I know that if I need to assign a static ip address I will need to use
netplan in Ubuntu 18.04, and I have done exactly that and made it work.
Here is my config file:
network: version: 2 renderer: networkd ethernets: eno1: dhcp4: yes enp131s0f0: dhcp4: no addresses: [10.66.0.1/24]
After I use
netplan apply, the
ifconfig command shows the ip address of
enp131s0f0 set to
10.66.0.1 after I plug the cable into the port for "enp131s0f0". This causes a problem because if I do not plug in the cable to this port, the port itself won't get a static ip address even if the ipaddress is set in netplan, this will cause some services to fail to start (eg, isc-dhcp-server).
For example, if you have 3 ports and you have configured them like so:
network: version: 2 renderer: networkd ethernets: enp131s0f0: dhcp4: no addresses: [10.66.0.1/24] enp131s0f1: dhcp4: no addresses: [10.66.1.1/24] enp131s0f2: dhcp4: no addresses: [10.66.2.1/24] enp131s0f3: dhcp4: no addresses: [10.66.3.1/24]
If isc-dhcp-server is installed on all these 3 ports. The isc-dhcp-server will start only if you connect all 3 ports, if you failed to connect your cable to any one port of these 3 ports the isc-dhcp-server will fail to start because the port does not have a static address (without the cable plugged into the port), even if you set the static ip address in netplan.
So I would like to ask how to permanently assign a static address to a net port. To make it have an ipaddress before I plug in the cable... I need this because there are some ports on my server that currently I do not use (the cable is left unplugged), but I need isc-dhcp-server to start...