Confirmation

[Simon Waters]

"Georgeson, Evan [NCSUS Non J&J]" wrote:
> 
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Can you guys confirm my thinking here...
> 
> $ORIGIN mail-abuse.org.
> rbl-plus        300     IN      SOA     ernie.mail-abuse.org.
> rbl-plus.mail-abuse.org. (
>                 1027617308 600 300 604800 300 )
>         518400  IN      NS      east1.mail-abuse.org.
>         518400  IN      NS      west1.mail-abuse.org.
>         518400  IN      NS      europe1.mail-abuse.org.
>         300     IN      MX      5 mail-abuse.org.
>         300     IN      TXT     "Copyright 2002 Mail Abuse Prevention
> System, LLC."
> 
> Does the above mean that all RR TTLs are overridden to 300 sec?

No, it means that the SOA record will live for 300 seconds (not
that it is used much), the MX and copyright will live for 300
seconds.

The SOA MINTTL means that negative responses will be cached for
300 seconds. So if you aren't listed as a spammer now, you might
be in 5 minutes time, I guess you need the quick refresh as you
could send a lot of spam in 5 or 10 minutes.

If the zone has no $TTL directive on the master, some name
servers might set the default TTL from the MINTTL field, but
that isn't how it should be done.

Specific record TTLs are not "overridden" on the authoritative
servers, although users of those servers are at liberty to throw
responses away earlier than the TTL says if they want to.