It seems like /etc/iftab is gone on (x)ubuntu 7.10.
In fact, it is… but the mapping is now handled by udev.

Update: /etc/iftab/ is missing on (x)ubuntu 8.04, 8.10, 9.04 and 9.10 as well.

So if you want to assign persistent names to devices, just fire up an editor with the file

-$ sudo nano /etc/udev/rules.d/70-persistent-net.rules net.rules

and you will see something like this:

udev-rules for network mapping

Change the entries of the appropriate macs to something you like. I changed the name of my wired lan (eth0 above)  to lan1 and my wireless lan(eth1 above) to wlan1 as I like to start counting with one.

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