We have not tested if the settings actually filter DHCP servers. Let's add a test case for the settings. Note, the .network file used here has been unused since 0730e3767d. So, we can freely reuse it without changing other test cases. Closes #30107.
0730e3767d
Let's make sure these take preference over any generic network config files shipped by the OS (in this case specifically, mkosi).
Yu Watanabe
Daan De Meyer