ubuntu20.04 Multi-network port configration，router,netplan

halejohn wang

3/2/24, 11:20 AM

my ubuntu20.04 server have four network ports，I want my server to act as a router. If one network port is connected to the gateway, other devices can connect to the server through other network ports.

However, the IP addresses of these devices are assigned by the gateway.

This is the netplan configuration I wrote, but an error was thrown when using the netplan try command.

root@ubuntu-server:/etc/netplan# sudo netplan --debug try

ERROR:Error while loading /etc/netplan/eno1.yaml, aborting.

network:        
version: 2
renderer: networkd
ethernets: 
  eno1: {}
  enp1s0: {}
  enp2s0: {}
  enp4s0: {}
    addresses: 
      - 192.168.2.8/24
    gateway4: 192.168.2.1
    nameservers:
      addresses: [114.114.114.114,8.8.8.8]
bridges:
  br0:
    dhcp4: yes
    interfaces:
      - enp1s0
      - enp2s0
      - enp4s0

This is the network topology

0 + 1

networking

20.04

paladin

3/15/24, 2:33 PM

What you want to create is not a router but a bridge. You configure all network interfaces to use automatic IP configuration, then you wait until one of your network interfaces has received a working IP configuration with gateway and etc., then you reconfigure that primary network device to act as bridge for the remaining network devices. Take a look here: [https://www.ubuntupit.com/how-to-configure-and-use-network-bridge-in-ubuntu-linux](https://www.ubuntupit.com/how-to-configure-and-use-network-bridge-in-ubuntu-linux)

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