[SOLVED] Wrong elaboration of `/etc/network/interface` by proxmox gui

[Fra]

From a pristine installation of Proxmox pve 6.4 from ISO, with just the following

apt dist-upgrade
reboot
install ifupdown2

I just added a comment in the network configuration from the GUI, and applied. Changes results as follow:

diff  /etc/network/interfaces.original  /etc/network/interfaces
-    bridge_ports enp5s0
-    bridge_stp off
-    bridge_fd 0
+    bridge-ports enp5s0
+    bridge-stp off
+    bridge-fd 0

To me it looks like the GUI makes a wrong change (https://manpages.debian.org/testing/bridge-utils/bridge-utils-interfaces.5.en.html )

# pveversion
pve-manager/6.4-8/185e14db (running kernel: 5.4.119-1-pve)

 

[Fra]

mah, there is apparently not any difference on using `_` vs `-`, can somebody confirm?

 

[BobhWasatch]

External commands are documented in interfaces(5) as being called with environment variables created from options by pretending IF_ and converting - to _. The bridge commands are not built in to ifupdown so the behavior you see is not too surprising.

 

[fabian]

yeah, _ and - are both valid, and we switched to the "new" variant using '-' some time back. the installer was never updated to use the new variant, so you see those additional "changes" which don't actually change anything.

https://lists.proxmox.com/pipermail/pve-devel/2021-June/048998.html

 

[Fra]

thanks, Fabian