Bind unable to get MX reocrd from Parrent name server

2013-07-05 Thread Fosiul Alam
Hi
Occasionally we see customer is complainning that we are not able to
resolve mx record when mxtoolbox or other website can resolve their mx
record .
If i do a trace on the domain, i get bellow .

now the problem is :
demeter.is.co.za. and babylon.mitsol.co.za does not know anything
about MX record of that domain. but if i query by using  parent name
server ns1.yithosting.co.za. and ns2.yithosting.co.za , it returns the
mx record .

but mxtoolbox, introdns can resolve the mx record although they
complain the same that


The following nameservers are listed at your nameservers as
nameservers for your domain, but are not listed at the parent
nameservers (see RFC2181 5.4.1). You need to make sure that these
nameservers are working.If they are not working ok, you may have
problems!
demeter.is.co.za
babylon.mitsol.co.za

ERROR: One or more of the nameservers listed at the parent servers are
not listed as NS records at your nameservers. The problem NS records
are:
ns1.yithosting.co.za
ns2.yithosting.co.za
This is listed as an ERROR because there are some cases where nasty
problems can occur (if the TTLs vary from the NS records at the root
servers and the NS records point to your own domain, for example).


then why our bind is unable to resolve mx record ???
Thanks for the  help


[root@za-ns-8 ~]# dig  rbcaa.co.za +trace

;  DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4  rbcaa.co.za +trace
;; global options: +cmd
. 447499 IN NS a.root-servers.net.
. 447499 IN NS j.root-servers.net.
. 447499 IN NS l.root-servers.net.
. 447499 IN NS d.root-servers.net.
. 447499 IN NS k.root-servers.net.
. 447499 IN NS g.root-servers.net.
. 447499 IN NS i.root-servers.net.
. 447499 IN NS h.root-servers.net.
. 447499 IN NS m.root-servers.net.
. 447499 IN NS c.root-servers.net.
. 447499 IN NS f.root-servers.net.
. 447499 IN NS e.root-servers.net.
. 447499 IN NS b.root-servers.net.
;; Received 508 bytes from 10.33.91.35#53(10.33.91.35) in 14 ms

za. 172800 IN NS za1.dnsnode.net.
za. 172800 IN NS disa.tenet.ac.za.
za. 172800 IN NS nsza.is.co.za.
za. 172800 IN NS za-ns.anycast.pch.net.
za. 172800 IN NS sns-pb.isc.org.
;; Received 360 bytes from 199.7.83.42#53(199.7.83.42) in 346 ms

co.za. 86400 IN NS ns0.plig.net.
co.za. 86400 IN NS ns.coza.net.za.
co.za. 86400 IN NS ns0.neotel.co.za.
co.za. 86400 IN NS ns1.coza.net.za.
co.za. 86400 IN NS coza1.dnsnode.net.
co.za. 86400 IN NS ns0.is.co.za.
co.za. 86400 IN NS ns4.iafrica.com.
;; Received 266 bytes from 196.4.160.27#53(196.4.160.27) in 285 ms

rbcaa.co.za. 86400 IN NS ns1.yithosting.co.za.
rbcaa.co.za. 86400 IN NS ns2.yithosting.co.za.
;; Received 108 bytes from 196.4.160.17#53(196.4.160.17) in 81 ms

rbcaa.co.za. 14400 IN A 41.203.1.156
rbcaa.co.za. 86400 IN NS demeter.is.co.za.
rbcaa.co.za. 86400 IN NS babylon.mitsol.co.za.
;; Received 99 bytes from 41.203.1.158#53(41.203.1.158) in 41 ms
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Re: Bind unable to get MX reocrd from Parrent name server

2013-07-05 Thread Steven Carr
Your glue is broken. You need to update the glue NS records in the
parent to reflect the actual nameservers that are authoritative for
the zone.

It also looks like you could have some data mismatch between zones
hosted on (ns1.yithosting.co.za + ns2.yithosting.co.za) and
(demeter.is.co.za + babylon.mitsol.co.za). Check that the zone data is
consistent across the nameservers.

