[TriLUG] multiple IP from the same network card?

[lfwelty]

How do the virtual interfaces work w/ different subnets if you are connected
via the same physical interface?

ie. Do you have to be plugged into a switch that can handle different subnets
on the same interface?

Jason Tower wrote:
> what you are describing is a virtual interface, and it's a snap.  for a quick 
> and dirty setup, you can simply run the following:
> 
> [root at bigtoe root]# ifconfig eth0:0 10.1.1.1
> 
> which results in something like the following:
> 
> [root at bigtoe root]# ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:A0:C9:5A:DF:F7
>           inet addr:10.0.0.100  Bcast:10.0.0.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:454545 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:311037 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           RX bytes:94017376 (89.6 Mb)  TX bytes:31798276 (30.3 Mb)
>           Interrupt:10 Base address:0xdc00 Memory:ef201000-ef201038
> 
> eth0:0    Link encap:Ethernet  HWaddr 00:A0:C9:5A:DF:F7
>           inet addr:10.1.1.1  Bcast:10.1.1.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>           Interrupt:10 Base address:0xdc00 Memory:ef201000-ef201038
> 
> to make this permanent, copy /etc/sysconfig/network-scripts/ifcfg-eth0 to 
> ifcfg-eth0:0 and modify the file contents with the desired info.  you can 
> have several virtual interfaces, all on different subnets.  good luck!
> 
> jason
> 
> On Wednesday 18 June 2003 13:29, Michael Winslow Czeiszperger wrote:
> 
>>Hi--
>>
>>I'm working on a new feature for our load testing product and have been
>>stumped on a Linux configuration issue. The product needs to send out
>>HTTP requests from multiple IP addresses in order to fake out IP-based
>>load balancers. To do this I need to configure a Linux box to have
>>multiple IP addresses on the same network card, but for the life of me
>>I can't find the HOWTO or docs to do this. Strangely enough it seemed
>>fairly easy on Windows :-(
>>
>>Any pointers to the right documentation would be greatly appreciated...
>>
>>Thanks,
>>
>>--------------------------------
>>Michael Czeiszperger
>>czei at webperformanceinc dot com
>>Web Performance, Inc.
>>9207 Baileywick Road, Suite 203
>>Raleigh, NC 27615
>>919-845-7601
>>
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> 
> 
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