.co.uk 
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Hello,

 : A stupid question: which is recomended?

The iproute2 tools expose all of the complexity of the Linux kernel in a
clear and transparent way, so I recommend iproute2 for any but the most
pedestrian uses of IP addressing on Linux boxen.  Naturally, for
workstations and standalone boxen, there''s no need--you will get the
same
result by using the much more platform agnostic ifconfig tool.

 : I have 1 interface eth0. I need to set about 20 virtual interfaces
 : eth0:xx on it.
 :
 : If I create them with ifconfig eth0:xx I see it with ifconfig and with
 : ip addr ls. If I set it with ''ip addr add'', ifconfig
don''t show them,
 : but ''ip addr ls'' and ''route'' show them.
So, which is better?

As a previous poster (Alan Ford) has suggested, you can use the label
parameter to your "ip addr" command lines.  This will allow you to use
both ifconfig and iproute2 tools to see what IP addresses are active on a
given interface.

 : PS: I can''t find anywhere docs about relationship between
''old''
 : utilities ifconfig, route, etc and the iproute2 package. Point me to
 : some comparision between them, please.

I don''t have any documentation specifically about the relationship
between
the two utilities, although you may find some answers in my guide [0].
Each utility reports (in a different way) on the current configuration of
interfaces and their addresses.

Best of luck,

-Martin

  [0] http://linux-ip.net/
      http://linux-ip.net/html/tools-ip-management.html

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com

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