Re: [MIPSHOP-MIH-DT] DNS SRV records

[Vijay Devarapalli <[e-mail]>]

Gabor,

Sure you can use NAPTR records for the mobile node to figure out
the FQDN on which it needs to perform a DNS lookup. But it could
be as simple as the mobile node being configured with either
_mih._udp.example.com or _mih._tcp.example.com. Or perhaps
configured with both. The mobile node will do a DNS lookup on the
first FQDN and then the second one.

If there is no MIH server available in a particular network, the
mobile node won't get any response.

Note that NAPTR is not that widely implemented. So you might want
to make sure that DNS lookup for the MIH server can work without
using NAPTR.

Vijay

[e-mail] wrote:
> Vijay,
> 
> 
> NAPTR records provide a mapping from a domain to the SRV record for
> contacting a server with the specific transport protocol in the NAPTR
> services field.
> 
> The NAPTR record lets you to look at a specific service in a specific
> domain. The response will tell you if whether that domain has a server
> or not, and if yes, what kind of transport protocol and the order of
> preference. Once you have that information, you can construct an SRV
> record to find the server which provides the service with the desired
> transport.
> 
> In the example you gave you made the assumption that the domain hosts an
> mih service using udp.
> 
> - gabor
> 
> -----Original Message-----
> From: ext Vijay Devarapalli [mailto:[e-mail]] 
> Sent: Wednesday, December 05, 2007 11:17 AM
> To: Bajko Gabor (Nokia-SIR/MtView)
> Cc: [e-mail]
> Subject: Re: [MIPSHOP-MIH-DT] DNS SRV records
> 
> [e-mail] wrote:
>> We are using NAPTR records, SRV record is not enough for the 
>> discovery, as we do not know the fqdn of the server(s).
> 
> I am probably missing some context then. I haven't really followed the
> discussions so far. Sorry about that.
> 
> But a question on SRV records. You would be creating a label, something
> like "_mih._udp.example.com". You would then set aside a new SRV record
> for the above label. Then the mobile node would be configured to do a
> DNS lookup based on the above label. example.com can be translated into
> any realm.
> 
> Isn't this sufficient? Not clear why you need NAPTR records.
> 
> Vijay
> 
>> But thanks for the pointer.
>>
>> - gabor
>>  
>>
>> -----Original Message-----
>> From: ext Vijay Devarapalli [mailto:[e-mail]]
>> Sent: Wednesday, December 05, 2007 10:11 AM
>> To: [e-mail]
>> Subject: [MIPSHOP-MIH-DT] DNS SRV records
>>
>> I was chatting with Telemaco this morning and he told me that you guys
> 
>> are writing a draft on reserving a new DNS SRV record.
>> DNS SRV records are not maintained by the IANA (no IETF involvement).
>> The SRV records are maintained at
>>
>> http://www.dns-sd.org/ServiceTypes.html
>>
>> You just need to send an email to add a new SRV record.
>>
>> There is some discussion on using DNS SRV records for MIPv6 home agent
> 
>> lookup. See section 5.1.2 of RFC 5026.
>>
>> Vijay
>>
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>> https://www1.ietf.org/mailman/listinfo/mipshop-mih-dt
> 



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