Can you please transfer this to the ifupdown package?
Or should I just resubmit it from scratch?
The discussions of the importance of ifconfig are beside the point.
The problem presented itself during boot-up, in connection with
an "auto dummy0" directive in /etc/network/interfaces.
If "auto dummy0" and "ifup dummy0" are not maintained then why
bother to have a dummy device at all? This is the most important
context, although there are MANY others. I reported the ifconfig
context because it is the /simplest/ ... not the only manifestation.
And no, I'm definitely not the first person to encounter the bug.
I'm just the first to report it through this channel. My first
message in this thread linked to a report that came up in another
context.
As for the software versions:
I must have typed the "apt-cache policy net-tools" in the wrong
window at one point. As stated before that and after that, the
fact is that bionic is buggy while xenial is not. Specifically,
the buggy packages are:
:; apt-cache policy net-tools
net-tools:
Installed: 1.60+git20161116.90da8a0-1ubuntu1
Candidate: 1.60+git20161116.90da8a0-1ubuntu1
Version table:
*** 1.60+git20161116.90da8a0-1ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
100 /var/lib/dpkg/status
and perhaps more to the point:
:; apt-cache policy ifupdown
ifupdown:
Installed: 0.8.17ubuntu1.1
Candidate: 0.8.17ubuntu1.1
Version table:
*** 0.8.17ubuntu1.1 500
500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
100 /var/lib/dpkg/status
0.8.17ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to net-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1828749
Title:
ifconfig dummy0 : Device not found
Status in net-tools package in Ubuntu:
New
Bug description:
Desired behavior:
The ifconfig command should be able to deal with the
dummy device. This worked fine until recently.
Observed behavior:
:; ifconfig dummy0
dummy0: error fetching interface information: Device not found
This problem appeared when I upgraded to bionic.
Highly informative workaround:
:; ip link add dummy0 type dummy
That command works, and makes the problem go away permanently.
The ifconfig command works fine after that.
The ifup and ifdown commands also work fine after that.
For convenient debugging, you can use the command:
:; ip link del dummy0 type dummy
which makes the problem come back.
You can also experiment with dummy1 et cetera.
Package ownership issues:
Compare: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=909204
That report was filed against ippusbxd, which is almost certainly
not the relevant package.
For that matter, I have no idea whether the root cause is in the
net-tools package or the kernel networking stack. All I know is
the ip command plays nicely with the kernel while the ifconfig
command does not.
Notes:
The kernel module for the dummy interface is preloaded in
all situations described here. That's not the issue.
An apport file is attached, to describe the environment.
Also, since you asked:
:; apt-cache policy net-tools
net-tools:
Installed: 1.60-26ubuntu1
Candidate: 1.60-26ubuntu1
Version table:
*** 1.60-26ubuntu1 500
500 http://ubuntu.cs.utah.edu/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
:; lsb_release -rd
Description: Ubuntu 16.04.6 LTS
Release: 16.04
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/net-tools/+bug/1828749/+subscriptions
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