Re: woody firewall broken?
> On Mon, 15 Jul 2002, Davi Leal wrote:
>
> > Well, I will format and reinstall the new firewall again. I am going to
do a
> > 'mondo' backup copy before reintalling so as to check via "mondo
difference
> > reinstalled" what happened in the firewall.
> >
> >
> > P.D.: Do you know if sendmail uses only 25/tcp?. /etc/services does not
> > shows any 25/udp.
>
> The version of sendmail I'm running 8.12.1-5 listens on tcp port 25 and
> also TCP port 587. For details regarding port 587 use, take a look at
> /usr/share/doc/sendmail/RELEASE_NOTES.gz and also RFC 2476. Port 587 is
> used to run a Message Submission Agent which is turned on by default.
>
> As far as I know, sendmail doesn't listen on any UDP ports.
Maybe, I'm not sure, some remote MTAs, for example smtp.navegalia.com, uses
UDP connections. You can try "telnet smtp.navegalia.com 25" behind a
firewall which filter the udp connection.
Regards,
Davi Leal
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