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From:Tuc at T-B-O-H Date:September 1 2005 2:56pm
Subject:Re: Connections with bad DNS cause lockups
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> 
> Hello.
> 
> Have a look here:
>   http://dev.mysql.com/doc/mysql/en/dns.html
> 
> You may want to start mysqld with the --skip-name-resolve option.
>
Hi,


	Thanks for the reply.  I did see that page before, but
I guess my bigger question is why if the DNS is broken/slow, why
does the entire server come to a COMPLETE halt, no commands can
be done via either TCP *OR* the socket.  If it just errored, that
session took forever, whatever... I could understand. The problem
is that when it gets probed, it COMPLETELY offlines (DOS) the server.
And just *1* connection!

	Just also seems difficult to keep proper documentation if
we are using IPs and not complete hostnames.


		Thanks, Tuc
> 
> Tuc at T-B-O-H <ml@stripped> wrote:
> > Hi,
> > 
> >        We seem to be running into a problem with our 
> > installation that we don't understand.
> > 
> >        We are running "mysql-server-4.0.25" from
> > the ports collection on a FreeBSD 5.3-RELEASE-p10
> > machine. Its tcpwrapper'd to only allow from our
> > /24, and a single machine outside the /24.
> > 
> >        At times, all of a sudden the server seems
> > to "freeze". It appears that we've narrowed it down
> > to an issue with people attacking the server that
> > come from a site that has a bad reverse DNS setup.
> > 
> >        Has anyone else seen this, or knows how
> > to stop it?
> > 
> >                Thanks, Tuc
> > 
> 
> 
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Thread
Connections with bad DNS cause lockupsTuc at T-B-O-H30 Aug
  • Re: Connections with bad DNS cause lockupsGleb Paharenko31 Aug
    • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H1 Sep
      • Re: Connections with bad DNS cause lockupsSGreen1 Sep
        • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H1 Sep
          • Re: Connections with bad DNS cause lockupsSGreen1 Sep
            • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H1 Sep
      • Re: Connections with bad DNS cause lockupsGleb Paharenko2 Sep
        • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H2 Sep
          • Re: Connections with bad DNS cause lockupsGleb Paharenko3 Sep
            • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H3 Sep
              • Re: Connections with bad DNS cause lockupsGleb Paharenko3 Sep
                • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H3 Sep
                  • Re: Connections with bad DNS cause lockupsGleb Paharenko5 Sep
                    • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H5 Sep
                      • Re: Connections with bad DNS cause lockupsGleb Paharenko5 Sep
                        • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H5 Sep
                    • Re: Connections with bad DNS cause lockupsTuc at T-B-O-H14 Sep