DNS Resolution Anomaly - Asus N66 & Linux Lite 2.0(Ubuntu 14.04)

[wirezfree]

Hi,

Bit of a strange one, or I'm being stupid..!!, Linux Lite 2(LL2) on Laptop
Wired connection direct to router.

Have installed a new Wireless Router(Asus N66) connected to my
Broadband Modem.
The install set-up all seemed fine, Router connected to my ISP and
I can see the WAN & DNS addresses O.K in the log.
However, when I opened my Browser, "Page Cannot Be Displayed"
I opened a terminal and do some pings:

BBC By IP:

dave@hp-laptop:~$ ping 212.58.244.119
PING 212.58.244.119 (212.58.244.119) 56(84) bytes of data.
64 bytes from 212.58.244.119: icmp_seq=1 ttl=53 time=21.9 ms
64 bytes from 212.58.244.119: icmp_seq=2 ttl=53 time=21.2 ms
64 bytes from 212.58.244.119: icmp_seq=3 ttl=53 time=21.5 ms
^C
--- 212.58.244.119 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 21.264/21.586/21.944/0.278 ms

BBC News By url:

dave@hp-laptop:~$ ping news.bbc.co.uk
ping: unknown host news.bbc.co.uk
dave@hp-laptop:~$

So...
I think DNS, recheck router all seems fine, to further test fire up
my daughters Windows laptop, connect to router browsing fine

Then..
I add a DNS Server manually to the connection in LL2 in the connection manager settings,
re-start it, and ping again

BBC News By url:

dave@hp-laptop:~$ ping news.bbc.co.uk
PING newswww.bbc.net.uk (212.58.244.61) 56(84) bytes of data.
64 bytes from bbc-vip106.telhc.bbc.co.uk (212.58.244.61): icmp_seq=1 ttl=53 time=21.4 ms
64 bytes from bbc-vip106.telhc.bbc.co.uk (212.58.244.61): icmp_seq=2 ttl=53 time=21.0 ms
64 bytes from bbc-vip106.telhc.bbc.co.uk (212.58.244.61): icmp_seq=3 ttl=53 time=21.5 ms
64 bytes from bbc-vip106.telhc.bbc.co.uk (212.58.244.61): icmp_seq=4 ttl=53 time=21.5 ms
64 bytes from bbc-vip106.telhc.bbc.co.uk (212.58.244.61): icmp_seq=5 ttl=53 time=21.7 ms
^C
--- newswww.bbc.net.uk ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4006ms
rtt min/avg/max/mdev = 21.058/21.468/21.731/0.275 ms
dave@hp-laptop:~$

So that works, and also web browsing is now working.
So I'm now a bit confused.?? Windows O.K,
But LL2 I need to have a DNS entry added.

The only thing I can think of.?
My new router's LAN is in a different IP range compared to previous...
So as LL2/Network Manager got the old router settings cached.?,
and adding the DNS manually is overriding that.?

Any suggestions/ideas welcome. (I'm really new to this stuff)
Thanks... Dave