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I use dhcp for my network connection but I need a static ip that is in the same address pool than the ip of a device I need to connect in the LAN. For this I have set up a network alias in /etc/network/interfaces as following:

auto enp0s31f6
iface enp0s31f6 inet dhcp

auto enp0s31f6:0
iface enp0s31f6:0 inet static
    name Ethernet alias LAN card
    address 192.168.1.20
    netmask 255.255.255.0
    broadcast 192.168.1.255
    network 192.168.1.0

My problem is that every time when I change the network (I take the laptop into different LAN) and I want to connect to Internet, I first need to uncomment the added text in /etc/network/interfaces, then I need to execute "sudo service network-manager restart". After this in the GUI connections there appears to be Wired connection 1 and enp0s31f6, the enp0s31f6 is chosen by default. When I choose the Wired connection 1, I can connect to Internet and that enp0s31f6 option disappears. After this I have to enable the uncommented part in /etc/network/interfaces and execute "sudo service networking restart" to enable the static ip again.

Now my question is that if there is another way to do this that I can change the network and my computer can find the ip automatically without this hassle?

  • What address do you get for the interface enp0s31f6 via DHCP in your home network? – Kev Inski Sep 3 '18 at 6:37
  • I get an address from pool 10.31.***:*** – Pedro Sep 3 '18 at 7:44

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