[AusNOG] Reverse Name Lookup

[Steve Dimitrio]

Hi guys
Anyone from aapt desk online?
The usual channels are getting us no where
Details below





Commencing early morning last Friday Sep 20, most of our nbn IPs are experiencing delays connecting to services which use IP Reverse Name Lookup.



ie ssh has a 15 second delay, mail/smtp has a 35 second delay.



If we disable Reverse Name Lookup in ssh, the delay dissappears.

Not possible to disable Reverse Name Lookup in sendmail.



For the good IPs, host or dig the IP returns a hostname, and host or dig or nslookup the hostname returns the IP.

For the bad IPs, host or dig the IP returns a hostname, and host or dig or nslookup the hostname fails.





27.32.181.22 is OK.



rain:~# host 27.32.181.22

22.181.32.27.in-addr.arpa domain name pointer 27-32-181-22.tpgi.com.au.

rain:~# host 27-32-181-22.tpgi.com.au

27-32-181-22.tpgi.com.au has address 27.32.181.22 rain:~#



59.100.247.50, 210.10.223.90, 59.100.243.186, 203.174.142.86,

203.174.178.46 are not OK.



rain:~# host 59.100.247.50

50.247.100.59.in-addr.arpa domain name pointer 59-100-247-50.mel.static-ipl.aapt.com.au.

rain:~# host 59-100-247-50.mel.static-ipl.aapt.com.au

;; connection timed out; no servers could be reached rain:~#



Similar results with nslookup or dig.



Can you please investigate and restore the hostname lookups.






Steve Dimitrio
Netcore PTY LTD
Office: 03 9725 1469

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