如何在Ubuntu系统中添加一个辅助IP地址

此外，我们不需要添加子接口（我们之前在 Ubuntu 14.04 LTS 中的做法）：

# vi /etc/network/interfaces
 
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
 
# The primary network interface
auto enp0s3
iface enp0s3 inet static
address 192.168.56.201
netmask 255.255.255.0
 
iface enp0s3 inet static
address 192.168.56.202
netmask 255.255.255.0
 
gateway 192.168.56.1
network 192.168.56.0
broadcast 192.168.56.255
dns-nameservers 8.8.8.8 8.8.4.4
dns-search      2daygeek.local  

保存并关闭文件，然后重启网络接口服务：

# systemctl restart networking
或
# ifdown enp0s3 && ifup enp0s3

运行以下命令来检查是否已经分配了新的 IP：

# ip addr
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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 group default qlen 1000
    link/ether 08:00:27:97:13:2e brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.201/24 brd 192.168.56.255 scope global enp0s3
       valid_lft forever preferred_lft forever
    inet 192.168.56.202/24 brd 192.168.56.255 scope global secondary enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe97:132e/64 scope link
       valid_lft forever preferred_lft forever
3: enp0s8:  mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:12:e8:c1 brd ff:ff:ff:ff:ff:ff
    inet 10.0.3.15/24 brd 10.0.3.255 scope global dynamic enp0s8
       valid_lft 86353sec preferred_lft 86353sec
    inet6 fe80::344b:6259:4dbe:eabb/64 scope link
       valid_lft forever preferred_lft forever

让我来 ping 一下新 IP 地址：

# ping 192.168.56.202 -c 4
PING 192.168.56.202 (192.168.56.202) 56(84) bytes of data.
64 bytes from 192.168.56.202: icmp_seq=1 ttl=64 time=0.019 ms
64 bytes from 192.168.56.202: icmp_seq=2 ttl=64 time=0.087 ms
64 bytes from 192.168.56.202: icmp_seq=3 ttl=64 time=0.034 ms
64 bytes from 192.168.56.202: icmp_seq=4 ttl=64 time=0.042 ms
 
--- 192.168.56.202 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3068ms
rtt min/avg/max/mdev = 0.019/0.045/0.087/0.026 ms

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