Re: SRV query with no domain?

[Niall O'Reilly]

On 16 Aug 2012, at 15:42, Christopher Cain wrote:

> Of course a dig query will fail without the domain appended.  Dig takes
> you query at face value and will not append domains from your search
> suffix list like nslookup and ping will.  You ALWAYS have to fully qualify
> your requests when using dig.

unless you use the +search option ...
/Niall

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Re: SRV query with no domain?

[Christopher Cain]

Of course a dig query will fail without the domain appended.  Dig takes
you query at face value and will not append domains from your search
suffix list like nslookup and ping will.  You ALWAYS have to fully qualify
your requests when using dig.

Chris.

On 12-08-15 3:29 PM, "wbr...@e1b.org"  wrote:

>kevin wrote on 08/15/2012 12:52:18 PM:
>
>> I don't believe SRV lookups use the "search" directive in /etc/
>> resolv.conf; I think that's only for A (name-to-address) lookups.
>> But I could be wrong on that...
>
>Using host I was able to do a search for _sip._tcp for the search domain
>on my system (domain changed to example.org):
>
>wbrown@wbrown-D630:~$ host -t srv _sip._tcp
>_sip._tcp.example.org has SRV record 0 0 5060 tandberg-vcse.example.org.
>wbrown@wbrown-D630:~$ host -t srv _sip._tcp.example.org
>_sip._tcp.example.org has SRV record 0 0 5060 tandberg-vcse.example.org.
>
>Dig fails on same query without domain, succeeds if it is included:
>
>wbrown@wbrown-D630:~$ dig +short  _sip._tcp srv
>wbrown@wbrown-D630:~$ dig +short  _sip._tcp.example.org srv
>0 0 5060 tandberg-vcse.example.org.
>
>
>
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Re: SRV query with no domain?

[WBrown]

kevin wrote on 08/15/2012 12:52:18 PM:

> I don't believe SRV lookups use the "search" directive in /etc/
> resolv.conf; I think that's only for A (name-to-address) lookups. 
> But I could be wrong on that...

Using host I was able to do a search for _sip._tcp for the search domain 
on my system (domain changed to example.org):

wbrown@wbrown-D630:~$ host -t srv _sip._tcp
_sip._tcp.example.org has SRV record 0 0 5060 tandberg-vcse.example.org.
wbrown@wbrown-D630:~$ host -t srv _sip._tcp.example.org
_sip._tcp.example.org has SRV record 0 0 5060 tandberg-vcse.example.org.

Dig fails on same query without domain, succeeds if it is included:

wbrown@wbrown-D630:~$ dig +short  _sip._tcp srv
wbrown@wbrown-D630:~$ dig +short  _sip._tcp.example.org srv
0 0 5060 tandberg-vcse.example.org.



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message has been addressed to you in error, you are hereby notified that 
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Re: SRV query with no domain?

[Thomas Secula]

that's how I understand it also. This DNS query is happening before the
SCSCF would issue an ENUM. I believe it would eventually do this but the
purpose of this dns query is to find the SIP entry point (icscf) into a
domain  for the call.

I think this is either a config issue on my end or a bug. The tel uri is
coming in from an ims subscriber who is registered to the domain. I would
think the P-CSCF would use the domain from the caller for the  dns query.

Thanks for verifying that bind is doing the right thing



On Wed, Aug 15, 2012 at 12:52 PM, Kevin Darcy  wrote:

>  I don't believe SRV lookups use the "search" directive in
> /etc/resolv.conf; I think that's only for A (name-to-address) lookups. But
> I could be wrong on that...
>
> It all comes back to: the client should know what domain contains the
> resources it's looking for. There's fundamentally no such thing as a
> "generic" SRV lookup; SRV lookups are always contextual to a particular
> domain.
>
> As for your point about "tel:" URIs having no domain, I'm no IP telephony
> expert by any stretch of the imagination, but isn't ENUM used to map a
> phone number (as found in a "tel:" URI) to one or more domains for the SRV
> lookup(s)? Or am I way off-base here?
>
>
> - Kevin
>
> On 8/15/2012 12:06 PM, Thomas Secula wrote:
>
> That's what I tried to tell the OpenIMS folks. I have search mydomain
> in/etc/resolv but somehow they aren't adding mydomain to the query. This
> only happens when the  PCSCF tries to find the ICSCF after receiving a SIP
> invite with a TEL uri which by definition has no domain since it's in the
> pstn.
>
>  I don't believe this is a bind issue as I would expect the P-CSCF to get
> that NXDOMAIN and be able to handle it, likely an openims bug.
>
>  thanks for all your replies!!!1
>
> On Wed, Aug 15, 2012 at 10:57 AM, Kevin Darcy  wrote:
>
>>  There's no point in answering a "domain-less" SRV-record query, since
>> the whole point of the SRV record type is to allow clients to find
>> resources associated with a particular domain (and protocol/transport).
>>
>> You need to set the proper domain on the client doing the lookup.
>>
>>
>> - Kevin
>>
>>
>> On 8/15/2012 10:42 AM, Thomas Secula wrote:
>>
>>  Hello,
>>
>>  I hope this is the right list.. I am using bind 9.8.2on centos 6 with a
>> system called openims. I am trying to get my bind server to respond to an
>> SRV query of _sip._udp where the query has no domain. I am told by the
>> openims folks that I should be able to get my bind to respond but I have
>> been unable to.
>> If I do a dig it only works if I have a +search on the request. without
>> teh +search I get NXDOMAIN back.
>>
>>  Is this something I should expect bind to support?
>>
>>  thank you...
>>
>>
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>
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Re: SRV query with no domain?

[Kevin Darcy]

I don't believe SRV lookups use the "search" directive in 
/etc/resolv.conf; I think that's only for A (name-to-address) lookups. 
But I could be wrong on that...


It all comes back to: the client should know what domain contains the 
resources it's looking for. There's fundamentally no such thing as a 
"generic" SRV lookup; SRV lookups are always contextual to a particular 
domain.


As for your point about "tel:" URIs having no domain, I'm no IP 
telephony expert by any stretch of the imagination, but isn't ENUM used 
to map a phone number (as found in a "tel:" URI) to one or more domains 
for the SRV lookup(s)? Or am I way off-base here?


- Kevin
On 8/15/2012 12:06 PM, Thomas Secula wrote:
That's what I tried to tell the OpenIMS folks. I have search mydomain 
in/etc/resolv but somehow they aren't adding mydomain to the query. 
This only happens when the  PCSCF tries to find the ICSCF after 
receiving a SIP invite with a TEL uri which by definition has no 
domain since it's in the pstn.


I don't believe this is a bind issue as I would expect the P-CSCF to 
get that NXDOMAIN and be able to handle it, likely an openims bug.


thanks for all your replies!!!1

On Wed, Aug 15, 2012 at 10:57 AM, Kevin Darcy > wrote:


There's no point in answering a "domain-less" SRV-record query,
since the whole point of the SRV record type is to allow clients
to find resources associated with a particular domain (and
protocol/transport).

You need to set the proper domain on the client doing the lookup.

- Kevin


On 8/15/2012 10:42 AM, Thomas Secula wrote:

Hello,

I hope this is the right list.. I am using bind 9.8.2on centos 6
with a system called openims. I am trying to get my bind server
to respond to an SRV query of _sip._udp where the query has no
domain. I am told by the openims folks that I should be able to
get my bind to respond but I have been unable to.
If I do a dig it only works if I have a +search on the request.
without teh +search I get NXDOMAIN back.

Is this something I should expect bind to support?

thank you...


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Re: SRV query with no domain?

[Thomas Secula]

That's what I tried to tell the OpenIMS folks. I have search mydomain
in/etc/resolv but somehow they aren't adding mydomain to the query. This
only happens when the  PCSCF tries to find the ICSCF after receiving a SIP
invite with a TEL uri which by definition has no domain since it's in the
pstn.

