TTL on glue records and PTR records

[Brad Knowles]

At 11:51 AM -0400 8/25/01, chubirka wrote:

>  I'm a parent zone, gwu.edu, and I've been having a discussion with one of the
>  admins of my delegated subdomains, va.gwu.edu, regarding a couple of issues:

	Hi!  ;-)

>  1. I thought that my zone TTL only affected the glue records of the delegated
>  subdomain, NOT the entire zone. Doesn't the SOA information in the zone file
>  of the delegated subdomain set the TTL for all records in the subdomain?

	You set a default TTL for all records in the zone with a $TTL 
directive at the top of the zone file.  For BIND 8, if you fail to 
use this directive, it will use the "negative" TTL (used to be the 
"minimum" TTL) field within the SOA record as the default TTL.

	However, you can always over-ride the default TTL with an 
explicit TTL for specific records.

>  2. He has multiple "A" record names pointing to the same IP addresses for his
>  nameservers, but his "PTR" records (of course)only indicate ONE "A" record or
>  canonical name. He initially wanted me to use the names which DON'T 
>coordinate
>  with the "PTR" records and this was seen as an error by various 
>error checking
>  programs, so I reverted to the canonical names which had the coordinating
>  "PTR" records. He seems to think this is unimportant, but I prefer to avoid
>  this kind of error whenever possible (The entire subnet where the nameservers
>  reside is also delegated to this administrator).

	You are correct.  Make sure they match, just to try to help 
ensure that you avoid creating more serious problems in the future.

-- 
Brad Knowles, <brad.knowles at skynet.be>

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