Networkmanger
https://wiki.debian.org/NetworkConfiguration
NetworkManager saves these settings in:
/etc/NetworkManager/system-connections/name-of-connection.
Example:
/etc/NetworkManager/system-connections/Wired\ connection\ 1
https://wiki.debian.org/NetworkConfiguration
NetworkManager saves these settings in:
/etc/NetworkManager/system-connections/name-of-connection.
Example:
/etc/NetworkManager/system-connections/Wired\ connection\ 1