Dtyjlui

OS: Ubuntu 16.04 LTS (GNU/Linux 4.4.0-1009-raspi2 armv7l)

So when i connect to my machine through ssh from windows with putty, i am able to do it with the IP 192.168.0.60.

Now when im listing my devices from the router admin web, it shows that its using the IP 192.168.0.109.

This is the output for the ifconfig cmd.

eth0      Link encap:Ethernet  HWaddr b8:27:eb:86:e1:e0

      inet addr:192.168.0.109  Bcast:192.168.0.255  Mask:255.255.255.0

      inet6 addr: fe80::ba27:ebff:fe86:e1e0/64 Scope:Link

      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

      RX packets:2233 errors:0 dropped:0 overruns:0 frame:0

      TX packets:1067 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1000

      RX bytes:163132 (163.1 KB)  TX bytes:167801 (167.8 KB)

And this is what i have in etc/network/interfaces

auto eth0

iface eth0 inet static

address 192.168.0.60

netmask 255.255.255.0

gateway 192.168.0.1

dns-nameserver 8.8.8.8

dns-nameserver 8.8.4.4

Another fact to think about is that when i restart the networking service, it throws the following error:

    Job for networking.service failed because the control process exited with

 error code. See "systemctl status networking.service" and "journalctl -xe" for details.

This is the systemctl status networking.service output:

networking.service - Raise network interfaces

   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)

  Drop-In: /run/systemd/generator/networking.service.d

           └─50-insserv.conf-$network.conf

   Active: failed (Result: exit-code) since Thu 2017-03-23 15:31:59 UTC; 2min 1s ago

     Docs: man:interfaces(5)

  Process: 2046 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)

  Process: 2038 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list

 Main PID: 2046 (code=exited, status=1/FAILURE)



Mar 23 15:31:58 ubuntu dhclient[2065]: DHCPREQUEST of 192.168.0.109 on eth0 to 255.255.255.255 port 67 (xid=0x6fc3c068)

Mar 23 15:31:58 ubuntu dhclient[2065]: DHCPACK of 192.168.0.109 from 192.168.0.1

Mar 23 15:31:58 ubuntu ifup[2046]: RTNETLINK answers: File exists

Mar 23 15:31:59 ubuntu ifup[2046]: bound to 192.168.0.109 -- renewal in 657200529 seconds.

Mar 23 15:31:59 ubuntu ifup[2046]: RTNETLINK answers: File exists

Mar 23 15:31:59 ubuntu ifup[2046]: Failed to bring up eth0.

Mar 23 15:31:59 ubuntu systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE

Mar 23 15:31:59 ubuntu systemd[1]: Failed to start Raise network interfaces.

Mar 23 15:31:59 ubuntu systemd[1]: networking.service: Unit entered failed state.

Mar 23 15:31:59 ubuntu systemd[1]: networking.service: Failed with result 'exit-code'.

Notice the following line:

Mar 23 15:31:59 ubuntu systemd[1]: Failed to start Raise network interfaces.

Can somebody tell me what is going on and how i could fix that?

Edit: Results of route -n:

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 eth0

192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

I have found that if you're making use of the /etc/network/interfaces file within Ubuntu that it's best to disable Ubuntu's NetworkManager. My colleagues and I have experience weird issues when you've set static IPs and such in the config file but then NetworkManager likes to do its own thing.

Check out the Stopping and Disabling NetworkManager on the Ubuntu help site.

Though since you can access the Static IP even though your interface is receiving a dynamic one, it would be interesting to see what your routing table is like: route -n

Potentially you had a static IP address defined but also had DHCP running.

Instead of using ifconfig, see if there are multiple ip addresses configured on the interface via

ip addr show eth0

See if there is a dhcp service running

ps -ef | grep dhcp

You can disable the dhcp service via

sudo systemctl disable dhcpcd

Then i would say restart the device and see if the secondary IP address has disappeared.
This could have happened because your DNS (/etc/resolv.conf) is setup correctly and points to your DHCP server to grab an IP