networking - Network LAN manual - Ask Ubuntu


i have few problems lan ethernet.

laptop shall nfs server small board, pi. right operating gui network manager , set fix ip enp3s0 (why not eth0 ???).

as metric seems higher wlan, moment don't have connection internet. not network guru, found after several hours - helps change routing 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 few drawbacks. ethernet setting disappears lan connection off, takes while until connection re-established. know, testboard repowered ;)

even worse is, have type routing commands again , again. 2 questions:

  • how can setup ubuntu 16.04 such lan keeps setting if not wired? (read networkmanager.conf, ignore-carrier seems not valid setting).
  • where , how can make routing information static, don't have type in again , again?

routing table after connection lan of laptop 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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