My server (it has 2-CPU) has two Intel Gigabit netcard, and I added a DFE-530TX netcard, the OS is Redhat AS 2.1, their IP are 192.168.3.100, 192.168.3.101, 192.168.3.102 respectively. Only when the 192.168.3.102 was link to network, I can ping 192.168.3.138( other machine ), other two nic can not do so.
I have edited /etc/modules.conf and /etc/sysconfig/networ-scripts/ifcfg-ethN, but the problem can not be resolved.

When I typed route command, it displays following:

Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 * 255.255.255.0 U 0 0 0 eth2
192.168.3.0 * 255.255.255.0 U 0 0 0 eth1
192.168.3.0 * 255.255.255.0 U 0 0 0 eth2
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default my.router 0.0.0.0 UG 0 0 0 eth0

Anybody can help me?

@mycmos

please show the output of ur ifconfig command and content of ifcfg-ethN files. so that i can make some ideas to help u.



-Akshat

Chinaman, the link you referred to is loop and not useful. Can you copy those contents here?

You posted at least 4 times ~

http://www.linuxquestions.org/questi...hreadid=249650
http://www.linuxquestions.org/questi...hreadid=249673
http://www.linuxquestions.org/questi...hreadid=249666
http://www.linuxquestions.org/questi...hreadid=249661

I was trying to make a loop out of all your posts, but messed up. Oh, well...

You agreed to the rules, but started off breaking them.

I am sorry I have made so many identical issues. Now I will take this place as the only discussion area.

I would suggest taking a look at the route table (type 'route') You might just find that traffic for the local network is set to use eth0 only. That one has caught me out once or twice!

Question is, why have you got three network cards all on the same network? You know you can set more than one address on a single card?


HTH

Dylan

Now I have got a resolution : If every netcard has been connected to cable , then the problem would disappear. Thank for your help!

@mycmos

I think is not the proper solution. Try this, put the cable from 1 nic (let say eth0) and put the cable now in nic(let say eth1) and the

run a command for a while,
#ifdown eth0

#ifup eth1

and check whether now u r able to ping or not.


-Akshat

Sorry, I can not know your exact means. However I can assure the problem is raised by route table: it shoud be setup manully.
If 3 nic were configured 192.168.1.1, 192.168.2.1,192.168.3.1, all nic can ping other machines , such as 192.168.1.1-->192.168.1.2 , 192.168.2.1-->192.168.2.2, 192.168.3.1-->192.168.3.2 .

Only way to make full use of 3 NIC is to use load balancing. Even when using that you would need to have the three NICs connected to different ports on a gigbit switch, or else you won't gain anything. It would only cause overhead to determine which card to send packets to, only to find that the wire was busy from trafic from one of the other cards.