现在，让我们来分配一个额外的地址，例如 192.168.1.104/24。

编辑 /etc/network/interfaces：

1. sudonano/etc/network/interfaces

如下添加额外的 IP 地址。

1. #Thisfile describes the network interfaces available on your system
2. #and how to activate them.Formore information, see interfaces(5).
3. source /etc/network/interfaces.d/*
4. # The loopback network interface
5. auto lo
6. iface lo inet loopback
7. # The primary network interface
8. auto enp0s3
9. iface enp0s3 inet dhcp
10. iface enp0s3 inet static
11. address 192.168.1.104/24

保存并关闭文件。

运行下面的命令使更改无需重启即生效。

1. sudo ifdown enp0s3 &&sudo ifup enp0s3

样例输出：

1. Killed old client process
2. InternetSystemsConsortium DHCP Client4.3.1
3. Copyright2004-2014InternetSystemsConsortium.
4. All rights reserved.
5. Forinfo, please visit https://www.isc.org/software/dhcp/
6. Listening on LPF/enp0s3/08:00:27:2a:03:4e
7. Sending on LPF/enp0s3/08:00:27:2a:03:4e
8. Sending on Socket/fallback
9. DHCPRELEASE on enp0s3 to 192.168.1.1 port 67(xid=0x225f35)
10. InternetSystemsConsortium DHCP Client4.3.1
11. Copyright2004-2014InternetSystemsConsortium.
12. All rights reserved.
13. Forinfo, please visit https://www.isc.org/software/dhcp/
14. Listening on LPF/enp0s3/08:00:27:2a:03:4e
15. Sending on LPF/enp0s3/08:00:27:2a:03:4e
16. Sending on Socket/fallback
17. DHCPDISCOVER on enp0s3 to 255.255.255.255 port 67 interval 3(xid=0xdfb94764)
18. DHCPREQUEST of 192.168.1.103 on enp0s3 to 255.255.255.255 port 67(xid=0x6447b9df)
19. DHCPOFFER of 192.168.1.103from192.168.1.1
20. DHCPACK of 192.168.1.103from192.168.1.1
21. bound to 192.168.1.103-- renewal in35146 seconds.

注意：如果你从远程连接到服务器，把上面的两个命令放到一行中非常重要，因为第一个命令会断掉你的连接。而采用这种方式可以保留你的 ssh 会话。

现在，让我们用下面的命令来检查一下是否添加了新的 IP：

1. sudoip address show enp0s3

输出样例：

1. 2: enp0s3: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
2. link/ether 08:00:27:2a:03:4e brd ff:ff:ff:ff:ff:ff
3. inet 192.168.1.103/24 brd 192.168.1.255 scope global enp0s3
4. valid_lft forever preferred_lft forever
5. inet 192.168.1.104/24 brd 192.168.1.255 scope global secondary enp0s3
6. valid_lft forever preferred_lft forever
7. inet6 fe80::a00:27ff:fe2a:34e/64 scope link
8. valid_lft forever preferred_lft forever

很好！我们已经添加了额外的 IP。

再次 ping IP 地址进行验证。

1. sudoping192.168.1.104

样例输出：

1. PING 192.168.1.104(192.168.1.104)56(84) bytes of data.
2. 64 bytes from192.168.1.104: icmp_seq=1 ttl=64time=0.137 ms
3. 64 bytes from192.168.1.104: icmp_seq=2 ttl=64time=0.050 ms
4. 64 bytes from192.168.1.104: icmp_seq=3 ttl=64time=0.054 ms
5. 64 bytes from192.168.1.104: icmp_seq=4 ttl=64time=0.067 ms

好极了！它能正常工作。就是这样。