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. ________________________________ From: bind-users <bind-users-boun...@lists.isc.org> on behalf of Matus UHLAR - fantomas <uh...@fantomas.sk> Sent: Wednesday, January 29, 2020 1:34 PM To: bind-users@lists.isc.org <bind-users@lists.isc.org> Subject: [EXTERNAL] Re: Getting all IP adresses for a domain name
On 29.01.20 19:12, Leroy Tennison wrote: >I ran into a situation here the IP (v4) address returned for a domain was > different from two systems. It turned out that two DNS servers served the > domain and were replying with different IP addresses (discovered by doing > whois on the domain followed by dig @<name server> for each name server). > This led me to wonder "How would I get all IP addresses if DNS round robin > was being used?" I work with external organizations so I can't count on > the DNS server being ISC's. I'm not concerned about multiple servers > behind a single IP address (Anycast for instance) because I consider > issues related to that to be the destination organization's problem, I'm > only concerned with what possible IP addresses could be returned in > response to a query. in standard operation, DNS returns all A records associated with a domain name. However, current CDNs tend to send different IPs for different clients, often just the one that is tropologically closest to the client. Unfortunately, such CDNs don't provide all possible addresses so I guess you are unlucky here. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.fantomas.sk%2f&c=E,1,ZWC6GZyMtjHtMy2-T3ri182cQqZHtLQGM2tlkQO-yTfTAmsYFEZHtFhRjArPKCOQSHvN_Mb7MeN2gJ71jYKgYa0L82YX2MaJ3ebpnuB6YYPojoqxmlLoUWgL&typo=1 Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. BSE = Mad Cow Desease ... BSA = Mad Software Producents Desease _______________________________________________ Please visit https://linkprotect.cudasvc.com/url?a=https%3a%2f%2flists.isc.org%2fmailman%2flistinfo%2fbind-users&c=E,1,k6xXThc-6-hmh0VQPQMnHfZ9d_gFtjWFaiG4Lw0jQtFjXmLVFxWLxn0ll6vuy0tuDxwzy1NeUP92giorPz1zVf-yTE9f9m0Jr9Qulcf9jx-kmtUKj_tfYXs,&typo=1 to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://linkprotect.cudasvc.com/url?a=https%3a%2f%2flists.isc.org%2fmailman%2flistinfo%2fbind-users&c=E,1,T-Az6IiKqV3EjWtoNVj7AwX21luT3ZOuDkT3SeEHy7WqYMFytIOptTjw1UcpKm2j-Vu9lgkBDWcOE3sRUxQQJ_mltRKz8MWVfW6p272kF1A,&typo=1 Harriscomputer Leroy Tennison Network Information/Cyber Security Specialist E: le...@datavoiceint.com [cid:Data-Voice-International-LOGO_aa3d1c6e-5cfb-451f-ba2c-af8059e69609.PNG] 2220 Bush Dr McKinney, Texas 75070 www.datavoiceint.com<http://www..com> This message has been sent on behalf of a company that is part of the Harris Operating Group of Constellation Software Inc. If you prefer not to be contacted by Harris Operating Group please notify us<http://subscribe.harriscomputer.com/>. This message is intended exclusively for the individual or entity to which it is addressed. This communication may contain information that is proprietary, privileged or confidential or otherwise legally exempt from disclosure. If you are not the named addressee, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this message in error, please notify the sender immediately by e-mail and delete all copies of the message.
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