CentOS8 Stream network card configuration operation

Published: 2022-02-22

CentOS8 has deprecated network.service. Network interface operations require nmcli. This article organizes configuration file operations and related commands.

Command:nmcli

Configuration file: /etc/sysconfig/network-scripts/ifcfg-eth0

Configuring a single IPv4 address

IP:60.247.159.221 Netmask: 255.255.255.0 Gateway: 60.247.159.1

[root@ebs-113436 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0

# Declare NIC eth0 
DEVICE=eth0
BOOTPROTO=static
IPADDR=60.247.159.221
NETMASK=255.255.255.0
GATEWAY=60.247.159.1
TYPE=Ethernet
ONBOOT=yes

Configuring multiple IPv4 addresses

IP1:60.247.159.221 Netmask1: 255.255.255.0 Gateway1: 60.247.159.152

IP2:60.247.159.221 Netmask2: 255.255.255.0
For multiple IP configuration, generally only one GATEWAY0 gateway needs to be configured.

[root@ebs-113436 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0

# Declare NIC eth0 
DEVICE=eth0
BOOTPROTO=static
TYPE=Ethernet
ONBOOT=yes
IPADDR0=60.247.159.221
IPADDR1=60.247.159.152 
NETMASK0=255.255.255.0
NETMASK1=255.255.255.0
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GATEWAY0=60.247.159.1

Add the rest in sequence; if there are many IPs, add them as an IP range.

First usehttp://tool.520101.com/wangluo/ipjisuan/ to calculate the IP addresses

The first and last usable IP suffix numbers are 193 and 254, and the netmask is 255.255.255.192. Also note the network connection name on the server, then add:

for I in $(seq 193 254); do nmcli con mod eth0 +ipv4.addresses 192.168.1.${I}/26; done

Single IPv6 configuration

IPv4: 60.247.159.221 Netmask: 255.255.255.0 Gateway: 60.247.159.1
IPv6: 240E:D9:C200:160:9404::1A80 Prefix length: 64 Gateway: 240e:d9:c200:160::1

[root@ebs-113436 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0

# Declare NIC eth0 
DEVICE=eth0
BOOTPROTO=static
IPADDR=60.247.159.221
NETMASK=255.255.255.0
GATEWAY=60.247.159.1
TYPE=Ethernet
ONBOOT=yes
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6ADDR=240E:D9:C200:160:9404::1A80/64
IPV6_DEFAULTGW=240e:d9:c200:160::1

Multiple IPv6 configuration

IPv4: 60.247.159.221 Netmask: 255.255.255.0 Gateway: 60.247.159.1
IPv6: 240E:D9:C200:160:9404::1A80-240E:D9:C200:160:9404::1a9f Prefix length: 64 Gateway: 240e:d9:c200:160::1

[root@ebs-113436 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0

# Declare NIC eth0 
DEVICE=eth0
BOOTPROTO=static
IPADDR=60.247.159.221
NETMASK=255.255.255.0
GATEWAY=60.247.159.1
TYPE=Ethernet
ONBOOT=yes
# IPv6 configuration
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6ADDR=240E:D9:C200:160:9404::1A80/64
IPV6_DEFAULTGW=240e:d9:c200:160::1
# Multiple IPv6 configuration,  separated by spaces
IPV6ADDR_SECONDARIES="240E:D9:C200:160:9404::1a80/64  240E:D9:C200:160:9404::1a81/64  240E:D9:C200:160:9404::1a82/64  240E:D9:C200:160:9404::1a83/64  240E:D9:C200:160:9404::1a84/64  240E:D9:C200:160:9404::1a85/64  240E:D9:C200:160:9404::1a86/64  240E:D9:C200:160:9404::1a87/64  240E:D9:C200:160:9404::1a88/64  240E:D9:C200:160:9404::1a89/64  240E:D9:C200:160:9404::1a8a/64  240E:D9:C200:160:9404::1a8b/64  240E:D9:C200:160:9404::1a8c/64  240E:D9:C200:160:9404::1a8d/64  240E:D9:C200:160:9404::1a8e/64  240E:D9:C200:160:9404::1a8f/64  240E:D9:C200:160:9404::1a90/64  240E:D9:C200:160:9404::1a91/64  240E:D9:C200:160:9404::1a92/64  240E:D9:C200:160:9404::1a93/64  240E:D9:C200:160:9404::1a94/64  240E:D9:C200:160:9404::1a95/64  240E:D9:C200:160:9404::1a96/64  240E:D9:C200:160:9404::1a97/64  240E:D9:C200:160:9404::1a98/64  240E:D9:C200:160:9404::1a99/64  240E:D9:C200:160:9404::1a9a/64  240E:D9:C200:160:9404::1a9b/64  240E:D9:C200:160:9404::1a9c/64  240E:D9:C200:160:9404::1a9d/64  240E:D9:C200:160:9404::1a9e/64  240E:D9:C200:160:9404::1a9f/64"

IPv6 batch configuration tutorialhttps://www.west.cn/faq/list.asp?unid=2276

After the above configuration, you need to restart the network card for it to take effect;

Network service restart

# View network card names
[root@ebs-113436 ~]# nmcli c
NAME         UUID                                  TYPE      DEVICE 
System eth0  5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03  ethernet  eth0   
System eth1  9c92fad9-6ecb-3e6c-eb4d-8a47c6f50c04  ethernet  eth1  
# Restart network service
[root@ebs-113436 ~]# nmcli c reload "System eth0"
[root@ebs-113436 ~]# nmcli c up "System eth0"

# If it does not take effect
[root@ebs-113436 ~]# nmcli device reapply eth0
[root@ebs-113436 ~]# nmcli device connect eth0