[rbldnsd] RFC: Data expire support

[Jeff Chan]

On Monday, December 19, 2005, 12:11:17 AM, Michael Tokarev wrote:
> Recently I received several questions/requests about supporting
> "data expire" thing in rbldnsd.  The scenario is rather common:
> some nameserver of a large/widely used blocklist, sich as dsbl.org,
> for whatever reason stops updating the data and rbldnsd happily
> continues to answer queries with old, stale data => people start
> screaming "we've been out of the blocklist for a while but our
> mail is still being rejected!".

> So, after several small discussions here and there, we come across
> this simple idea: a data file may contain an 'expire marker', ie,
> a timestamp indicating when the data becomes invalid.

> Yes there is `expire' field in the SOA record, which is not used
> currently, but I'm for another way to specify this expire time,
> because of several reasons:

Your ideas are interesting, but I would suggest applying the
SOA expire time to the last time the file updated, if possible.
rbldnsd should have a concept of the file updating, if I'm
understanding things correctly.  In other words, do what the
expire *should* do.

Cheers,

Jeff C.
-- 
Jeff Chan
mailto:jeffc at surbl.org
http://www.surbl.org/