eth stuff I've learned

Ralphus Maximus · Posted: Thu Aug 08, 2002 5:56 pm Post subject: eth stuff I've learned

After much searching, and help from the folks here, here are some things I've learned that may help other newbies.

The box I'm installing on has the Intel eepro100 card on the motherboard. As I found out, the eepro100 driver is less than desirable. I dropped a 3Com 3c905 card in a slot and restarted the install, calling it eth1. All installed dandy!

When I rebooted, the system could not find eth1. After much hair pulling, I found that the 3Com card is now eth0 and the eepro is eth1.

I re-configured the system for eth0 and all is right with the world.

I'm not sure why they switched positions, but it's something to be aware of.

Cheers,
RM

pjp · Administrator Joined: 16 Apr 2002 Posts: 20067

I think it is IRQ related. See if the IRQ on the new card is lower (or higher?) than the other one. If you can, see what the other/removed card was set. That might give you the answer.

On a side note, be careful with clicking 'submit' and having forum delays. I deleted about 8 or so duplicate posts.
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Ralphus Maximus · Posted: Thu Aug 08, 2002 6:06 pm Post subject:

Thanks for nuking the extras. I thought I only clicked once, maybe our network is acting up.

Cheers,
RM

Sequentious · Posted: Thu Aug 08, 2002 6:17 pm Post subject:

I have the same thing happen to me. It's not an issue, all works fine.

I popped a new NIC into a spare machine i had to turn it into a firewall/gateway for my network. My new NIC was placed in PCI slot 2, whereas the old NIC stayed where it was in PCI slot 3. I had assumed that the new NIC would become eth0, but it didnt.

As i said, its not an issue, i just switched all my eth0's to eth1's in my script, and vice versa. It was interesting to see though, i would agree.
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mksoft · l33t Joined: 28 May 2002 Posts: 844

Do you have the drivers compiled as modules or into the kernel :?:

If you have it compiled as modules, you can control the order of which one is eth0 and eth1 by the loading order of the modules.
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Ralphus Maximus · Posted: Thu Aug 08, 2002 10:35 pm Post subject:

mksoft · l33t Joined: 28 May 2002 Posts: 844

Sequentious · Posted: Thu Aug 08, 2002 10:59 pm Post subject:

How would you do that with two 8139 NICs?
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Chris I
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mksoft · l33t Joined: 28 May 2002 Posts: 844

Sequentious · Posted: Thu Aug 08, 2002 11:29 pm Post subject:

tadman · n00b Joined: 08 Aug 2002 Posts: 4 Location: Toronto

I think they are usually assigned in the order they "appear" on the PCI bus. This could be left to right, or right to left depending on your motherboard and BIOS, but the order should be fairly consistent.

Sequentious · Posted: Fri Aug 09, 2002 12:27 am Post subject: Re: Multiple NICs

tadman · n00b Joined: 08 Aug 2002 Posts: 4 Location: Toronto

Wild guess number two is that they are sorted by MAC address, or astrological sign.

I'm with you in expecting that card to end up as eth0.