配置interfaces

demo1

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto enp1s0
iface enp1s0 inet manual
auto enp2s0
iface enp2s0 inet manual
auto enp3s0
iface enp3s0 inet manual 
auto enp4s0
iface enp4s0 inet dhcp 

auto br1
iface br1 inet static
　　bridge_ports enp1s0 enp2s0 enp3s0
　　gateway 192.168.10.1
　　broadcast 192.168.10.255
　　netmask 255.255.255.0
　　address 192.168.10.2

demo2

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual
auto eth1
iface eth1 inet manual
auto eth2
iface eth2 inet manual

#auto eth3
#iface eth3 inet dhcp

auto eth3
iface eth3 inet static
address 192.168.1.101
gateway 192.168.1.1
netmask 255.255.255.0

auto br0
iface br0 inet static
    bridge_ports eth0 eth1 eth2
    gateway 192.168.99.1
    broadcast 192.168.99.255
    netmask 255.255.255.0
    address 192.168.99.2