Steve

On 5 July 2013 12:35, Fosiul Alam fos...@gmail.com wrote:
 Hi
 Occasionally we see customer is complainning that we are not able to
 resolve mx record when mxtoolbox or other website can resolve their mx
 record .
 If i do a trace on the domain, i get bellow .

 now the problem is :
 demeter.is.co.za. and babylon.mitsol.co.za does not know anything
 about MX record of that domain. but if i query by using  parent name
 server ns1.yithosting.co.za. and ns2.yithosting.co.za , it returns the
 mx record .

 but mxtoolbox, introdns can resolve the mx record although they
 complain the same that

 
 The following nameservers are listed at your nameservers as
 nameservers for your domain, but are not listed at the parent
 nameservers (see RFC2181 5.4.1). You need to make sure that these
 nameservers are working.If they are not working ok, you may have
 problems!
 demeter.is.co.za
 babylon.mitsol.co.za

 ERROR: One or more of the nameservers listed at the parent servers are
 not listed as NS records at your nameservers. The problem NS records
 are:
 ns1.yithosting.co.za
 ns2.yithosting.co.za
 This is listed as an ERROR because there are some cases where nasty
 problems can occur (if the TTLs vary from the NS records at the root
 servers and the NS records point to your own domain, for example).
 

 then why our bind is unable to resolve mx record ???
 Thanks for the  help


 [root@za-ns-8 ~]# dig  rbcaa.co.za +trace

 ;  DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4  rbcaa.co.za +trace
 ;; global options: +cmd
 . 447499 IN NS a.root-servers.net.
 . 447499 IN NS j.root-servers.net.
 . 447499 IN NS l.root-servers.net.
 . 447499 IN NS d.root-servers.net.
 . 447499 IN NS k.root-servers.net.
 . 447499 IN NS g.root-servers.net.
 . 447499 IN NS i.root-servers.net.
 . 447499 IN NS h.root-servers.net.
 . 447499 IN NS m.root-servers.net.
 . 447499 IN NS c.root-servers.net.
 . 447499 IN NS f.root-servers.net.
 . 447499 IN NS e.root-servers.net.
 . 447499 IN NS b.root-servers.net.
 ;; Received 508 bytes from 10.33.91.35#53(10.33.91.35) in 14 ms

 za. 172800 IN NS za1.dnsnode.net.
 za. 172800 IN NS disa.tenet.ac.za.
 za. 172800 IN NS nsza.is.co.za.
 za. 172800 IN NS za-ns.anycast.pch.net.
 za. 172800 IN NS sns-pb.isc.org.
 ;; Received 360 bytes from 199.7.83.42#53(199.7.83.42) in 346 ms

 co.za. 86400 IN NS ns0.plig.net.
 co.za. 86400 IN NS ns.coza.net.za.
 co.za. 86400 IN NS ns0.neotel.co.za.
 co.za. 86400 IN NS ns1.coza.net.za.
 co.za. 86400 IN NS coza1.dnsnode.net.
 co.za. 86400 IN NS ns0.is.co.za.
 co.za. 86400 IN NS ns4.iafrica.com.
 ;; Received 266 bytes from 196.4.160.27#53(196.4.160.27) in 285 ms

 rbcaa.co.za. 86400 IN NS ns1.yithosting.co.za.
 rbcaa.co.za. 86400 IN NS ns2.yithosting.co.za.
 ;; Received 108 bytes from 196.4.160.17#53(196.4.160.17) in 81 ms

 rbcaa.co.za. 14400 IN A 41.203.1.156
 rbcaa.co.za. 86400 IN NS demeter.is.co.za.
 rbcaa.co.za. 86400 IN NS babylon.mitsol.co.za.
 ;; Received 99 bytes from 41.203.1.158#53(41.203.1.158) in 41 ms
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Re: Bind unable to get MX reocrd from Parrent name server

2013-07-05 Thread Fosiul Alam
Hi
thanks for reply,
I am not the domain admin for rbcaa.co.za
I can see they have issue with their domain setup .
but what I want to know is :
when all Dns server can resolved their mx record example ,
mxtoolbox,introdns,google .. (Despite they have issue with their dns
setup for that domain (as you said) ) then why we cant ??

