Ubuntu sets static IP address and dual network card routing configuration

overview

This document mainly records ubuntuthe configuration method of setting the static address of the network card and dual network card routing in the system.

system version

Ubuntu 20.04

Set a static IP address

1. View the network card name

ifconfig -a

2. Modify the network card configuration file

sudo vim /etc/netplan/00-installer-config.yaml

Note: 00-installer-config.yamlThe file name may be different, so modify it according to the actual situation.

3. Modify the content of the configuration file

# This is the network config written by 'subiquity'
network:
  version: 2
  renderer: networkd
  ethernets:
  	enp0s3: # 网卡名称
  		dhcp4: yes
    enp0s8: # 网卡名称
      dhcp4: no
      addresses: [192.168.1.101/24] # 静态IP地址
        gateway4: 192.168.1.1
        nameservers:
          addresses: [192.168.1.1] # 网关地址

Note: enp0s3and enp0s8is the name of the network card, which should be modified according to the actual situation.

4. Make the configuration file take effect

sudo netplan apply

Set up dual network card routing

1. Check the routing table

route -n

2. Add routing

sudo route add -net 0.0.0.0 netmask 0.0.0.0 gw 192.168.1.1 dev enp0s3

Note: The above command is to add a default route, pointing to the Internet, the gateway address is 192.168.1.1, and all data packets enp0s3are sent out through the network card.

3. Delete the route

sudo route del -net 0.0.0.0 dev enp0s3

Description: The above command is to delete the default route pointing to the Internet. All packets are enp0s3routed through the network card and deleted.