Don't quite grasp SOA, reading Master Windows 2000, Mark Minasi

J

Jacques Koorts

This guy says:

"Every domain has a SOA. It is the record that names the primary DNS server
for the domain."

Now if this is true then I have a big problem. I created two DC's under the
same domain. Here their SOA records:

[52],backup.cca-whouse.ccalimited.com.,jkoorts.ccalimited.com.
[53],file-warehouse.cca-whouse.ccalimited.com.,jkoorts.ccalimited.com.

So what I have contradicts what mark is saying as I have more than one SOA,
and thus more than one Primary DNS server. Note I'm using AD integrated.

Can someone clarify this for me please?

thanks
jacques
 
J

Jacques Koorts

I've now went over to the backup.cca-whouse.ccalimited.com. machine, and
changed that SOA entry to file-warehouse.cca-whouse.ccalimited.com.

I clicked refresh and the backup.cca-whouse.ccalimited.com. entry appeared
again as the SOA with an increment in the serial.

Now im totally confused.
 
W

William Stacey [MVP]

Both are primaries, so it is ok. They are multi-masters for the zone and
keep each other in sync for ad-integrated zones. The rfcs don't yet talk
about multi-master replication, but I assume an rfc will be added some day.
This is more an implementation feature, so more then an rfc item, so maybe
not.
 
K

Kevin D. Goodknecht [MVP]

In
Jacques Koorts said:
This guy says:

"Every domain has a SOA. It is the record that names the primary DNS
server for the domain."

Now if this is true then I have a big problem. I created two DC's
under the same domain. Here their SOA records:

[52],backup.cca-whouse.ccalimited.com.,jkoorts.ccalimited.com.
[53],file-warehouse.cca-whouse.ccalimited.com.,jkoorts.ccalimited.com.

So what I have contradicts what mark is saying as I have more than
one SOA, and thus more than one Primary DNS server. Note I'm using AD
integrated.

Can someone clarify this for me please?

When using Active Directory Integrated DNS zones the DC it is on will make
it self the SOA Primary name server.
This is not a problem and is as expected, each ADI zone is a master writable
copy that is replicated through AD.
 
J

Jonathan de Boyne Pollard

JK> MM> Every domain has a SOA. It is the record that names the
JK> MM> primary DNS server for the domain.
JK>
JK> Now if this is true then I have a big problem.

Then it is fortunate for you that it's not true. The first sentence is not
true because it is erroneously conflating "zone" and "domain". The second
sentence is not true because it is erroneously assuming, by assuming that
there is even such a thing as "the primary DNS server", only one particular
mechanism for database replication amongst peer content DNS servers, when
in fact there are many.

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/dns-database-replication.html>
 

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