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I installed debian 9 and everything was working perfectly -- I was able to discover networks around and connect to the internet. The problem came when I decided to try changing from assigning an IP address automatically via DHCP to a static IP by changing this file /etc/network/interfaces. Realizing I could not connect to the internet after reboot, I tried "fixing" this plus other "fixes" I can't remember and now the file looks like this:

source /etc/network/interfaces.d/* auto lo iface lo inet loopback auto enp0s31f6 allow-hotplug enp0s31f6 iface enp0s31f6 inet dhcp auto wlp2s0 allow-hotplug wlp2s0 iface wlp2s0 inet dhcp **EDIT** address 10.0.0.163 netmask 255.255.255.0 gateway 10.0.0.1

Here is the output of ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 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: enp0s31f6: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether 14:b3:1f:17:c8:36 brd ff:ff:ff:ff:ff:ff 3: wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether f8:59:71:a6:57:4d brd ff:ff:ff:ff:ff:ff

and finally this is what I get from sudo systemctl status networking.service

networking.service - Raise network interfaces Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled) Active: active (exited) since Tue 2017-09-26 12:23:50 EAT; 34s ago Docs: man:interfaces(5) Process: 5293 ExecStop=/sbin/ifdown -a --read-environment --exclude=lo (code=exited, status=0/SUCCESS) Process: 5419 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=0/SUCCESS) Process: 5413 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, status=0/SUCCESS) Main PID: 5419 (code=exited, status=0/SUCCESS) Tasks: 2 (limit: 4915) CGroup: /system.slice/networking.service ├─5473 /sbin/dhclient -4 -v -pf /run/dhclient.enp0s31f6.pid -lf /var/lib/dhcp/dhclient.enp0s31f6.leases -I -df /var/lib/dhcp/dhclient6.enp0s31f6.leases enp0s31f6 └─5581 /sbin/dhclient -4 -v -pf /run/dhclient.wlp2s0.pid -lf /var/lib/dhcp/dhclient.wlp2s0.leases -I -df /var/lib/dhcp/dhclient6.wlp2s0.leases wlp2s0
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  • Remove/save the files under /etc/network/interfaces.d/ and keep using only /etc/network/interfaces then configure a static ip Commented Sep 26, 2017 at 10:25
  • @GAD3R thank you for your response, i currently dont have any files in /etc/network/interfaces.d/ , i've added the address netmask and gateway to the file /etc/network/interfaces, but i still cant discover any networks Commented Sep 26, 2017 at 10:38
  • can you add the content of /etc/network/interfaces with a static IP Commented Sep 26, 2017 at 11:42
  • sure edited the question please check. Commented Sep 26, 2017 at 12:15
  • 1
    I dont think i have eth0 i think its enp0s31f6 from ifconfig command , my gateway is fine and ip as well. Commented Sep 26, 2017 at 12:31

2 Answers 2

Reset to default
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Edit your /etc/network/interfaces as follows:

auto lo iface lo inet loopback

Configure a static IP for your ethernet interface:dhcpcd method

Install dhcpcd:

sudo apt install dhcpcd5

Edit your /etc/dhcpcd.conf file :

sudo nano /etc/dhcpcd.conf

Past the following lines:

# define static profile profile static_enp0s31f6 static ip_address=10.0.0.163 /24 static routers=10.0.0.1 static domain_name_servers=10.0.0.1 # fallback to static profile on enp0s31f6 interface enp0s31f6 fallback static_enp0s31f6

Then disable the dhcpcd daemon:

sudo update-rc.d -f dhcpcd remove

enable networking:

sudo systemctl enable networking

Reboot then run: 

 sudo iptables -t nat -A POSTROUTING -o enp0s31f6 -j MASQUERADE sudo dhcpcd

Archlinux wiki dhcpcd

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 - write under:: auto wlp2s0 allow-hotplug wlp2s0 iface wlp2s0 inet dhcp address 10.0.0.163 netmask 255.255.255.0 broadcast 10.0.0.255 gateway 10.0.0.1 ################################################ wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf# or your wpa conf file path #or wpa-ssid "home-network-ssid" wpa-psk "secret-key" ################################################

and you can look

  • $ man interfaces
  • $ man ifcfg
  • $ man ifconfig
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