On Thu, 21 Dec 2000, Duncan Bennett wrote:
> ------------------------------------------------------------------------------
> 2000-12-20 00:43:57 recipients from [130.246.192.49] refused (failed to
> find host name from IP address)
> ------------------------------------------------------------------------------
>
> This is confusing because reverse lookups *seem* to work:
It looks like a DNS screwup. At a quick check, it looks like some of the
nameservers have the record, and others don't. For example, this one
doesn't have it:
draco$ dig -x @chilton.rl.ac.uk. 130.246.192.49
; <<>> DiG 2.1 <<>> -x 130.246.192.49
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 6 <<<<<<<<<<<<<<
;; flags: qr aa rd ra; Ques: 1, Ans: 0, Auth: 1, Addit: 0
;; QUESTIONS:
;; 130.246.192.49, type = ANY, class = IN
But my previous, non-specific query gave
draco$ dig -x 130.246.192.49
; <<>> DiG 2.1 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
;; flags: qr rd ra; Ques: 1, Ans: 1, Auth: 6, Addit: 6
;; QUESTIONS:
;; 49.192.246.130.in-addr.arpa, type = ANY, class = IN
;; ANSWERS:
49.192.246.130.in-addr.arpa. 7191 PTR jiscmail.ac.uk.
;; AUTHORITY RECORDS:
246.130.in-addr.arpa. 7191 NS chilton.rl.ac.uk.
246.130.in-addr.arpa. 7191 NS almond.inf.rl.ac.uk.
246.130.in-addr.arpa. 7191 NS letterbox.rl.ac.uk.
246.130.in-addr.arpa. 7191 NS nserv1.dl.ac.uk.
246.130.in-addr.arpa. 7191 NS srsgsv.dl.ac.uk.
246.130.in-addr.arpa. 7191 NS nnsa.dl.ac.uk.
However, I also see
draco$ host 130.246.192.49
130.246.192.49 PTR record not found
> Is Exim correct in its rejection? Am I doing something daft?
I think Exim is probably correct - its DNS lookup failed.
Philip
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
