Hi Nathalie,

It is OK to use the same ethernet address on both cards.  However, you 
don't want them (i.e. the 2 ethernet cards) to be up (or active) at the 
same time, since that would confuse whoever on your machine is using the 
network about which network interface (should one use eth0 or eth1?).  Make 
sure that you only have one ethernet card to be in the "up" state.  You can 
use the ifconfig command to set a network interface to be either "up" or 
"down".  You can accomplish the same by setting the interface "active" or 
"inactive" by using the GUI "Network Configuration" (Gnome -> Programs-> 
System -> Network Configuration).

Suppose you have eth0 "up" but eth1 "down".  If eth0 does indeed fail, you 
simply bring eth0 down, and then bring eth1 up, again using the ifconfig 
command or the "Network Configuration" GUI.  This is not "automatic", but I 
think it should work well enough in most cases.  If you're worry about the 
network card going down during the off-hours (evenings, weekends) then 
write a cron job to periodically check the active network interface (e.g. 
if you can ping some known computer in your network), and if the network is 
not responding, then use ifconfig to switch network cards.

... Edwin

At 09:21 AM 10/3/02 +0200, you wrote:
>Hello all,
>
>I have a RH7.1 box with 2 ethernet cards.
>I need to implement redundancy on the network: in case one of the eth 
>cards fails, the second will automatically replace it with the same IP (No 
>DNS redundancy).
>
>Is it sufficient to give both cards the same IP address?
>
>Thanks for your help.
>
>Regards
>
>Nathalie
>
>
>
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