Re: [Possible OT]: dns id in requests

Hi Barry,
Thanks a lot for your reply. I am trying to put dns
server on DMZ and the clients on the inside for a
firewall. The firewall is matching based on ids for
dns traffic and so different requests are being
treated as one for accounting...

Thank you,
-ramnath

--- Barry Margolin <barmar@alum.mit.edu> wrote:

> In article <ch7mh6$1f4a$1@sf1.isc.org>,
> Ramnath Duggirala <ramnath802@yahoo.com> wrote:
>
> > Hi All,
> > I have noticed that the corporate dns server is
> > sending out dns requests with same id but
> different
> > udp src port for consecutive requests. I was under
> the
> > impression that the "dns_id must be different for
> > requests from hostA to serverB as they are used to
> > match requests with responses. The udp src port
> can be
> > same for consecutive requests(this from earlier
> > discussions on bind in this forum)".
>
> Since it's using the port number to match the
> replies with requests, it
> doesn't need to distinguish them using the ID field.
> So this field is
> irrelevant for this client.
>
> Why does it matter?
>
> --
> Barry Margolin, barmar@alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not
> directly to me ***
>
>




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