Name Servers and the Net?

I understand the function of the nameserver for DNS. What I am
attempting to understand is how the internet handles someone assigning
ns1.abc.com and ns2.abc.com to two different ip ranges. Eg. duplicate
nameserver entries on two machines.

Is there some net measure to prevent this from occurring? Does the
net only accept the first defined?

Mostly curious as I can not find any real information on this topic.
Also want to know if I make this mistake while setting up a machine,
what will occur!

Thanks

David wrote:

> I understand the function of the nameserver for DNS. What I am
> attempting to understand is how the internet handles someone assigning
> ns1.abc.com and ns2.abc.com to two different ip ranges.

The person controlling the name server for abc.com sets the IP address of
ns1 to IP address xxx.yyy.zzz.nnn and the address to aaa.bbb.ccc.nnn The
net knows these IP address because you give the address to the service
where you rented your domain name:

http://www.internic.net/index.html
http://www.internic.net/alpha.html

> Eg. duplicate
> nameserver entries on two machines.

Um, I may be missunderstanding what you are saying, but backup nameservers
should be on different subnets having different IP addresses, and they
should have duplicate entries. in other words, duplicate nameserver entries
should be on two machines.

>
> Is there some net measure to prevent this from occurring? Does the
> net only accept the first defined?

Why would you want to stop what should be done?

>
> Mostly curious as I can not find any real information on this topic.
> Also want to know if I make this mistake while setting up a machine,
> what will occur!

It will behave the way it should.

>
> Thanks

--
Because I am tired of google trolls, I have started blocking all usenet
posts from Google. Have fun Ethan, Tina, Maureen, or whatever name you
chose to go by.

left_coast wrote:

> address to aaa.bbb.ccc.nnn

should read "the address for ns2 to aaa.bbb.ccc.nnn"
--
Because I am tired of google trolls, I have started blocking all usenet
posts from Google. Have fun Ethan, Tina, Maureen, or whatever name you
chose to go by.

On 2006-09-22, David <(E-Mail Removed)> wrote:
> I understand the function of the nameserver for DNS. What I am
> attempting to understand is how the internet handles someone assigning
> ns1.abc.com and ns2.abc.com to two different ip ranges. Eg. duplicate
> nameserver entries on two machines.

Those are not duplicate nameserver entries.

Strictly speaking, there are no duplicate nameserver entries: you
are allowed to give ns1.example.com (don't use real domains in
examples) two different A records; in that case your nameserver
will usually return one address in round-robin fashion (though
this can usually be customized in your nameserver).

It's not really a good idea to round-robin your nameservers;
if you have two, make two separate names and report both to
your upstream DNS.

Often registrars *require* that you have at least two nameservers,
and that they be on two different physical networks. So it would
make a lot of sense to have ns1 on 192.168.1.x and ns2 on 10.0.0.x
(supposing that those were valid IP ranges) if you ran those boxes
(or had someone running DNS for you on them).

One of the better references on BIND (a very popular nameserver)
is the ORA book _DNS and BIND_.

--keith

--
kkeller-(E-Mail Removed)
(try just my userid to email me)
AOLSFAQ=http://www.therockgarden.ca/aolsfaq.txt
see X- headers for PGP signature information

David wrote:

> I understand the function of the nameserver for DNS. What I am
> attempting to understand is how the internet handles someone assigning
> ns1.abc.com and ns2.abc.com to two different ip ranges. Eg. duplicate
> nameserver entries on two machines.

It is not clear what you are asking. What do you mean by "assigning" a
nameserver to an "ip range"?

What do you mean by "duplicate"? You are talking about two different
host names (ns1.abc.com and ns2.abc.com) with different IPs, I think.
So what's being duplicated?

It is also not clear what this has to do with Linux.

DS

Hello

David Schwartz a écrit :
>
> It is also not clear what this has to do with Linux.

For the reader that I am, it is also not clear whether the dot between
"linux" and "networking" in the name of the newsgroup is a logical AND
or a logical OR. For instance I read topics about Cisco devices or file
permissions which do not seem related to both Linux and networking, and
people here don't seem to mind about it.

