I have a few problems with LAN Ethernet.
Laptop shall be NFS server for a small board, like Pi. Right now I am operating with GUI Network manager and set a fix IP to my enp3s0 (why not eth0 ???).
As metric seems to be higher than WLAN, from that moment I don't have connection to internet. I am not a network guru, but what I found after several hours - it helps to change routing that way:
sudo route add -host <IP BOARD> (192.168.3.102) dev enp3s0
sudo route del -net 192.168.3.0 netmask 255.255.255.0 dev enp3s0
That has a few drawbacks. As ethernet setting disappears as soon as LAN connection is off, it takes a while until connection is re-established. You know, a testboard will often be repowered ;)
Even worse is, that I have to type routing commands again and again. So two questions:
- How can I setup Ubuntu 16.04 such that the LAN keeps its setting even if not wired? (Read about NetworkManager.conf, but ignore-carrier seems not to be a valid setting).
- Where and how can I make this routing information static, so that I don't have to type it in again and again?
Routing table after connection LAN of Laptop with board is:
default 192.168.3.1 0.0.0.0 UG 100 0 0 enp3s0
default 192.168.3.1 0.0.0.0 UG 600 0 0 wlp2s0
link-local * 255.255.0.0 U 1000 0 0 wlp2s0
192.168.3.0 * 255.255.255.0 U 100 0 0 enp3s0
192.168.3.0 * 255.255.255.0 U 600 0 0 wlp2s0
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