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Edit connection Mobile Broadband : select network name : Edit IP4 settings: Under Methods : Automatic PPP and Automatic PPP address only

Changed DNS Server to: 198.153.192.40 and Search Domains To: 198.153.194.40 Yet the output of $ cat /etc/resolv.conf: Is

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
nameserver 127.0.0.1
search 198.153.194.40

It is the same output on wireless network also.

Is this normal for nameserver?

Out put of Cat /etc/issue :

Distributor ID: Ubuntu
Description:    Ubuntu 12.04.3 LTS
Release:    12.04
Codename:   precise
Ubuntu 12.04.3 LTS \n \l

Am having many intrusions to my PC and wonder if that is a contribute factor.

Although, DNS test like (www.dnsleaktest.com) does show what was implemented at "Edit Connections" That is the IP address' of the public DNS added.

Ubuntu Network Tools (3.2.0) shows:

Devices: Network Devices: Loopback interface (lo) Protocol: IPv6 IP address: ::1 Netmask: 128 Scope: Host Protocol: IPv4 IP address: 127.0.0.1 Netmask: 255.0.0.0 Scope:

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1 Answer 1

Yes, that is normal. On Ubuntu Desktop since 12.04 there is a dnsmasq instance listening on the the loopback interface at address 127.0.0.1 (127.0.1.1 in 12.10 and later) that functions as a forwarder for DNS queries.

However, it is not normal to set search to an IP address. You may delete the Search Domain entry; it is not necessary on consumer desktop installations.

You can test the local nameserver with something like

dig google.com @127.0.0.1

Dnsmasq receives upstream nameserver addresses via NetworkManager->DBUS->dnsmasq.

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This question and many others: (askubuntu.com/questions/2321/…) show that user can change/reset DNS in use rather than the loop-back server. Although it is understood that wireless local network is different from a broadband that also a wireless WAN configured independently from Network Manger IP4 DNS sittings. –  user176105 Sep 3 '13 at 21:32
    
I do not understand your comment. Could you rephrase? Do you experience a malfunction? I understood the OP as of pure interest, not as a request for help on any issue. –  JoBo Sep 4 '13 at 14:22
    
Yes, I do get frozen browsers , invalid signatures while updating from respiratory, and some intrusions from time to time. So am trying to make sure that Internet configuration is the correct one. Thanks. –  user176105 Sep 5 '13 at 9:55

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