On 2 July 2013 14:42, Sam Wilson <sam.wil...@ed.ac.uk> wrote: > Can anyone here give examples of the types of various software that will > not operate without a PTR record?
There have already been numerous listings of software that require reverse lookups. SMTP being the main one. Other services like IRC and some databases (Oracle/MySQL) can also be configured to require properly working reverse lookups. > I agree that if PTR records exist then they should match an A record. > My experience (and IIRC correctly the word of several RFCs) is that PTRs > are not required for most things to work. RFC1912 [http://tools.ietf.org/html/rfc1912] section 2.1... Every Internet-reachable host should have a name... Make sure your PTR and A records match. For every IP address, there should be a matching PTR record in the in-addr.arpa domain. If a host is multi-homed, (more than one IP address) make sure that all IP addresses have a corresponding PTR record (not just the first one). Failure to have matching PTR and A records can cause loss of Internet services similar to not being registered in the DNS at all. Also, PTR records must point back to a valid A record, not a alias defined by a CNAME. Steve _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