Thanks for looking into it .

On Fri, Jul 5, 2013 at 12:45 PM, Steven Carr sjc...@gmail.com wrote:
 Your glue is broken. You need to update the glue NS records in the
 parent to reflect the actual nameservers that are authoritative for
 the zone.

 It also looks like you could have some data mismatch between zones
 hosted on (ns1.yithosting.co.za + ns2.yithosting.co.za) and
 (demeter.is.co.za + babylon.mitsol.co.za). Check that the zone data is
 consistent across the nameservers.

 Steve

 On 5 July 2013 12:35, Fosiul Alam fos...@gmail.com wrote:
 Hi
 Occasionally we see customer is complainning that we are not able to
 resolve mx record when mxtoolbox or other website can resolve their mx
 record .
 If i do a trace on the domain, i get bellow .

 now the problem is :
 demeter.is.co.za. and babylon.mitsol.co.za does not know anything
 about MX record of that domain. but if i query by using  parent name
 server ns1.yithosting.co.za. and ns2.yithosting.co.za , it returns the
 mx record .

 but mxtoolbox, introdns can resolve the mx record although they
 complain the same that

 
 The following nameservers are listed at your nameservers as
 nameservers for your domain, but are not listed at the parent
 nameservers (see RFC2181 5.4.1). You need to make sure that these
 nameservers are working.If they are not working ok, you may have
 problems!
 demeter.is.co.za
 babylon.mitsol.co.za

 ERROR: One or more of the nameservers listed at the parent servers are
 not listed as NS records at your nameservers. The problem NS records
 are:
 ns1.yithosting.co.za
 ns2.yithosting.co.za
 This is listed as an ERROR because there are some cases where nasty
 problems can occur (if the TTLs vary from the NS records at the root
 servers and the NS records point to your own domain, for example).
 

 then why our bind is unable to resolve mx record ???
 Thanks for the  help


 [root@za-ns-8 ~]# dig  rbcaa.co.za +trace

 ;  DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4  rbcaa.co.za +trace
 ;; global options: +cmd
 . 447499 IN NS a.root-servers.net.
 . 447499 IN NS j.root-servers.net.
 . 447499 IN NS l.root-servers.net.
 . 447499 IN NS d.root-servers.net.
 . 447499 IN NS k.root-servers.net.
 . 447499 IN NS g.root-servers.net.
 . 447499 IN NS i.root-servers.net.
 . 447499 IN NS h.root-servers.net.
 . 447499 IN NS m.root-servers.net.
 . 447499 IN NS c.root-servers.net.
 . 447499 IN NS f.root-servers.net.
 . 447499 IN NS e.root-servers.net.
 . 447499 IN NS b.root-servers.net.
 ;; Received 508 bytes from 10.33.91.35#53(10.33.91.35) in 14 ms

 za. 172800 IN NS za1.dnsnode.net.
 za. 172800 IN NS disa.tenet.ac.za.
 za. 172800 IN NS nsza.is.co.za.
 za. 172800 IN NS za-ns.anycast.pch.net.
 za. 172800 IN NS sns-pb.isc.org.
 ;; Received 360 bytes from 199.7.83.42#53(199.7.83.42) in 346 ms

 co.za. 86400 IN NS ns0.plig.net.
 co.za. 86400 IN NS ns.coza.net.za.
 co.za. 86400 IN NS ns0.neotel.co.za.
 co.za. 86400 IN NS ns1.coza.net.za.
 co.za. 86400 IN NS coza1.dnsnode.net.
 co.za. 86400 IN NS ns0.is.co.za.
 co.za. 86400 IN NS ns4.iafrica.com.
 ;; Received 266 bytes from 196.4.160.27#53(196.4.160.27) in 285 ms

 rbcaa.co.za. 86400 IN NS ns1.yithosting.co.za.
 rbcaa.co.za. 86400 IN NS ns2.yithosting.co.za.
 ;; Received 108 bytes from 196.4.160.17#53(196.4.160.17) in 81 ms

 rbcaa.co.za. 14400 IN A 41.203.1.156
 rbcaa.co.za. 86400 IN NS demeter.is.co.za.
 rbcaa.co.za. 86400 IN NS babylon.mitsol.co.za.
 ;; Received 99 bytes from 41.203.1.158#53(41.203.1.158) in 41 ms
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-- 
Regards
Fosiul Alam
07877100621
http://www.fosiul.co.uk
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Re: Bind unable to get MX reocrd from Parrent name server

