Problem with name resolution and static IP address

[Wojciech_Marusiak]

Hello Colleagues,

I want to configure static IP address from DHCP I am using right now.

Here is config of my /etc/network/interfaces

 auto lo
 iface lo inet loopback
 auto eth0
 iface eth0 inet static
 address 192.168.200.107
 netmask 255.255.255.0
 gateway 192.168.200.254
 dns-nameserver 192.168.200.254

And here is my /etc/NetworkManager/NetworkManager.conf

[main]
plugins=ifupdown,keyfile,ofono
#dns=dnsmasq
[ifupdown]
managed=true

When I implemented those changes I don't have working name resolution / dns.

My resolv.conf is empty.

What am I doing wrong here?

[papibe]

Hi Wojciech_Marusiak.

First, fix the interfaces file. It is dns-nameservers, with an s at the end:

...
 dns-nameservers 192.168.200.254
...

Then make sure your resolv.conf is a symlink to the proper file:

$ ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 29 Mar 26  2015 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

If it is not, remove it and create the symlink:

sudo rm /etc/resolv.conf

sudo ln -s ../run/resolvconf/resolv.conf /etc/resolv.conf

Restar your machine, and let us know how that went.

Regards.

[Wojciech_Marusiak]

Hi papibe,

I corrected typo. After reboot name resolution is still not working.

I have correct link to file:

root@ZBOX:~# ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 29 lip 15  2014 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

[papibe]

Is the machine not able to resolve google.com, and such?

or

other machines are not able to resolve that machine's name?

Could you open a terminal, run these commands and post back the results? (you can copy/paste the output):

cat /etc/resolv.conf 

ifconfig

nm-tool

nslookup google.com

dig ubuntuforums.org

route -n

ping 192.168.200.254

ping 199.19.56.1

Please note that if network-manager is installed, it overrides what you do on /etc/network/interfaces. You can easily set up the same static data in network-manager by using the GUI tool 'Network Connections'.

Regards.

[Bucky Ball]

If you tweak with the /interfaces file it will screw with Network Manager if you are using. Generally, you don't need to do any of what you are doing to create a static IP. I've never done it and statics are all I use.

Click Network Manager> Edit> Choose the connection and 'Edit'> IPv4 tab> change 'Automatic' to 'Manual' and put in the details for your static IP, gateway, DNS IPs, etc.

If your router is serving IPs DHCP, you need to set it to serve them in a certain range only, say 192.168.0.100-110. You would then set the static outside of that, say 192.168.0.111 and above (or below .99 and below).

Your /interfaces file should look like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

If you're using Network Manager for your connection, the moment you start changing the /interfaces file, expect trouble. They don't play together.

[Hadaka]

Hi, if you choose to use NetworkManager to manage your network then please do..
to help avoid typo's please copy and paste.
To save your current /etc/network/interfaces file

sudo cp /etc/network/interfaces /etc/network/interfaces.old

Or to delete it..

sudo rm /etc/network/interfaces

Then to build it for NetworkManager use..

echo "auto lo\niface lo inet loopback" | sudo tee /etc/network/interfaces

Next to configure your network IPv4 and IPv6 settings click the 'Network icon' then 'Edit Connections' and configure like the attached.
Screenshot from 2016-03-03 21:40:36.pngScreenshot from 2016-03-03 21:41:24.png
Finally change /etc/NetworkManager/NetworkManager.conf from true to false

sudo sed -i 's/true/false/' /etc/NetworkManager/NetworkManager.conf

reboot and test wireless

[Wojciech_Marusiak]

In reply to papibe

Hi,

root@ZBOX:~# cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

ifconfig

root@ZBOX:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:01:2e:56:2f:56
          inet addr:192.168.200.107  Bcast:192.168.200.255  Mask:255.255.255.0
          inet6 addr: fe80::201:2eff:fe56:2f56/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1354 errors:0 dropped:0 overruns:0 frame:0
          TX packets:347 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:108175 (108.1 KB)  TX bytes:55220 (55.2 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2412 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2412 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:216313 (216.3 KB)  TX bytes:216313 (216.3 KB)

nm-tool

root@ZBOX:~# nm-tool
No command 'nm-tool' found, did you mean:
 Command 'dm-tool' from package 'lightdm' (main)
nm-tool: command not found

nslookup google.com

root@ZBOX:~# nslookup google.com
;; connection timed out; no servers could be reached

dig ubuntuforums.org

root@ZBOX:~# dig ubuntuforums.org
; <<>> DiG 9.9.5-11ubuntu1.2-Ubuntu <<>> ubuntuforums.org
;; global options: +cmd
;; connection timed out; no servers could be reached

route -n

root@ZBOX:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.200.254 0.0.0.0         UG    100    0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
192.168.200.0   0.0.0.0         255.255.255.0   U     0      0        0 eth0

ping 192.168.200.254

root@ZBOX:~# ping 192.168.200.254
PING 192.168.200.254 (192.168.200.254) 56(84) bytes of data.
64 bytes from 192.168.200.254: icmp_seq=1 ttl=64 time=0.288 ms
64 bytes from 192.168.200.254: icmp_seq=2 ttl=64 time=0.241 ms
^C
--- 192.168.200.254 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.241/0.264/0.288/0.028 ms

ping 199.19.56.1

root@ZBOX:~# ping 199.19.56.1
PING 199.19.56.1 (199.19.56.1) 56(84) bytes of data.
64 bytes from 199.19.56.1: icmp_seq=1 ttl=53 time=118 ms
64 bytes from 199.19.56.1: icmp_seq=2 ttl=53 time=117 ms
64 bytes from 199.19.56.1: icmp_seq=3 ttl=53 time=151 ms
^C
--- 199.19.56.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 117.121/129.214/151.938/16.084 ms

In reply to Bucky Ball

I am not using Network Manager and I don't want to use it.

About DHCP range you are not entirely true. I can have static on my box from DHCP range. If DHCP client will receive lease from same IP as my box then both boxes will have problems. So far it is not the case.

In reply to Hadaka

I don't want to use Network Manager.

[Bucky Ball]

About DHCP range you are not entirely true. I can have static on my box from DHCP range. If DHCP client will receive lease from same IP as my box then both boxes will have problems. So far it is not the case.

Good idea to guarantee it never is, but leave it with you.

Good luck.

[papibe]

Thanks.

It looks like the problem is that the name server is not getting written on 'resolv.conf'. Lately, that job is now done by the resolvconf package.

Try reconfiguring the package, and then force it to update the resolv.conf:

sudo dpkg-reconfigure resolvconf

sudo resolvconf -u

Hope it helps. Let us know how it goes.
Regards.

[Wojciech_Marusiak]

Thanks.

It looks like the problem is that the name server is not getting written on 'resolv.conf'. Lately, that job is now done by the resolvconf package.

Try reconfiguring the package, and then force it to update the resolv.conf:

sudo dpkg-reconfigure resolvconf

sudo resolvconf -u

Hope it helps. Let us know how it goes.
Regards.

Hi papibe,

I tried your solution and it didn't work