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root@debian13:~# cat /etc/network/interfaces
# 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
allow-hotplug eth0
iface eth0 inet dhcp
metric 99  # 优先级低越优先

allow-hotplug eth1
iface eth1 inet static
  address 192.168.44.2
  netmask 255.255.255.0
  # gateway 192.168.44.1
  metric 100
root@debian13:~#