Cloudflare in particular is experimenting with returning different IP addresses to different queries for all kinds of reasons: https://mislove.org/publications/IP-Unbound-SIGCOMM.pdf
On Wed, Sep 22, 2021 at 1:29 PM Warren Kumari <war...@kumari.net> wrote: > > > On Wed, Sep 22, 2021 at 1:01 PM Brown, William <wbr...@e1b.org> wrote: > >> We have a school district that is trying to resolve the domain >> deltamath.com. This issue is impacting the classroom use of this >> service. >> >> >> >> The authoritative servers are tani.ns.cloudflare.com and >> jarred.ns.cloudfare.com. Tani seems to work correctly. Jarred however, >> will return two different results: >> >> >> >> Here are the results of four tries within a few seconds: >> >> >> >> [wbrown@ns3 ~]$ dig @jarred.ns.cloudflare.com deltamath.com +short >> >> 172.67.75.10 >> >> 104.26.2.229 >> >> 104.26.3.229 >> >> [wbrown@ns3 ~]$ dig @jarred.ns.cloudflare.com deltamath.com +short >> >> 104.26.2.229 >> >> 104.26.3.229 >> >> 172.67.75.10 >> >> [wbrown@ns3 ~]$ dig @jarred.ns.cloudflare.com deltamath.com +short >> >> 172.67.75.10 >> >> 104.26.3.229 >> >> 104.26.2.229 >> >> [wbrown@ns3 ~]$ dig @jarred.ns.cloudflare.com deltamath.com +short >> >> 172.64.80.1 >> >> >> >> Is anyone from Cloudflare of the list that can assist with resolving >> this? Anyone have a contact at Cloudflare they can share to get this >> resolved for the school district? >> > > I don't really see the problem here -- all of the addresses returned seem > to be valid CloudFlare addresses, and (I think) that all of them are > answering correctly for deltamath.com. > Nameservers routinely answer with different answers to split the load > between different VIPS, provide answers which they think are "better" for > specific queriers, etc. As long as the servers returned are behaving > correctly, CF can return basically whatever they like. > > Of course, it's entirely possible/likely that I completely misunderstood > the issue/question. > W > > > > > >> >> >> -- >> >> William Brown >> >> WNYRIC/Erie 1 BOCES >> >> 716-821-7285 >> >> >> >> SharePoint, Eforms, Email, Spam Filtering Please reach out to >> messag...@e1b.org >> >> Immediate Needs Call our Service Desk at 716-821-7171 >> >> >> Confidentiality Notice: This electronic message and any attachments may >> contain confidential or privileged information, and is intended only for >> the individual or entity identified above as the addressee. If you are not >> the addressee (or the employee or agent responsible to deliver it to the >> addressee), or if this message has been addressed to you in error, you are >> hereby notified that you may not copy, forward, disclose or use any part of >> this message or any attachments. Please notify the sender immediately by >> return e-mail or telephone and delete this message from your system. >> _______________________________________________ >> dns-operations mailing list >> dns-operations@lists.dns-oarc.net >> https://lists.dns-oarc.net/mailman/listinfo/dns-operations >> > > > -- > The computing scientist’s main challenge is not to get confused by the > complexities of his own making. > -- E. W. Dijkstra > _______________________________________________ > dns-operations mailing list > dns-operations@lists.dns-oarc.net > https://lists.dns-oarc.net/mailman/listinfo/dns-operations > -- http://www.columbia.edu/~ebk2141/
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