On Wed, 6 Oct 2021 at 23:09, Pierre Frenkiel <pierre.frenk...@gmail.com> wrote: > > please note that the main problem is > "why the /etc/network/interfaces" is not used?"
Ok. Noted. Several knowledgeable and helpful people have already made an effort trying to help you answer exactly this. You can find those efforts in the 4 links labelled "Follow-Ups" at the bottom of this web page: https://lists.debian.org/debian-user/2021/10/msg00244.html If you do not engage with those efforts then it really is a puzzle to understand what kind of help you expect when you write to this list. Should we conclude that you prefer to solve this without our assistance? If that is the case, you could do the following: First, learn what DHCP is. Second, learn what all the commands (that others have suggested in the links above) do, and how to understand their outputs. Third, use those commands to answer the question yourself. If that is not the case, then perhaps you could explain what kind of help you do expect when you ask a question here.