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Today, I will talk to you about how to bind multiple IP addresses to a network card in the CentOS system. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

First, let's find the IP address of the network card. In my CentOS 7 server, I only use one network card.

Run the following command with root privileges:

The code is as follows:

Ip addr

Sample output:

The code is as follows:

1: lo: mtu 65536 qdisc noqueue state UNKNOWN

Link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

Inet 127.0.0.1/8 scope host lo

Valid_lft forever preferred_lft forever

Inet6:: 1/128 scope host

Valid_lft forever preferred_lft forever

2: enp0s3: mtu 1500 qdisc pfifo_fast state UP qlen 1000

Link/ether 08:00:27:80:63:19 brd ff:ff:ff:ff:ff:ff

Inet 192.168.1.150/24 brd 192.168.1.255 scope global enp0s3

Valid_lft forever preferred_lft forever

As seen above, my network card name is enp0s3,ip and the address is 192.168.1.150.

As you know, the configuration file for the network card is stored in the / etc/sysconfig/network-scripts/ directory. The details of each network card will be stored under a different name, such as ifcfg-enp0s3.

Let's take a look at the details of ifcfg-enp0s3.

The code is as follows:

Cat / etc/sysconfig/network-scripts/ifcfg-enp0s3

Sample output:

The code is as follows:

TYPE= "Ethernet"

BOOTPROTO= "none"

DEFROUTE= "yes"

IPV4_FAILURE_FATAL= "no"

IPV6INIT= "yes"

IPV6_AUTOCONF= "yes"

IPV6_DEFROUTE= "yes"

IPV6_FAILURE_FATAL= "no"

NAME= "enp0s3"

UUID= "e9f9caef-cb9e-4a19-aace-767c6ee6f849"

ONBOOT= "yes"

HWADDR= "08VOG 00VOUR 27RU 80VOUR 63VOR 19"

IPADDR0= "192.168.1.150"

PREFIX0= "24"

GATEWAY0= "192.168.1.1"

DNS1= "192.168.1.1"

IPV6_PEERDNS= "yes"

IPV6_PEERROUTES= "yes"

OK, now we will assign multiple addresses in the same subnet.

Edit a file

The code is as follows:

/ etc/sysconfig/network-scripts/ifcfg-enp0s3:

Vi / etc/sysconfig/network-scripts/ifcfg-enp0s3

Add an additional IP address as below.

The code is as follows:

TYPE= "Ethernet"

BOOTPROTO= "none"

DEFROUTE= "yes"

IPV4_FAILURE_FATAL= "no"

IPV6INIT= "yes"

IPV6_AUTOCONF= "yes"

IPV6_DEFROUTE= "yes"

IPV6_FAILURE_FATAL= "no"

NAME= "enp0s3"

UUID= "933cdc9b-b383-4ddd-b219-5a72c69c9cf0"

ONBOOT= "yes"

HWADDR= "08:00:27:3F:AB:68"

IPADDR0= "192.168.1.150"

IPADDR1= "192.168.1.151"

IPADDR2= "192.168.1.152"

PREFIX0= "24"

GATEWAY0= "192.168.1.1"

DNS1= "192.168.1.1"

IPV6_PEERDNS= "yes"

IPV6_PEERROUTES= "yes"

As you can see, I have added two IP addresses: IPADDR1= "192.168.1.151" & IPADDR2= "192.168.1.152"

Similarly, you can add more ip addresses.

Finally, save and exit the file. Restart the network service for the changes to take effect.

The code is as follows:

Systemctl restart network

Now, let's check to see if an ip address has been added.

The code is as follows:

Ip addr

Sample output:

The code is as follows:

: lo: mtu 65536 qdisc noqueue state UNKNOWN

Link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

Inet 127.0.0.1/8 scope host lo

Valid_lft forever preferred_lft forever

Inet6:: 1/128 scope host

Valid_lft forever preferred_lft forever

2: enp0s3: mtu 1500 qdisc pfifo_fast state UP qlen 1000

Link/ether 08:00:27:3f:ab:68 brd ff:ff:ff:ff:ff:ff

Inet 192.168.1.150/24 brd 192.168.1.255 scope global enp0s3

Valid_lft forever preferred_lft forever

Inet 192.168.1.151/24 brd 192.168.1.255 scope global secondary enp0s3

Valid_lft forever preferred_lft forever

Inet 192.168.1.152/24 brd 192.168.1.255 scope global secondary enp0s3

Valid_lft forever preferred_lft forever

Inet6 fe80::a00:27ff:fe3f:ab68/64 scope link

Valid_lft forever preferred_lft forever

As you can see, a single network card already has three ip addresses.