On comp.os.linux.networking, in
<ef08sh$2eme$(E-Mail Removed)>, "Pascal Hambourg" wrote:

> Hello
>
> David Schwartz a crit:
>
>> It is also not clear what this has to do with Linux.
>
> For the reader that I am, it is also not clear whether the dot
> between "linux" and "networking" in the name of the newsgroup
> is a logical AND or a logical OR.

http://groups.google.com/advanced_group_search
Pascal Hambourg
Results 1 - 100 of about 1,040 posts in the last year
3 comp.os.linux.networking
3 comp.protocols.ppp
4 comp.protocols.tcp-ip
1 fr.bienvenue.questions
2 fr.comp.divers
1 fr.comp.mail
2 fr.comp.materiel.optimisation
14 fr.comp.os.linux.configuration
5 fr.comp.os.ms-windows
1 fr.comp.peripheriques.modems
8 fr.comp.reseaux.ethernet
13 fr.comp.reseaux.ip
1 fr.comp.reseaux.sans-fils
3 fr.comp.securite
1 fr.comp.securite.virus
1 fr.comp.stockage
5 fr.comp.sys.pc
1 fr.misc.droit
3 fr.misc.droit.internet
4 fr.reseaux.internet.fournisseurs
2 fr.reseaux.telecoms.adsl
1 fr.usenet.abus.d
1 fr.usenet.distribution
3 linux.debian.maint.firewall
17 linux.debian.user.french

You've posted over a thousand times in the last year and you
don't know that the "." is an AND operator in newsgroups names?

Did you wonder whether fr.comp.peripheriques.modems was
either about French or computers?

Or whether fr.comp.materiel.optimisation was about optimization
or materials?

Or about materials or computers?!

How did you ever figure out which group to post on?

> For instance I read topics
> about Cisco devices or file permissions which do not seem
> related to both Linux and networking, and people here don't
> seem to mind about it.

Yes. Off-topic posts and threads occur on groups. Doesn't in any
way logically lead to your implied question.

You always post here using Windows, but obviously know a great
deal about Linux and run Debian (I've read a lot of your other
posts).

I'll have to assume that this post is a joke.

You obviously aren't this stupid or ignorant.


Alan

--
http://home.earthlink.net/~alanconnor/contact.html
http://home.earthlink.net/~alanconnor/cr.html
http://home.earthlink.net/~alanconnor/publickey.html

Pascal Hambourg wrote:

> Hello

> David Schwartz a écrit :

> > It is also not clear what this has to do with Linux.

> For the reader that I am, it is also not clear whether the dot between
> "linux" and "networking" in the name of the newsgroup is a logical AND
> or a logical OR.

Honestly, would it make any sense at all to have a newsgroup that was
about networking in general and Linux in general?

It's increasing specificity. This group is broadly about computers,
more specifically about computers that run Linux, most specifically
about network involving computers that run Linux.

If you don't understand the basics about USENET and hierachies, you
should not be posting.

> For instance I read topics about Cisco devices or file
> permissions which do not seem related to both Linux and networking, and
> people here don't seem to mind about it.

Your post was even further off-topic than those. At least a post about
a Cisco device is about some device that networks. At file permissions
are a Linux feature.

You do have a fair point though, people have been slacking in pointing
out what is on and off-topic around here. You really do have to point
these things out every time, otherwise people can get an erroneous
sense of what is on or off-topic. IMO, that's no excuse for not making
the effort to learn what you're doing before posting, but a lot of the
blame goes to services like google that provide people with USENET
access without making any attempt to ensure they know what they're
doing there. It's kind of like stapling a couple of $50 bills to an
Aborigine and dropping him in the middle of New York City.

DS

<article not downloaded:

Info about "Alan Connor"

Alan "The Usenet Beavis" Connor is a good friend of Bigfoot:
http://tinyurl.com/23r3f

A couple of years ago he was kidnapped and raped by Xena,
the Warrior Princess: http://tinyurl.com/2gjcy

Beavis believes that the MSBlast virus of yesteryear was explicitly
targeting him, for some inexplicable reason: http://tinyurl.com/ifrt

Beavis belongs to a UFO cult: http://tinyurl.com/2hhdx
Beavis's life in a UFO cult: http://tinyurl.com/24jqm
Beavis knows all about network security: http://tinyurl.com/5qqb6
And he's also a search engine expert: http://tinyurl.com/9pjnt

Alan doesn't believe in anyone else's existence ...

Alan accuses practically everyone of being a troll/spammer.
Apparently, Alan is the only real person in the newsgroups in which he posts.

http://www.pearlgates.net/nanae/kooks/ac/fga.shtml
http://groups.google.com/groups/prof...-MEqh3HQ&hl=en
http://www.pearlgates.net/nanae/kooks/ac/
http://linuxmafia.com/faq/Mail/challenge-response.html
http://www.spamcop.net/fom-serve/cache/329.html#CR
http://www.gatago.com/authors_pgs/13650.html
http://blog.bananasplit.info/?p=84
http://tinyurl.com/ifrt
http://tinyurl.com/3h6a5
http://tinyurl.com/ys6z4
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