For feisty+1 we plan to switch to using the static device name rules
file, rather than iftab.

The correct behaviour would be that your two new cards get eth2 and
eth3, but don't randomly swap (since eth0 and eth1 were "taken" by your
previous cards).

We can't steal those names back, because we have no way of knowing
whether or not the device should be "present" -- they may be removable
cards that you intend to reactivate later.  The easiest solution is to
give them new names, and require new configuration (a worst case would
be a firewall/server where the machine randomly renumbered everything
after a hardware change and got all the rules wrong)

** Changed in: udev (Ubuntu)
Sourcepackagename: None => udev

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/etc/iftab not updated after hardware change
https://bugs.launchpad.net/bugs/102336
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