[dnsdist] DnsDist Firefox Issue

[bert hubert]

On Fri, Sep 04, 2015 at 01:25:42PM +0300, Burak Ozalp wrote:
> I actually test in nearly all browsers, including
> Vivaldi-Opera-Firefox version 38, and all reject TCP connections. Is
> it possible that we do something wrong in lua script?

I checked your PCAP, everything is perfect there. I think the browsers are
just not cooperating, or perhaps a firewall is preventing them from reaching
your server on TCP?

	Bert

> 
> addLocal("0.0.0.0:53")
> newServer{address="8.8.8.8"}
> 
> addAction(MaxQPSIPRule(5000), DropAction())
> 
> function blockFilter(remote, qname, qtype, dh)
>         dh:setTC(true)
>         dh:setQR(true)
>         return false
> end
> 
> Thanks!
> 
> Best Regards
> 
> Burak Özalp
> 
> Alinti bert hubert <bert.hubert at netherlabs.nl>
> 
> >Burak,
> >
> >Thank you, but this is the place to report your issues:
> >
> >https://bugzilla.mozilla.org/enter_bug.cgi
> >and
> >https://support.google.com/chrome/answer/95315?hl=en
> >
> >We sadly can't support all software products on the planet from dnsdist ;-)
> >
> >	Bert
> >
> >
> >On Fri, Sep 04, 2015 at 09:23:38AM +0300, Burak Ozalp wrote:
> >>Hi Bert
> >>
> >>Thank you for your interest. Firefox and Chrome DNS operations's
> >>pcap files are attached.
> >>
> >>Best Regards
> >>Burak Ozalp
> >>
> >>Alinti bert hubert <bert.hubert at netherlabs.nl>
> >>
> >>>On Thu, Sep 03, 2015 at 02:24:28PM +0300, Burak Ozalp wrote:
> >>>>Actually, it only works for Ubuntu-Chrome.. In Windows neither
> >>>>Chrome nor Internet Explorer works with these configuration. What
> >>>>could be the reason of this situation ?
> >>>
> >>>Hi Burak,
> >>>
> >>>We estimate that this is an issue that Mozilla and Google might
> >>need to take
> >>>a look at.
> >>>
> >>>We asked a friend at Mozilla and he suggests you file a very detailed bug
> >>>with them, including a tcpdump that shows what happens (UDP query, TC=1
> >>>response, no followup).
> >>>
> >>>On the dns-operations list we also discussed this issue you reported,
> >>>https://lists.dns-oarc.net/pipermail/dns-operations/2015-September/013637.html
> >>>where we learned that Firedox 38 at least on one platform does the right
> >>>thing.
> >>>
> >>>	Bert
> >>>
> >>>
> >>>
> >>>>
> >>>>Best Regards
> >>>>Burak Özalp
> >>>>
> >>>>Alinti Burak Ozalp <burak.ozalp at metu.edu.tr>
> >>>>
> >>>>>
> >>>>>
> >>>>>Yes! It works. When we try with the Chrome Browser it responds
> >>>>>with the TC-bit set and then it automatically retries TCP(looks
> >>>>>great) . However, when we try with Firefox Browser, it only
> >>>>>returns the response and not try with TCP.
> >>>>>
> >>>>>This is our related configurations;
> >>>>>
> >>>>>glibc vesion : 2.13-1
> >>>>>Kernel version : 3.2.0-68-generic
> >>>>>Firefox version: 40.0.3
> >>>>>Chrome version: 43.0.2357.65
> >>>>>--
> >>>>>
> >>>>>Best Regards
> >>>>>Burak Ozalp
> >>>>>
> >>>>>
> >>>>>
> >>>>>Alinti bert hubert <bert.hubert at netherlabs.nl>
> >>>>>
> >>>>>>On Wed, Sep 02, 2015 at 03:52:11PM +0300, Burak Ozalp wrote:
> >>>>>>>Our problem is that we don't know the source address. Our aim is the
> >>>>>>>defence against DDos Attacks, we should limit for all different
> >>>>>>>IP's. As a result, when an attacker attacks our server, we need to
> >>>>>>>not drop innocent requests.
> >>>>>>
> >>>>>>Ok, then do:
> >>>>>>
> >>>>>>addAction(MaxQPSIPRule(5), DropAction())
> >>>>>>
> >>>>>>On the latest packages. Limits each individual IP to 5 QPS, drops beyond
> >>>>>>that.
> >>>>>>
> >>>>>>	Bert
> >>>>>>
> >>>>>>>
> >>>>>>>Best Regards
> >>>>>>>Burak Ozalp
> >>>>>>>
> >>>>>>>Alinti bert hubert <bert.hubert at netherlabs.nl>
> >>>>>>>
> >>>>>>>>On Wed, Sep 02, 2015 at 02:31:33PM +0300, Burak Ozalp wrote:
> >>>>>>>>>Hi Bert;
> >>>>>>>>>
> >>>>>>>>>AddQPS is the best option for us. Is it possible to apply
> >>>>>>>>>addQPSLimit for individual IP's ?
> >>>>>>>>
> >>>>>>>>Yes, as outlined in the documentation ->
> >>>>>>>>https://github.com/PowerDNS/pdns/blob/master/pdns/README-dnsdist.md#per-domain-or-subnet-qps-limiting
> >>>>>>>>
> >>>>>>>>You can add as many subnets as you want, or individual IPs etc.
> >>>>>>>>
> >>>>>>>>Good luck!
> >>>>>>>>
> >>>>>>>>	Bert
> >>>>>>>>
> >>>>>>>>>
> >>>>>>>>>Best Regards
> >>>>>>>>>Burak Ozalp
> >>>>>>>>>
> >>>>>>>>>Alinti bert hubert <bert.hubert at netherlabs.nl>
> >>>>>>>>>
> >>>>>>>>>>On Wed, Sep 02, 2015 at 02:08:38PM +0300, Burak Ozalp wrote:
> >>>>>>>>>>>With the current version of RPM i get no error. However,
> >>>>>>>>>>>addAction(MaxQPSIPRule(5), NoRecurseAction()) , didn't do its job.
> >>>>>>>>>>>Should we use both addQPSLimit and addAction together for limiting
> >>>>>>>>>>>indivual IP to 5 qps?
> >>>>>>>>>>
> >>>>>>>>>>No, addQPSLimit alone is fine. The addAction is only if you
> >>>>>>>>>want to drop the
> >>>>>>>>>>RD-bit for traffic that exceeds the QPS limit.
> >>>>>>>>>>
> >>>>>>>>>>	Bert
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>_______________________________________________
> >>>>>>>>>dnsdist mailing list
> >>>>>>>>>dnsdist at mailman.powerdns.com
> >>>>>>>>>http://mailman.powerdns.com/mailman/listinfo/dnsdist
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>_______________________________________________
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> >>>>>>>http://mailman.powerdns.com/mailman/listinfo/dnsdist
> >>>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
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> >>>>>
> >>>>
> >>>>
> >>>>
> >>>>_______________________________________________
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> >>>>
> >>>
> >>
> >
> >
> >
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> >
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