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From: TBerk on 10 Jan 2010 19:07
Most TCP/IP configurations have two places for DNS enties, most of the
time they are the default provided by a given ISP.

Following up to the OpenDNS and/or GoogleDNS talks I was wondering if
there would be anything to gain from keeping one of those entries an
ISP one and the other an OpenDNS (or other) DNS entry?

berk
From: Jeff Liebermann on 10 Jan 2010 23:18
On Sun, 10 Jan 2010 16:07:42 -0800 (PST), TBerk
<bayareaberk(a)yahoo.com> wrote:

>Most TCP/IP configurations have two places for DNS enties, most of the
>time they are the default provided by a given ISP.
>
>Following up to the OpenDNS and/or GoogleDNS talks I was wondering if
>there would be anything to gain from keeping one of those entries an
>ISP one and the other an OpenDNS (or other) DNS entry?

Oh yes. If one goes down, or gets slow due to overuse, the other will
take over. The two DNS servers are also in different geographic
locations on the assumption that both routes are unlikely to disappear
at the same time.

Note that neither OpenDNS or GoogleDNS have a single central DNS
server. They use Anycast:
<http://en.wikipedia.org/wiki/Anycast>
to query the nearest available server and also do some load balancing.
Same with the NSI root DNS servers, AT&T DSL, Comcast DNS, etc.

In general, you should use the closest and fastest DNS servers:
<http://www.grc.com/dns/benchmark.htm>
<http://code.google.com/p/namebench/>


--
Jeff Liebermann jeffl(a)cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
From: isw on 11 Jan 2010 00:45
In article
<18c88f9c-2b27-42eb-8b95-b43cbcea8aaa(a)m3g2000yqf.googlegroups.com>,
TBerk <bayareaberk(a)yahoo.com> wrote:

> Most TCP/IP configurations have two places for DNS enties, most of the
> time they are the default provided by a given ISP.

Only two?

OS X allows for a list of DNS; pretty much as many as you care to give
it. I expect that would be true of other UNIX variants, also.

The reason to have several is to have a fallback if one is
unreachable/fails/is overloaded.

When I used Comcast I learned to keep a list, because they never managed
to figure out how to make their DNS work very reliably.

Isaac
From: TBerk on 11 Jan 2010 02:35
On Jan 10, 9:45 pm, isw <i...(a)witzend.com> wrote:
> In article
> <18c88f9c-2b27-42eb-8b95-b43cbcea8...(a)m3g2000yqf.googlegroups.com>,
>
>  TBerk <bayareab...(a)yahoo.com> wrote:
> > Most TCP/IP configurations have two places for DNS enties, most of the
> > time they are the default provided by a given ISP.
>
> Only two?
>
> OS X allows for a list of DNS; pretty much as many as you care to give
> it. I expect that would be true of other UNIX variants, also.
>
> The reason to have several is to have a fallback if one is
> unreachable/fails/is overloaded.
>
> When I used Comcast I learned to keep a list, because they never managed
> to figure out how to make their DNS work very reliably.
>
> Isaac

Sorry, all day long yesterday it was WinXP all over the place;
(Motorola DSL modem self-immolation, Dell laptop w/ self-immolating
NVidia video card, clone PC w/ 'non-standard' licensing and, wait for
it viri & trojans galore [ya think? Hmmm. Limewire, why am I not
surprised?], and so on)

Disregarding my mini-rant, 'ipconfig /all' shows two DNS entries,
hence my default like behavior.

Thx both I. & J. for real life feedback.


berk

From: Jeff Liebermann on 11 Jan 2010 02:41
On Sun, 10 Jan 2010 21:45:54 -0800, isw <isw(a)witzend.com> wrote:

>When I used Comcast I learned to keep a list, because they never managed
>to figure out how to make their DNS work very reliably.
>Isaac

Worse. Comcast has a DNS redirector setup so that failed queries
deliver an useless list or possible typos. It's really a pain.
Fortunately, there's an easy way out, which is to not use the "domain
helper service" servers, and use the local DNS servers that do not
have this feature:
<http://networkmanagement.comcast.net/DomainHelperLogic.htm>
<http://dns.comcast.net/dns-ip-addresses2.php>


--
Jeff Liebermann jeffl(a)cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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