2013-07-05 Thread Matus UHLAR - fantomas

On 05.07.13 12:59, Fosiul Alam wrote:

I am not the domain admin for rbcaa.co.za
I can see they have issue with their domain setup .
but what I want to know is :
when all Dns server can resolved their mx record example ,
mxtoolbox,introdns,google .. (Despite they have issue with their dns
setup for that domain (as you said) ) then why we cant ??


because some kinds of DNS problems, especially this one (incosistent NS
between parent zone delegation and the zone itself) often lead to this kind
of issues. 


In your example, the NS servers in the zone rbcaa.co.za refuse queries for
the zone, so any server that caches the NS records will fail as long.

The reason why services like mxtoolbox work is that they apparently do not
behave as standard (rfc-conforming) DNS clients, they trace those domains to
catch those issues. For example:

http://www.intodns.com/rbcaa.co.za

clearly says there are ERRORS in the domain. I really do not think that this
should be interpreted as they can resolve. Other DNS checker also says:

No name servers found at child.

Not enough nameserver information was found to test the zone
rbcaa.co.za, but an IP address lookup succeeded in spite of that.

http://dnscheck.iis.se/?time=1373027394id=3521288view=basictest=standard


rbcaa.co.za. 86400 IN NS ns1.yithosting.co.za.
rbcaa.co.za. 86400 IN NS ns2.yithosting.co.za.
;; Received 108 bytes from 196.4.160.17#53(196.4.160.17) in 81 ms

rbcaa.co.za. 14400 IN A 41.203.1.156
rbcaa.co.za. 86400 IN NS demeter.is.co.za.
rbcaa.co.za. 86400 IN NS babylon.mitsol.co.za.
;; Received 99 bytes from 41.203.1.158#53(41.203.1.158) in 41 ms


% dig any rbcaa.co.za. @babylon.mitsol.co.za.

;  DiG 9.8.4-rpz2+rl005.12-P1  any rbcaa.co.za.
; @babylon.mitsol.co.za.
;; global options: +cmd
;; Got answer:
;; -HEADER- opcode: QUERY, status: REFUSED, id: 40276
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

% dig +norec any rbcaa.co.za. @babylon.mitsol.co.za.

;  DiG 9.8.4-rpz2+rl005.12-P1  +norec any rbcaa.co.za.
; @babylon.mitsol.co.za.
;; global options: +cmd
;; Got answer:
;; -HEADER- opcode: QUERY, status: REFUSED, id: 52980
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0


--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Save the whales. Collect the whole set.
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Re: Bind unable to get MX reocrd from Parrent name server

2013-07-05 Thread John Wobus

The other DNS server software is working around or ignoring
the issues.  Server software varies in how much it ignores or
works around bad domain setups.  Also, in some situations,
configuration problems result in symptoms that come and go.

One reason DNS software is picky about correct setups is security:
ignoring some configuration issues increases the chance
of passing along bad, possibly malicious answers.  Bind is
apparently pickier than some other DNS server software.
I have to believe some public resolvers have considerable extra
logic to try to partially validate and use domains that
are incorrectly set up.

The ideal way to fix the issue is to get the owner of
the domain to fix it.

John
Cornell University IT

On Jul 5, 2013, at 7:59 AM, Fosiul Alam wrote:


Hi
thanks for reply,
I am not the domain admin for rbcaa.co.za
I can see they have issue with their domain setup .
but what I want to know is :
when all Dns server can resolved their mx record example ,
mxtoolbox,introdns,google .. (Despite they have issue with their dns
setup for that domain (as you said) ) then why we cant ??

Thanks for looking into it .

