Multiple ethernet adapters with same IP
Giacomo Pasinetti
switch. I load both as modules(eth0 and eth1 ok) ,but I can set only the
first to 100 MB full duplex (adding options=5 to the insmod line of
rc.modules).
After that I want to assign the same Ip address to both cards and I have
changed rc.inet1 to assign to eth1 the same address.
The activity led of the cards works good; but if I do an ifconfig I see
that works only eth0. Why ? how i can do?
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jo...@kill.spam.omsmotion.com
I just have to know.... Why in the world would you want to do that?!?
I don't think you can... IPs are supposed to be unique.
Jon
On Thu, 07 Oct 1999 13:31:43 GMT, Giacomo Pasinetti <gia...@tnet.it>
wrote:
Cowles, Steve
to assign multiple NIC's the same IP address is to load balance network traffic.
Unfortunately, I'm not aware of any drivers (for Linux) that allow this capability. In the
NT world, both 3Com and Intel have drivers that allow you to accomplish this task. In
fact, I just finished a contract where I configured 8 Dell servers with 4 NIC cards a
piece and bound 1 IP address to all four NIC's. Needless to say, my understanding of the
OSI model went out the door on this one (at least at first!).
The way Intel accomplishes this is through their device driver. In essence, it creates a
"virtual" adapter which contains the NIC cards that you assign to be load balanced
("teaming" as Intel calls it). Then when you go into the protocols tab, you will see the
virtual adapter when you select TCP/IP protocol. Trust me, it blew me away at first!!! But
it works, and it works well.
To illustrate just how effective this load balancing is (beleive me, I was skeptical at
first). My customer had a video streaming server with one NIC card originally. When their
videos were broadcast across the LAN/WAN (over 50 sites), the receiving end always had
"choppy" video reception. Once I reconfigured this system with 4 NIC cards bound to one IP
(load balancing), the video streaming was crystal clear. Originally, I thought this was a
QoS related problem. Especially for the remote sites across the WAN. But my customer
assured me their routers Qos was setup properly. Which it was.
If your interested in downloading the Intel driver for NT...
http://support.intel.com/support/network/adapter/pro100/pro100i/100vdisk.htm
I just hope Donald Becker can find some time to write the equivalent driver for the Linux
world. I know I'm a believer now. Donald....
Steve Cowles
SWCowles at gte dot net
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