DOS attacked :(

[Rick Cooper]

> -----Original Message-----
> From: MailScanner mailing list
> [mailto:MAILSCANNER at JISCMAIL.AC.UK]On
> Behalf Of Pete
> Sent: Wednesday, March 03, 2004 11:29 PM
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: DOS attacked :(
>
>
> Rick Cooper wrote:
>
> >Sorry to top post, but
> >
> >Are you sure that Net::CIDR is installed ( I think that
> >requirement came after your original install version), and are
> >you using a local caching name server? Slow downs in
> the network
> >test arena are many time caused by resolver problems.
> >
> >
> >
> >
> Have not got internal DNS, all external, and net::cidr is
> installed/updated with rpm mailscanner installation.
>
> But this got me thinking, i tried to ping all the
> servers listed in
> spam.lists.conf and i cannot resolve any, me think its
> is not good.
> Although i can ping almost any other domain name i can
> think of, but not
> any of the spamlist ones. I can ping the
> dcc#.dcc-servers.net found when
> doing cdcc info.
>
> CPAN shell doesnt work cos it cannot resolve the perl sites.
>
> I have changed nothing regarding DNS or networks. I
> assume this is the
> cause/symptom of my problems?
>
> Having spamassassin off is a nightmare and we are
> getting heaps of spam.
>
> --

Run
Makes you wonder if your ISP changed name servers on you, or you
have a firewall problem.

Change /etc/resolv.conf
options ndots:1
nameserver 127.0.0.1
nameserver put current ns1 address here
nameserver put current ns2 address here
multi on

then /etc/init.d/named start
then /etc/init.d/network restart

and try your test again. If your resolver isn't working you will
have *very* slow network tests as you will be waiting for each
outbound to timeout.. with a caching name server running you will
see improvements in many things with your mail service.

Rick