[heroes] reverse mapping of 130.57.5.70 (opensuse.org).
I was looking into the email routing, when I stumbled over this little issue - opensuse.org is 130.57.5.70, which reverse maps to a whole list: ;; ANSWER SECTION: 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.tr. 70.5.57.130.in-addr.arpa. 28714 IN PTR netiq.co.jp. 70.5.57.130.in-addr.arpa. 28714 IN PTR novell.kr. 70.5.57.130.in-addr.arpa. 28714 IN PTR novell.info. 70.5.57.130.in-addr.arpa. 28714 IN PTR icecore.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR icecore.org. 70.5.57.130.in-addr.arpa. 28714 IN PTR kablink.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR icecorps.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR senforce.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR sitescape.biz. 70.5.57.130.in-addr.arpa. 28714 IN PTR sitescape.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR sitescape.net. 70.5.57.130.in-addr.arpa. 28714 IN PTR redirector.novell.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR workloadiq.co.uk. 70.5.57.130.in-addr.arpa. 28714 IN PTR go-evolution.org. 70.5.57.130.in-addr.arpa. 28714 IN PTR novell-cebit.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR powerconvert.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR betterdesktop.org. 70.5.57.130.in-addr.arpa. 28714 IN PTR tagtechnologies.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR mktg.novell.com. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.ae. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.al. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.br. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.co.za. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.dk. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.ee. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.gl. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.gr. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.hu. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.lv. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.mk. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.no. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.biz. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.br. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.gr. 70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.pl. That's just not a proper DNS setup. It's not really important when it's not a mailserver or doesn't use TLS, but a reverse map should only have _one_ result. -- Per Jessen, Zürich (27.1°C) http://www.hostsuisse.com/ - virtual servers, made in Switzerland. -- To unsubscribe, e-mail: heroes+unsubscribe@opensuse.org To contact the owner, e-mail: heroes+owner@opensuse.org
Hi On Mon, 08 Aug 2016 18:49:24 +0200 Per Jessen wrote:
That's just not a proper DNS setup. It's not really important when it's not a mailserver or doesn't use TLS, but a reverse map should only have _one_ result.
Can you point me to the RFC for this? I will forward your concern to our DNS admins... Regards, Lars -- To unsubscribe, e-mail: heroes+unsubscribe@opensuse.org To contact the owner, e-mail: heroes+owner@opensuse.org
Lars Vogdt wrote:
Hi
On Mon, 08 Aug 2016 18:49:24 +0200 Per Jessen wrote:
That's just not a proper DNS setup. It's not really important when it's not a mailserver or doesn't use TLS, but a reverse map should only have _one_ result.
Can you point me to the RFC for this?
I don't believe there is an RFC describing it. From a DNS point of view, having multiple PTR records for one address is perfectly valid, it just doesn't work as expected. The main thing is the client doing the reverse lookup, postfix or a browser for instance. They only use _one_ result, the first one. I have seen this often enough with postfix. http://serverfault.com/questions/618700/why-multiple-ptr-records-in-dns-is-n... (the first two answers). https://en.wikipedia.org/wiki/Reverse_DNS_lookup#Multiple_pointer_records If it were me, I would map 130.57.5.70 to "suse.com", that's all. Or maybe "novell.com". Funny, neither one is in the current list of PTRs :-) best regards Per -- Per Jessen, Zürich (18.4°C) http://www.hostsuisse.com/ - dedicated server rental in Switzerland. -- To unsubscribe, e-mail: heroes+unsubscribe@opensuse.org To contact the owner, e-mail: heroes+owner@opensuse.org
participants (2)
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Lars Vogdt -
Per Jessen