RFC 1912, Sec 2.1:
" 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. It is highly recommended that you use some software which automates this checking, or generate your DNS data from a database which automatically creates consistent data."
I have yet to hear a convincing argument why this RFC should be ignored. I have seen many problems when this is ignored.
What about when you're setting up ARPA entries referring to CIDR allocations? as in ... 1.8.5.10.in-addr.arpa. 86400 IN CNAME 1.0/24.8.5.10.in-addr.arpa. Somethings got to give there. I know that you could say well, just put the hostname instead of the target listed above, but the above is often used to delegate ARPA for subnets to downstreams... Karyn
RGDS GARY -------------------------------------------------------------- ------------- Gary E. Miller Rellim 20340 Empire Ave, Suite E-3, Bend, OR 97701 gem@rellim.com Tel:+1(541)382-8588 Fax: +1(541)382-8676