Manually configured DNS servers are not used

MrMister2015 · 4. Oktober 2015

I've manually configured 3 DNS servers in the web GUI. I set a static IP. However, if I check with nslookup, the DNS server is wrong (my default router DNS, configured for OpenDNS). I've read some similar posts about deleting the eth0 entry, but that did not work. Any tips?

Ralph

Code

cat /etc/network/interfaces


# The loopback network interface
auto lo
iface lo inet loopback
iface lo inet6 loopback


# eth0 network interface
auto eth0
allow-hotplug eth0
iface eth0 inet static
    address 192.168.1.7
    gateway 192.168.1.1
    netmask 255.255.255.0
    dns-nameservers 37.235.1.174 84.200.69.80 91.239.100.100
iface eth0 inet6 manual
    pre-down ip -6 addr flush dev $IFACE

Alles anzeigen

Code

root@NAS:~# nslookup [url]www.ibm.com[/url]
Server:        208.67.222.222
Address:    208.67.222.222#53


Non-authoritative answer:
[url]www.ibm.com[/url]    canonical name = [url]www.ibm.com.cs186.net[/url].
[url]www.ibm.com.cs186.net[/url]    canonical name = [url]www.ibm.com.edgekey.net[/url].
[url]www.ibm.com.edgekey.net[/url]    canonical name = [url]www.ibm.com.edgekey.net.globalredir.akadns.net[/url].
[url]www.ibm.com.edgekey.net.globalredir.akadns.net[/url]    canonical name = e2874.x.akamaiedge.net.
Name:    e2874.x.akamaiedge.net
Address: 2.17.43.195

Alles anzeigen

tekkb · 5. Oktober 2015

Why are you doing this manually?
It can be done easily from the Sytem/Network/Interfaces
Then click on the interface you want and click edit.
In the pop up scroll down to DNS servers and Search Domains.
The DNS server should be ip of your router.
The Search domains will be all the external DNS server ips you want to use. (we recommend normally google's 8.8.8.8)

The entry in the interface file for the search domains will show as:
dns-search 8.8.8.8

Make your edits via the web gui for this and then test. Then if there is issue we try to sort it out or file bug report.

MrMister2015 · 5. Oktober 2015

With "manually configured ... in the web GUI" I meant I changed it by hand from Sytem/Network/Interfaces. So no DHCP.

I am not sure I understand your suggestions about DNS setting en Search Domains. From Sytem/Network/Interfaces, I changed:
- IPv4 to Static
- Address to 192.168.1.7 (local address outside DHCP range) with netmask 255.255.255.0
- Gateway 192.168.1.1 (IP of router)
- DNS servers to my preferred external DNS servers.
- No additional search domains

OMV creates a correct /etc/network/interfaces, see above.

Your suggestion about using my router IP as DNS server is counter-intuitive. Router IP is normally the gateway.

But, I will test and report back...

Ralph

tekkb · 5. Oktober 2015

I guess it is counter intuitive if you do not want to resolve names to ips on your LAN. I don't think external DNS servers are going to accomplish this for you.

MrMister2015 · 5. Oktober 2015

I've changed as per your suggestions. No change.

Code

root@NAS:~# cat /etc/network/interfaces 
# The loopback network interface
auto lo
iface lo inet loopback
iface lo inet6 loopback


# eth0 network interface
auto eth0
allow-hotplug eth0
iface eth0 inet static
    address 192.168.1.7
    gateway 192.168.1.1
    netmask 255.255.255.0
    dns-nameservers 192.168.1.1
    dns-search 37.235.1.174 84.200.69.80 91.239.100.100
iface eth0 inet6 manual
    pre-down ip -6 addr flush dev $IFACE

Alles anzeigen

Code

root@NAS:~# nslookup www.ibm.com
Server:        208.67.222.222
Address:    208.67.222.222#53


Non-authoritative answer:
www.ibm.com    canonical name = www.ibm.com.cs186.net.
www.ibm.com.cs186.net    canonical name = www.ibm.com.edgekey.net.
www.ibm.com.edgekey.net    canonical name = www.ibm.com.edgekey.net.globalredir.akadns.net.
www.ibm.com.edgekey.net.globalredir.akadns.net    canonical name = e2874.x.akamaiedge.net.
Name:    e2874.x.akamaiedge.net
Address: 2.17.43.195

Alles anzeigen

MrMister2015 · 5. Oktober 2015

I've found the solution. Problem is that there is no /etc/resolv.conf. This is accomplished by executing

Code

dpkg-reconfigure --frontend=noninteractive resolvconf

as indicated in [RESOLVE] DNS out

I think this configuration should be part of the OVM installation script. My initial configuration was fine.

Ralph

subzero79 · 5. Oktober 2015

It is, it runs under omv-initsystem, you usually run it after you install on top of Debian, I assume is in the ISO also.

MrMister2015 · 6. Oktober 2015

I did a stock ISO install, so probably there's a difference with the on top of Debian install.

Jetzt mitmachen!