Duel Ethernet card problems?

[zscoundrel]

Perhaps what you are seeing is the results of the DUEL!  One card has 
vanquished the other and has claimed the sole right to communicate!

Charles Steinkuehler wrote:
> Doug Bronson wrote:
> 
>> Hi all.
>> Thanks for the information.
>> I hope nobody minds, but there were so many responses to my query that I
>> decided to reply to all at one time.
>>
>> As you have probably guessed, my problem still exist.
>>
>> Below are copies of some of the responses that were received.
>>
>> In them you will find the answers to the questions that were asked.
> 
> <snip>
> 
>> If I did not answer your question above, please advise me where to look.
> 
> 
> OK, it sounds like your cards are probably working OK, which leaves 
> wacky attempted network configuration as one potential suspect.
> 
> Please draw an ascii-art diagram of your network configuration, and 
> indicate which IP addresses are getting assigned to which cards.
> 
> The output of "ip addr" and "ip route" would also be helpful.  Include a 
> dump of the current firewall rules (ipchains -nvL or iptables -nvL) for 
> good measure as well.
> 
> I'm almost suspecting you're trying to hook all three cards to the same 
> physical network, which causes all sorts of problems with arp, routing, 
> and generally confuses the situation to no end (although it *IS* 
> possbile to setup, if you really need to).  It's also possible something 
> odd is going on with your external network (mac address caching by your 
> cable modem would be one possibility, but without some sort of concept 
> about what your network looks like, I'm literally grasping at 
> straws...and there are no straws nearby! :).
> 
> If the three cards are not on the same network, do you have proper 
> static routes in place where required, and valid firewall rules allowing 
> the desired traffic?
>