james wrote:
After deleting the 70-persistent-net.rule file
udev does not re-create it. All is now fine with rc-status
only showing net.eth0 which is set up how I like it
per /etc/conf.d/net. All services are fine
Beware. The automatic persistent net rules generator is intrinsically
broken because naming eth* devices within the same namespace (eth* to
eth*) can break things horribly. I have had this happen to me on several
occasions and was helping someone out in #gentoo who had experienced the
same issue only recently.
For more information, take a look at this bug:
https://bugzilla.redhat.com/show_bug.cgi?id=782145
Because of this, Kay Sievers has removed the rule generator from later
versions of udev (*). The current version of udev marked stable in
gentoo still has it but it can be disabled by setting
USE="-rule_generator". I've started doing exactly that on my systems
because it has only ever caused problems instead of providing solutions.
Besides which, eventually a version of udev will be stabilized that no
longer has it.
If you want to use persistent net rules, the only safe way of doing it
is to define the rules manually and to rename interfaces in such a
fashion that they don't conflict with the existing device namespace. For
example, you could rename "eth0" to "lan", "eth1" to "dmz" or whatever
is deemed appropriate.
This doesn't appear to be common knowledge, so it struck me as worth
mentioning.
Cheers,
--Kerin
* I cannot recall the exact version off-hand.
