KSB wrote the following on 3/4/2013 12:13 PM:
On 2013.03.04. 20:06, Blake Hudson wrote:
Just hoping to get a consensus on this. Postfix is stating that a host
(in fact several hosts from the same ISP) does not have rDNS, because
our DNS (Bind 9.8) returns SERVFAIL when looking up a PTR record for it.
The IP in question is 63.171.0.212. From my perspective, this IP does
not have a PTR record and as such does not have proper rDNS. Other tools
(including older versions of bind) might say otherwise; What do you say?
--Blake*
*
Seems very, very strage... but probably this is allowed, anybody knows?
;; QUESTION SECTION:
;212.0.171.63.in-addr.arpa. IN PTR
;; ANSWER SECTION:
212.0.171.63.in-addr.arpa. 86400 IN CNAME
63.171.0.212.cust.lkq.sprintlink.net.
63.171.0.212.cust.lkq.sprintlink.net. 86400 IN PTR mail1.lkqcorp.com.
--
KSB
OK, so we ask for a PTR on 212.0.171.63.in-addr.arpa and instead receive
a CNAME (with additional). Did anyone notice that the CNAME does not
resolve?
--
# dig @ns1-auth.sprintlink.net 63.171.0.212.cust.lkq.sprintlink.net
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.4 <<>>
@ns1-auth.sprintlink.net 63.171.0.212.cust.lkq.sprintlink.net
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7207
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;63.171.0.212.cust.lkq.sprintlink.net. IN A
;; AUTHORITY SECTION:
cust.lkq.sprintlink.net. 7200 IN SOA ns1-auth.sprintlink.net.
dns-admin.sprint.net. 2010080301 43200 3600 2419200 7200
;; Query time: 50 msec
;; SERVER: 206.228.179.10#53(206.228.179.10)
;; WHEN: Mon Mar 4 12:04:25 2013
;; MSG SIZE rcvd: 116
--
