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Installed debian 9 for the first time.
Problem: I've two nics enp9s0 and enp11s0, whenever I try to enable enp11s0 it copies enp9s0's ip and configuration.
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
#Secondary
iface enp11s0 inet static
address 192.168.1.179
netmask 255.255.255.0# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
I'm just an amateur at networking but the first thing I'd do/etc/network/interfaces.d is remove everything above the second "source /etc/network/interfaces.d/*". You have repeats in there. Start by getting the primary working properly. Then you can tinker with the secondary.
Is this the exact contents of /etc/network/interfaces ? It looks like you pasted it twice.
For now I am failing to understand what your problem is, information is missing or too vague.
Notes :
You must not have multiple "gateway" options on one interface.
You must not have multiple "gateway" options on interfaces which may be activated at the same time.