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Thanks to both of you for your replies, +trace did show me the name servers for the domain and which answered, I would still need to query the other name servers but that's OK. I wasn't aware that the standard DNS reply would show all A records for a domain
- that's good to know, I wish I had a DNS round robin configuration to test against (we don't use it internally). Fortunately I don't have to worry about different IP addresses based on location and my "context" doesn't involve CDNs so I can avoid that issue.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> bind-users <bind-users-bounces@lists.isc.org> on behalf of Matus UHLAR - fantomas <uhlar@fantomas.sk><br>
<b>Sent:</b> Wednesday, January 29, 2020 1:34 PM<br>
<b>To:</b> bind-users@lists.isc.org <bind-users@lists.isc.org><br>
<b>Subject:</b> [EXTERNAL] Re: Getting all IP adresses for a domain name</font>
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<div class="PlainText">On 29.01.20 19:12, Leroy Tennison wrote:<br>
>I ran into a situation here the IP (v4) address returned for a domain was<br>
> different from two systems. It turned out that two DNS servers served the<br>
> domain and were replying with different IP addresses (discovered by doing<br>
> whois on the domain followed by dig @<name server> for each name server). <br>
> This led me to wonder "How would I get all IP addresses if DNS round robin<br>
> was being used?" I work with external organizations so I can't count on<br>
> the DNS server being ISC's. I'm not concerned about multiple servers<br>
> behind a single IP address (Anycast for instance) because I consider<br>
> issues related to that to be the destination organization's problem, I'm<br>
> only concerned with what possible IP addresses could be returned in<br>
> response to a query.<br>
<br>
in standard operation, DNS returns all A records associated with a domain<br>
name.<br>
<br>
However, current CDNs tend to send different IPs for different clients,<br>
often just the one that is tropologically closest to the client.<br>
<br>
Unfortunately, such CDNs don't provide all possible addresses so I guess you<br>
are unlucky here.<br>
<br>
-- <br>
Matus UHLAR - fantomas, uhlar@fantomas.sk ; <a href="https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.fantomas.sk%2f&c=E,1,ZWC6GZyMtjHtMy2-T3ri182cQqZHtLQGM2tlkQO-yTfTAmsYFEZHtFhRjArPKCOQSHvN_Mb7MeN2gJ71jYKgYa0L82YX2MaJ3ebpnuB6YYPojoqxmlLoUWgL&typo=1">
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Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.<br>
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