Re: Detecting short-TTL domains?

[Leonardo Rodrigues Magalhães]

John D. Hardin escreveu:

On Fri, 10 Aug 2007, Leonardo Rodrigues Magalhães wrote:

    Anyway, checking TTL would require that you always check
domain NSs and not your DNS cache server. That would trash all the
DNS cache traffic save, thus not making it a good idea.

_always_? Not necessarily. That data could be maintained in a local
cache after querying the authoritative server directly. Of course,
that assumes the same short-TTL domain will be sending a lot of spams
to you...

   Seems not trivial, altough it could be made for sure.

--


        Atenciosamente / Sincerily,
        Leonardo Rodrigues
        Solutti Tecnologia
        http://www.solutti.com.br

        Minha armadilha de SPAM, NÃO mandem email
        [EMAIL PROTECTED]
        My SPAMTRAP, do not email it

Well .... at least that would probably require some coding on the DNS Cache server code. As far as i know, the original TTL is never kept, so that information would need to be stored and some new query would have to be created for allowing you to check the original TTL not the 'remaining' one.

smime.p7s
Description: S/MIME Cryptographic Signature