Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: network-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1747085
Title:
NetworkManager: setting wifi.cloned-mac-address from pre-up.d fails
silently for new connections
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
network-manager 1.2.6-0ubuntu0.16.04.2
I'm using a script in /etc/NetworkManager/dispatcher.d/pre-up.d to
assign a pseudorandom mac address using the cloned-mac-address setting
(via this command):
> nmcli connection modify <connection uuid> wifi.cloned-mac-address
<mac>
(Specifically, I'm using this script:
https://gist.github.com/paulfurley/46e0547ce5c5ea7eabeaef50dbacef3f)
This works a treat for existing connections - ifconfig shows that the MAC
address has been assigned correctly (as denoted by the leading 02):
```
$ ifconfig wlp6s0
wlp6s0 Link encap:Ethernet HWaddr 02:2a:8b:4e:ca:ef
```
However if I delete that connection from Network Manager and add it
again, the interface comes, leaking its real hardware mac address:
```
$ ifconfig wlp6s0
wlp6s0 Link encap:Ethernet HWaddr b0:35:9f:XX:XX:XX
```
Theory 1: Maybe pre-up.d hooks don't run for new connections? Nope - I
can see from the logs that the script definitely runs when I connect
to the wifi for the first time.
Theory 2: Maybe the Network Manager connection doesn't exist yet, so
the script can't see it via its initial `nmcli connection show`
command? Nope - at the top of the log is the command `nmcli connection
modify <uuid of the new connection> wifi.cloned-mac-address
02:34:ae:08:7d:5f`
So, in summary, setting wifi.cloned-mac-address from a pre-up.d hook
works great for *existing* connections but appears to fail silently
for *new* connections.
Thanks!
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