Let's ping the new IP address:

The code is as follows:

Ping-c 4 192.168.1.151

Sample output:

The code is as follows:

PING 192.168.1.151 (192.168.1.151) 56 (84) bytes of data.

64 bytes from 192.168.1.151: icmp_seq=1 ttl=64 time=0.048 ms

64 bytes from 192.168.1.151: icmp_seq=2 ttl=64 time=0.075 ms

64 bytes from 192.168.1.151: icmp_seq=3 ttl=64 time=0.077 ms

64 bytes from 192.168.1.151: icmp_seq=4 ttl=64 time=0.077 ms

-192.168.1.151 ping statistics

4 packets transmitted, 4 received, 0% packet loss, time 2999ms

Rtt min/avg/max/mdev = 0.048 ms 0.069 ms 0.077 cusp 0.013

Ping-c 4 192.168.1.152

Sample output:

The code is as follows:

PING 192.168.1.152 (192.168.1.152) 56 (84) bytes of data.

64 bytes from 192.168.1.152: icmp_seq=1 ttl=64 time=0.034 ms

64 bytes from 192.168.1.152: icmp_seq=2 ttl=64 time=0.075 ms

64 bytes from 192.168.1.152: icmp_seq=3 ttl=64 time=0.073 ms

64 bytes from 192.168.1.152: icmp_seq=4 ttl=64 time=0.075 ms

-192.168.1.152 ping statistics

4 packets transmitted, 4 received, 0% packet loss, time 2999ms

Rtt min/avg/max/mdev = 0.034 ms 0.064 ms 0.075 max 0.018

If you want to use a different subnet, you need to change the PREFIX0=24 to a different subnet, such as PREFIX1=16.

For example, I want to add a class An address (* such as 10.0.0.1) to my network card.

The code is as follows:

TYPE= "Ethernet"

BOOTPROTO= "none"

DEFROUTE= "yes"

IPV4_FAILURE_FATAL= "no"

IPV6INIT= "yes"

IPV6_AUTOCONF= "yes"

IPV6_DEFROUTE= "yes"

IPV6_FAILURE_FATAL= "no"

NAME= "enp0s3"

UUID= "933cdc9b-b383-4ddd-b219-5a72c69c9cf0"

ONBOOT= "yes"

HWADDR= "08:00:27:3F:AB:68"

IPADDR0= "192.168.1.150"

IPADDR1= "192.168.1.151"

IPADDR2= "192.168.1.152"

IPADDR3= "10.0.0.1"

PREFIX0= "24"

PREFIX1=16

GATEWAY0= "192.168.1.1"

DNS1= "192.168.1.1"

IPV6_PEERDNS= "yes"

IPV6_PEERROUTES= "yes"

You can see that I have added a Class An address (10.0.0.1) with a prefix of 16.

Save and exit the file. Restart the network service, and then the new address for ping:

The code is as follows:

Ping-c 4 10.0.0.1

Sample output:

The code is as follows:

PING 10.0.0.1 (10.0.0.1) 56 (84) bytes of data.

64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.097 ms

64 bytes from 10.0.0.1: icmp_seq=2 ttl=64 time=0.073 ms

64 bytes from 10.0.0.1: icmp_seq=3 ttl=64 time=0.074 ms

64 bytes from 10.0.0.1: icmp_seq=4 ttl=64 time=0.075 ms

-10.0.0.1 ping statistics-

4 packets transmitted, 4 received, 0% packet loss, time 3000ms

Rtt min/avg/max/mdev = 0.073 ms 0.079 ms

After reading the above, do you have any further understanding of how to bind multiple IP addresses to a network card in the CentOS system? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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