On Fri, Jul 5, 2013 at 12:45 PM, Steven Carr sjc...@gmail.com wrote:

Your glue is broken. You need to update the glue NS records in the
parent to reflect the actual nameservers that are authoritative for
the zone.

It also looks like you could have some data mismatch between zones
hosted on (ns1.yithosting.co.za + ns2.yithosting.co.za) and
(demeter.is.co.za + babylon.mitsol.co.za). Check that the zone data  
is

consistent across the nameservers.

Steve

On 5 July 2013 12:35, Fosiul Alam fos...@gmail.com wrote:

Hi
Occasionally we see customer is complainning that we are not able to
resolve mx record when mxtoolbox or other website can resolve  
their mx

record .
If i do a trace on the domain, i get bellow .

now the problem is :
demeter.is.co.za. and babylon.mitsol.co.za does not know anything
about MX record of that domain. but if i query by using  parent name
server ns1.yithosting.co.za. and ns2.yithosting.co.za , it returns  
the

mx record .

but mxtoolbox, introdns can resolve the mx record although they
complain the same that


The following nameservers are listed at your nameservers as
nameservers for your domain, but are not listed at the parent
nameservers (see RFC2181 5.4.1). You need to make sure that these
nameservers are working.If they are not working ok, you may have
problems!
demeter.is.co.za
babylon.mitsol.co.za

ERROR: One or more of the nameservers listed at the parent servers  
are

not listed as NS records at your nameservers. The problem NS records
are:
ns1.yithosting.co.za
ns2.yithosting.co.za
This is listed as an ERROR because there are some cases where nasty
problems can occur (if the TTLs vary from the NS records at the root
servers and the NS records point to your own domain, for example).


then why our bind is unable to resolve mx record ???
Thanks for the  help


[root@za-ns-8 ~]# dig  rbcaa.co.za +trace

;  DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4  rbcaa.co.za  
+trace

;; global options: +cmd
. 447499 IN NS a.root-servers.net.
. 447499 IN NS j.root-servers.net.
. 447499 IN NS l.root-servers.net.
. 447499 IN NS d.root-servers.net.
. 447499 IN NS k.root-servers.net.
. 447499 IN NS g.root-servers.net.
. 447499 IN NS i.root-servers.net.
. 447499 IN NS h.root-servers.net.
. 447499 IN NS m.root-servers.net.
. 447499 IN NS c.root-servers.net.
. 447499 IN NS f.root-servers.net.
. 447499 IN NS e.root-servers.net.
. 447499 IN NS b.root-servers.net.
;; Received 508 bytes from 10.33.91.35#53(10.33.91.35) in 14 ms

za. 172800 IN NS za1.dnsnode.net.
za. 172800 IN NS disa.tenet.ac.za.
za. 172800 IN NS nsza.is.co.za.
za. 172800 IN NS za-ns.anycast.pch.net.
za. 172800 IN NS sns-pb.isc.org.
;; Received 360 bytes from 199.7.83.42#53(199.7.83.42) in 346 ms

co.za. 86400 IN NS ns0.plig.net.
co.za. 86400 IN NS ns.coza.net.za.
co.za. 86400 IN NS ns0.neotel.co.za.
co.za. 86400 IN NS ns1.coza.net.za.
co.za. 86400 IN NS coza1.dnsnode.net.
co.za. 86400 IN NS ns0.is.co.za.
co.za. 86400 IN NS ns4.iafrica.com.
;; Received 266 bytes from 196.4.160.27#53(196.4.160.27) in 285 ms

rbcaa.co.za. 86400 IN NS ns1.yithosting.co.za.
rbcaa.co.za. 86400 IN NS ns2.yithosting.co.za.
;; Received 108 bytes from 196.4.160.17#53(196.4.160.17) in 81 ms

rbcaa.co.za. 14400 IN A 41.203.1.156
rbcaa.co.za. 86400 IN NS demeter.is.co.za.
rbcaa.co.za. 86400 IN NS babylon.mitsol.co.za.
;; Received 99 bytes from 41.203.1.158#53(41.203.1.158) in 41 ms
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--
Regards
Fosiul Alam
07877100621
http://www.fosiul.co.uk
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bind-users 

Re: How to suppress ADDITIONAL SECTION per zone

2013-07-05 Thread John Wobus

Other possibility is to implement packet rate limiting - a patch was
discussed here a few days/weeks ago.


