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Old 08-31-2004, 07:37 AM   #1
Registered: May 2002
Posts: 401

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Problem with two nics


I have a RH 8 machine with two nics, one is in promisc mode.

I think that the cars that is in promisc mode doesnt work well, I also looked at the output of ifconfig -a and saw that they are in the same Interrupt.

Is it should be in this way ? I dont think so... and how to change in if this is the problem?

eth1 Link encap:Ethernet HWaddr 00:A0:24:F0:1D:5D
RX packets:2 errors:0 dropped:0 overruns:1 frame:0
TX packets:0 errors:0 dropped:0 overruns:3 carrier:3
collisions:0 txqueuelen:1000
RX bytes:63190 (61.7 Kb) TX bytes:0 (0.0 b)
Interrupt:11 Base address:0x10c0

eth2 Link encap:Ethernet HWaddr 00:90:27:2F:7F:76
inet addr: Bcast: Mask:
RX packets:1477 errors:0 dropped:0 overruns:0 frame:0
TX packets:490 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:95714 (93.4 Kb) TX bytes:49272 (48.1 Kb)
Interrupt:11 Base address:0x1000 Memory:42100000-42100038

Thanks !!!
Old 08-31-2004, 09:07 AM   #2
Senior Member
Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,991

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If the NICs are PCI cards, then they should be able to share interrupts without any problem. PCI defines a way for a card to be identified (by its position on the bus) after the interrupt is raised, so it does support IRQ sharing. That's always assuming that it's correctly implemented in both of the cards.

In general, interrupts are assigned by the plug and play subsystem of the BIOS when the computer first boots up. It's also possible to assign them through I plug and play kernel module I suspect.

Hope that helps,

Robert J. Lee


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