I don't believe this is a bind issue as I would expect the P-CSCF to get
that NXDOMAIN and be able to handle it, likely an openims bug.

thanks for all your replies!!!1

On Wed, Aug 15, 2012 at 10:57 AM, Kevin Darcy  wrote:

>  There's no point in answering a "domain-less" SRV-record query, since
> the whole point of the SRV record type is to allow clients to find
> resources associated with a particular domain (and protocol/transport).
>
> You need to set the proper domain on the client doing the lookup.
>
>
> - Kevin
>
>
> On 8/15/2012 10:42 AM, Thomas Secula wrote:
>
> Hello,
>
>  I hope this is the right list.. I am using bind 9.8.2on centos 6 with a
> system called openims. I am trying to get my bind server to respond to an
> SRV query of _sip._udp where the query has no domain. I am told by the
> openims folks that I should be able to get my bind to respond but I have
> been unable to.
> If I do a dig it only works if I have a +search on the request. without
> teh +search I get NXDOMAIN back.
>
>  Is this something I should expect bind to support?
>
>  thank you...
>
>
> ___
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> from this list
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>
>
>
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Re: SRV query with no domain?

[Kevin Darcy]

There's no point in answering a "domain-less" SRV-record query, since 
the whole point of the SRV record type is to allow clients to find 
resources associated with a particular domain (and protocol/transport).


You need to set the proper domain on the client doing the lookup.

- Kevin

On 8/15/2012 10:42 AM, Thomas Secula wrote:

Hello,

I hope this is the right list.. I am using bind 9.8.2on centos 6 with 
a system called openims. I am trying to get my bind server to respond 
to an SRV query of _sip._udp where the query has no domain. I am told 
by the openims folks that I should be able to get my bind to respond 
but I have been unable to.
If I do a dig it only works if I have a +search on the request. 
without teh +search I get NXDOMAIN back.


Is this something I should expect bind to support?

thank you...


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Re: SRV query with no domain?

[Mark Andrews]

In message 
, Thomas Secula writes:
> 
> Hello,
> 
> I hope this is the right list.. I am using bind 9.8.2on centos 6 with a
> system called openims. I am trying to get my bind server to respond to an
> SRV query of _sip._udp where the query has no domain.

_sip._udp *is* a domain name.  It's no different than
example.net as far as dig is concerned.

> I am told by the
> openims folks that I should be able to get my bind to respond but I have
> been unable to.
> If I do a dig it only works if I have a +search on the request. without teh
> +search I get NXDOMAIN back.
> 
> Is this something I should expect bind to support?
> 
> thank you...
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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Re: SRV query with no domain?

[Phil Mayers]

On 15/08/12 15:42, Thomas Secula wrote:

Hello,

I hope this is the right list.. I am using bind 9.8.2on centos 6 with a
system called openims. I am trying to get my bind server to respond to
an SRV query of _sip._udp where the query has no domain.


Yuck. That's horrible. Are you *sure* that's what you want? You can't 
set the "search" path on the client(s)?



the openims folks that I should be able to get my bind to respond but I
have been unable to.


DNS query names are all full-qualified.

If you *really* want to respond to the name "_sip._udp." (note the 
trailing dot) you'll need a create a zone to contain the name. You can't 
make bind qualify the name for you.


For example:

zone "_udp" {
  type master;
  file "_udp.zone";
};

...and in the zone:

_udp.  IN SOA ...
_sip._udp. IN SRV ...

But this is a bad thing to do; it might cause problems in a number of 
ways down the road, and I strongly recommend you don't do it.


Get your clients to issue fully-qualified DNS name - preferably by 
actually querying a fully-qualified name, alternatively by putting:


search your.domain.com

...in /etc/resolv.conf or the system equivalent.
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SRV query with no domain?

[Thomas Secula]

Hello,

I hope this is the right list.. I am using bind 9.8.2on centos 6 with a
system called openims. I am trying to get my bind server to respond to an
SRV query of _sip._udp where the query has no domain. I am told by the
openims folks that I should be able to get my bind to respond but I have
been unable to.
If I do a dig it only works if I have a +search on the request. without teh
+search I get NXDOMAIN back.

Is this something I should expect bind to support?

thank you...
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