[ILUG] Network interface order

[Dermot McGahon]

On Fri, 14 May 2004 17:59:06 +0100, <P at draigBrady.com> wrote:

> Across boots it shouldn't change so you can always
> just hardcode the renaming in a script using
>      ip link set dev eth0 name lan
>      ip link set dev eth1 name dmz
>      ip link set dev eth2 name wan

This will work. What you're doing though, is "play-testing"
the boot order once and relying on it not to change, and
labelling the cables or interfaces based on what you find
out.

> You can do it based on MAC address using nameif
> to handle the case where adding cards changes
> the ordering, though I've never had to handle
> that situation.

A more solid way to do this, may be to assign ip address
using dhcp based on the mac address (fixed dynamic). This
gives you a slot to ip address fixed ordering and in a way
takes eth0/eth1 out of the picture. As long as you know
that bottom nic is ip address x, and top nic is ip address
y, then you can plan the switchover procedure.

At this point I think it shouldn't really matter which is
eth0, which is eth1.


Dermot.
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