Suppose you have a system with 3 Intel and 3 3Com NICs. The first factor is
the order in which drivers are loaded in SPLAT (and any Linux distro). If
the Intel driver gets loaded before the 3Com driver, then the Intel cards
will be enumerated before the 3Com ones. The second factor is the hardware
addresses those interfaces receive from the system (I suppose you use PCI
cards and not old ISA :). In this system eth0 will be the first Intel NIC
that is detected by the system (the one which has the lowest hardware
address), eth1 will be the second Intel NIC, eth3 will be the first 3Com NIC
and so on. Usually systems assign hardware addresses to PCI devices in the
order they enumarate them during POST, based on which slot they are located
(PCI1, PCI2 etc). Some BIOSes give you the option to manually change the
order in which PCI slots get enumerated.

I think I have seen a sample of /etc/modules.conf (if I remember correctly)
somewhere on the Internet, where you can change the name given to a NIC
device by using the alias command. But I have never ever needed to do
something like that and I did not fiddle with it.

On 04/01/06, Shane Presley <[EMAIL PROTECTED]> wrote:
>
> Hello,
>
> I have a Dell 2800 with 4 PC quad cards installed.  So 4 quad cards,
> plus the 2 onboard interfaces, means I should have 18 interfaces.
> (Incase you're wondering, this is a firewall with lots of small lab
> networks, and VLANs are not allowed by our security policy).
>
> Anyway, this is running CheckPoint SecurePlatform NGX.
>
> What determines the order it detects the interfaces?  In the OS, my
> interfaces came up:
>
> quad card slot1:  eth0 eth1 eth2 eth3
> quad card slot2:  eth4 eth5 eth6 eth7
> quad card slot3:  eth12 eth13 eth14 eth15
> quad card slot4:  eth8 eth9 eth10 eth11
> onboard:  eth16 eth17
>
> I thought it was odd that the quads in slots3 and slots4 were
> reversed?  Any idea why that might be, or how to control that?
>
> Thanks
> Shane
>
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