Debian 8 Jessie
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Network Settings
2015/05/01
[1] Change to static IP addres if you use Debian as a server.
root@dlp:~#
vi /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
# comment out

#
iface eth0 inet dhcp
# add follows

iface eth0 inet static
address 10.0.0.30
# IP address

network 10.0.0.0
# network address

netmask 255.255.255.0
# subnet mask

broadcast 10.0.0.255
# broadcast address

gateway 10.0.0.1
# default gateway

dns-nameservers 10.0.0.10
# name server
root@dlp:~#
systemctl restart ifup@eth0

[2] Disable IPv6 if not needed.
root@dlp:~#
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf

root@dlp:~#
sysctl -p

net.ipv6.conf.all.disable_ipv6 = 1
root@dlp:~#
eth0      Link encap:Ethernet  HWaddr 00:0c:29:9d:56:58
          inet addr:10.0.0.30  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:346 errors:0 dropped:0 overruns:0 frame:0
          TX packets:263 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:33839 (33.0 KiB)  TX bytes:32449 (31.6 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
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