Public bug reported:

Heaps of people all over the net are having issues with certain models
of router sending back 1.0.0.0 for any DNS request. (Not only on Ubuntu)

Usual answers include (that actually work)
- Set DNS in the router manually
- Set DNS in the computer manually (and lock/stop changing of resolv.conf)

also

- Disabling ipv6. (not proven to work)

These solutions are not actually solutions at all, they are workarounds,
I'm unable to find a fix for it that does not involve setting manual DNS
in the PC or router, but without this I can't use Ubuntu for my clients
!!!

In my situation I have a standard build that needs to go worldwide with
no editing or setting of manual DNS in the PC. (This also means that I
can't access a clients ADSL modem to put the DNS settings in there).

Windows machines work fine.

It may be something about the router purporting to be a DNS Server when
actually it's a DNS Forwarder?

On some of the routers, installing later firmware fixes it. (But not
always). Using Windows always fixes it!

Why can't we do whatever windows does and have it "just work".

Do a google search for Ubuntu 1.0.0.0 and you'll see how many times this
issue is happening !

(One forum suggested it could it be an MTU too high / iptables issue?)

This bug may be what people are meaning in Launchpad Bug #'s 24818 and
23183

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
DNS Resolves everything to 1.0.0.0 intermittently on some ADSL Routers
https://launchpad.net/bugs/81057

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