I endorse this suggestion: we were faced with such attacks and were
naturally leery about issues we might run into running a patched bind
and the additional tuning it could require.  Our experience is: the RRL
patch, used with its default parameters, simply does the job.

John
Cornell University IT
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Re: How to suppress ADDITIONAL SECTION per zone

2013-07-05 Thread Vernon Schryver
 From: John Wobus jw...@cornell.edu

  Other possibility is to implement packet rate limiting - a patch was
  discussed here a few days/weeks ago.

 I endorse this suggestion: we were faced with such attacks and were
 naturally leery about issues we might run into running a patched bind
 and the additional tuning it could require.  Our experience is: the RRL
 patch, used with its default parameters, simply does the job.

(thanks for the good new.)

See http://www.redbarn.org/dns/ratelimits


Vernon Schryverv...@rhyolite.com
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Re: Reverse address entries

2013-07-05 Thread John Wobus

On Jun 28, 2013, at 3:54 PM, Ward, Mike S wrote:
I want to thank everyone for their input. It sounds like they do  
need the reverse address entries in specific circumstances so I’m  
going to recommend that they add them.


Lack of reverse records made a big difference in the distant past.
Now, I suspect the percentage of situations is much reduced,
but of course the sheer number of users/uses of the Internet is
higher.

I have a suspicion that the deployment of IPV6 will kill off
using reverse lookups for validation.  Of course DNS supports
IPV6 reverse records, but IPV6 poses challenges for some
DNS strategies, e.g. setting up static placeholder DNS records
for each address in a dynamically-addressed subnet.

John
Cornell University IT


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RRL and avoiding contributing to DDoS (Was: How to suppress ADDITIONAL SECTION per zone)

2013-07-05 Thread Dave Warren

On 2013-07-05 07:21, John Wobus wrote:

I endorse this suggestion: we were faced with such attacks and were
naturally leery about issues we might run into running a patched bind
and the additional tuning it could require.  Our experience is: the RRL
patch, used with its default parameters, simply does the job.



I haven't been following the RRL discussions too closely, is this patch 
scheduled to be included in BIND9 proper or will it remain a patch?


We generally prefer to avoid unsupported (third party) patches, 
although I am working on getting an exception through for this 
particular situation, but if it's scheduled for inclusion in the nearish 
future, we may wait.


In the mean time, would it make sense to set minimal-responses yes 
proactively, or only if a spike of activity is detected (noting that it 
will take us 1-3 days to notice a spike unless it's disruptive to 
performance)


--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren

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Re: RRL and avoiding contributing to DDoS (Was: How to suppress ADDITIONAL SECTION per zone)

2013-07-05 Thread Vernon Schryver
 From: Dave Warren da...@hireahit.com

 I haven't been following the RRL discussions too closely, is this patch 
 scheduled to be included in BIND9 proper or will it remain a patch?

} From: Evan Hunt each at isc.org 

}  It's not built into bind (yet).
}
} Correct.  For the record, it'll be in 9.10.0 by default and 9.9.4 as a
} compile-time option (--enable-rrl).

https://lists.isc.org/pipermail/bind-users/2013-June/090872.html


 In the mean time, would it make sense to set minimal-responses yes 
 proactively, or only if a spike of activity is detected (noting that it 
 will take us 1-3 days to notice a spike unless it's disruptive to 
 performance)

Depending on your DNS data, a minimal response offers bad guys
between significant and more than enough amplification for a DNS
reflection attack.  While a minimal-responses yes without RRL DNS
server is participating in a DNS reflection attack, it can be sending
a lot of bits/second.  Some DNS servers are not bothered by few
extra Gbit/sec of DNS output bandwidth, but many are

In other words, as I see them, as DNS reflection mitigation,
minimal-responses yes is like blocking ANY,
just wishful thinking.


Vernon Schryverv...@rhyolite.com
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