BIND 9.9 cannot resolve PTR record but +trace can

Tony Finch dot at dotat.at
Wed Apr 11 13:39:42 UTC 2018


Aras Yorgancı <yorgancia at itu.edu.tr> wrote:
>
> Our BIND 9.9 DNS servers cannot resolve PTR record of a mx server. So We
> cannot established e-mail communication.

This is because the delegation NS records point at CNAMEs, which is not
allowed - if a resolver tries to chase CNAMEs in this situation it can get
into a confusing mess. BIND just refuses to use NS records that point at
CNAMEs.

; <<>> DiG 9.13.0-dev <<>> -x 213.161.131.25 @pri.authdns.ripe.net.

;; AUTHORITY SECTION:
131.161.213.in-addr.arpa. 172800 IN     NS      dns.est.com.tr.
131.161.213.in-addr.arpa. 172800 IN     NS      dns2.est.com.tr.

; <<>> DiG 9.13.0-dev <<>> dns.est.com.tr.

;; ANSWER SECTION:
dns.est.com.tr.         600     IN      CNAME   dns3.est.com.tr.
dns3.est.com.tr.        600     IN      A       213.153.232.20

; <<>> DiG 9.13.0-dev <<>> dns2.est.com.tr.

;; ANSWER SECTION:
dns2.est.com.tr.        600     IN      CNAME   dns4.est.com.tr.
dns4.est.com.tr.        600     IN      A       213.74.122.20

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Dogger, Fisher, German Bight: East or northeast 5 to 7, occasionally gale 8 in
Fisher. Moderate or rough. Showers. Moderate or good.


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