There is a file in which I can set from what interfaces dhcp can provide ip and etc.
there was a line like this
interface = "eth0 eth1"
What is the file's name?
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The file you're looking for is:
You can find a reference for the structure of this file by taking a look at
Your question is a bit confusing, but allow me to but on my mind reading cap for a bit and make a few guesses.
I am guessing that you are running the ISC DHCPd server that comes as a package. It has several files related to the configuration and startup