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--></style><title>Re: [dns-operations] Why the record locates in com.
zone?</title></head><body>
<div>I just did a query and see that zq681.com is on different NS now
- mns0[12].domaincontrol.com. Not looking much further myself,
I'd say that the domain name is "in motion." What I've
learned is that it is very hard to figure out what's happening by
looking at the output of dig and even whois. If you want to get
to the bottom of this, you might call the registrants and/or
registrars involved.</div>
<div><br></div>
<div>Beyond that, it is possible that COM would hold glue records for
ns1.wondns.com even if it is not an NS for zq681.com. The reason
is that it could be hosting another domain name. Without any out
of band knowledge, it is nearly impossible to discover this.
(You can get a zone transfer from Verisign and look.)</div>
<div><br></div>
<div>And finally, Mark is right, you probably should read up on
"glue" - not just in the RFCs but in some other texts on
DNS. Glue is a feature of DNS that is misunderstood my many
people, even those with moderate amounts of experience in the
protocol. It's "frustrating-ly simple."</div>
<div><br></div>
<div>At 16:07 +0800 9/13/11, ¡žñæêØÅFÅj wrote:</div>
<div>The com zone tell us that the NSes for zq681.com is
ns[3-4].wondns.com while the NSes for wondns.com is
ns[1-2].wondns.com. At the same time, the glue for ns[1-2].wondns.com
do be in the com zone. So I think it is not neccessary for the com
zone to have the glue for ns[3-4], though the existence of the glues
may be not wrong but be effective for lookup performance.</div>
<div>2011-09-13</div>
<hr>
<div>Mingxing, Liu</div>
<div>CNNIC</div>
<div><a
href="mailto:liumingxing@cnnic.cn">liumingxing@cnnic.cn</a></div>
<hr size="1">
<div>…¢åèêlÅF Mark Andrews</div>
<div>…¢ëó ±º”ÅF 2011-09-12 22:21:23</div>
<div>ùæåèêlÅF ¡žñæêØÅFÅj</div>
<div>è¥ëóÅF carlos; dns-operations</div>
<div>éÂÃ’ÅF Re: [dns-operations] Why the record locates in
com. zone?</div>
<div
>Please go read up about glue records.</div
>
<div>RFC 1034:</div>
<div
>One of the goals of the zone stru<span
></span
>cture is that any zone have all t<span
></span>he</div>
<div
>data required to set up communications <span
></span>with the name servers for any</div>
<div
>subzones. That is, parent zones have<span
></span> all the information needed to</div>
<div
>access servers for their children zones.<span
></span> The NS RRs that name the</div
>
<div
>servers for subzones are often not eno<span
></span
>ugh for this task since they name</div>
<div
>the servers, but do not give their <span
></span>addresses. In particular, if the</div
>
<div
>name of the name server is itself <span
></span
>in the subzone, we could be faced<span
></span> with</div>
<div
>the situation where the NS RRs tell<span
></span
> us that in order to learn a<span
></span> name</div>
<div
>server's address, we should contact the <span
></span>server using the address we wish</div
>
<div
>to learn. To fix this problem, a<span
></span
> zone contains "glue" RRs which<span
></span> are not</div>
<div
>part of the authoritative data, and ar<span
></span>e address RRs for the servers.</div>
<div
>These RRs are only necessary if the<span
></span
> name server's name is "below"<span
></span> the</div>
<div
>cut, and are only used as part of<span
></span> a referral response.</div>
<div>and also from RFC 1034</div>
<div
>As the last installation step, the del<span
></span>egation NS RRs and glue RRs</div>
<div
>necessary to make the delegation effective<span
></span> should be added to the parent</div
>
<div
>zone. The administrators of both zone<span
></span>s should insure that the NS and</div
>
<div
>glue RRs which mark both sides of <span
></span
>the cut are consistent and remain so.</div
>
<div
>So to answer your question, the addres<span
></span>s records need to be stored</div>
<div
>in *both* the com and wondns.com zones<span
></span> and they also need to be</div>
<div>kept in the same.</div>
<div>Mark</div>
<div
>In message <515833501.01129@cnnic.cn> <20110<span
></span>9122118183171998@cnnic.cn>, "=?gb23</div>
<div>12?B?wfXD99DHo7qjqQ==?=" writes:</div>
<div
>> sorry, I did<span
></span
> not give a explicit discription about<span
></span> my question. The</div>
<div
>> question is that in my opinion<span
></span
> the RR "ns3.wondns.com. 172800 <span
></span>IN A</div>
<div
>> 113.105.171.124" should not be in<span
></span
>cluded in the 'com.' zone but in <span
></span>the</div>
<div>> wondns.com zone.</div>
<div
>> The zq681.com <span
></span
>zone is authorized to the servers ns3.<span
></span>wondns.com zone</div>
<div
>> and ns4.wondns.com. Well, at the <span
></span>time, one question is coming ---where</div
>
<div
>> should be the addresses of the<span
></span
> two servers stored? Maybe in the<span
></span> com zone</div>
<div
>> or maybe in the wondns.com zone.<span
></span
> It is known that wondns.com zone<span
></span> is</div>
<div
>> Authorized out to the two servers<span
></span> --ns1.wondns.com and ns2.wondns.com, so</div
>
<div
>> the RR "ns3.wondns.com. 17<span
></span
>2800 IN A 113.105.171.124" should exis<span
></span>t in</div>
<div
>> the wondns.com zone instead of th<span
></span
>e com zone. However, I find that <span
></span>the RR</div>
<div
>> exists in the com zone. I wa<span
></span
>nt to know whether the RR should <span
></span>exist in the</div>
<div>> com zone.</div>
<div>></div>
<div>> 2011-09-12</div>
<div>></div>
<div>></div>
<div>></div>
<div>> Mingxing</div>
<div>--</div>
<div>Mark Andrews, ISC</div>
<div
>1 Seymour St., Dundas Valley, NSW 2117<span
></span>, Australia</div>
<div
>PHONE: +61 2 9871 4742 <span
></span
> <span
></span> INTERNET: marka@isc.org</div>
<div><br>
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