Stéphane, the following is an extract from my /etc/network/interfaces:
auto eth0
iface eth0 inet static
address 10.0.0.251
netmask 255.255.255.0
...
auto ppp0
iface ppp0 inet ppp
pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf
provider internode
as you can see, I do have it named "ppp0".
Is the reason why the problem doesn't occur with other names that the
$INTERFACES argument passed to /etc/init/network-interface.conf will
always be "ppp0" and so if you have a name other than ppp0 in interfaces
then it will ignore the unknown interface?
In my opinion, it is more consistent to configure ppp (especially pppoe)
interfaces to always use the same pppX interface and also be configured
as such in /etc/network/interfaces. That way if you "ifup ppp0" you know
you're bringing up "ppp0". Running "ifup myprovider" or such and having
the next available pppX interface come up isn't ideal for several
reasons, the first being that it makes firewall configuration difficult
if there is a chance that an interface will come up differently each
time (imagine the case where you have to ppp interfaces and you want to
firewall them differently).
Also, in your suggestion, you don't include "auto ppp0" which as far as I know
is required to bring the interface up on boot and is how pppoe-conf will set up
the interface if you request it to automatically come up on boot.
An alternative would be to have a post-up command as Teemu proposes, however
this is not how pppoe-conf sets up the interface.
If the solution is to set up ppp interfaces as proposed by Teemu then I
would suggest pppoe-conf needs to be changed to configure interfaces in
the same way.
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https://bugs.launchpad.net/bugs/78043
Title:
udev stops pppd persist working
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