TTL on glue records and PTR records

[Brad Knowles]

At 11:47 AM -0400 8/26/01, Michele Chubirka wrote:

>  Sorry, but I'm unclear with your response. Are you saying that the TTL for
>  the parent zone, gwu.edu will affect any/all records in the delegated
>  subdomain, va.gwu.edu, even though a different TTL has been set for any/all
>  records in the subdomain?

	No.  The TTLs that are set within the subdomain will over-ride 
what defaults are provided from the SOA.

>                             What's the point then? Also, If what you say is
>  true and my TTL overrides the TTL for any records in the subdomain, why am I
>  getting such odd numbers for the TTL if the default for my zone is 2 hours?

	Your TTL only affects the TTL of the NS records where you 
delegate the sub-zone to him, and the glue records you provide to 
inform people what the IP address(es) are of those delegating 
servers.  The TTLs for everything else will be provided from his 
sub-zone.

>  Why do I get the following output with dig on a query of www.va.gwu.edu from
>  different nameservers running different versions of BIND for the parent
>  zone, gwu.edu?

	In some cases, you are asking the queries of a caching nameserver 
(whatever is configured in /etc/resolv.conf on that machine), and in 
others you are explicitly asking the authoritative nameserver, so it 
answers directly from the official answers you gave it.

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

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