Debian Bring Manually Configured Interface Up at Boot/Reboot

Edit /etc/network/interfaces and make following changes:

1.Add interface to auto line (your interface name may change and number of interfaces may also change). This change makes interface to be brought up at boot time:

auto lo eth0 eth1 eth2

2.Add following lines for each interface. This change will make interface to be manually configured:

iface eth1 inet manual
   pre-up /sbin/ifconfig $IFACE up
   post-down /sbin/ifconfig $IFACE down

reboot and see your changes.

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