Re: [port-srv-reg] "assigned" ( vs. "registered"), and related issues

[Magnus Westerlund <[e-mail]>]

Olafur Gudmundsson skrev 2010-01-14 15:13:
> At 03:39 13/01/2010, Lars Eggert wrote:
> 
>> > IMO, this basically treats SRV names as old port numbers were treated -
>> > i.e., ask for a name, get ALL transports. That's how port number
>> > assignments were done until recently, where now only the needed
>> > transport is assigned.
>> >
>> > So IMO a service means something only relative to a transport. However,
>> > it'd be useful to require the transport be specified only if the same
>> > name would mean different things for different transports. Do we ever
>> > see that happening?
>>
>> Right. Or, in other words, if you have a service name, it's yours for
>> all transports, just as ports used to be. (There are so many service
>> names that we can burn combinations that aren't used, and limit
>> interactions with IANA.)
>>
>> Lars
> 
> The important point is:
> Each service is going to have one or more transports that are "preferred",
> these preferences need to be noted in the registry.
> (this point applies both to port allocations and service names).
> 
> See section 5.1 of
> http://tools.ietf.org/html/draft-gudmundsson-dnsext-srv-clarify-00
> 
> for proposed search order when priority order is not known.
> 

I thought this was going to be covered in the reference that explains
how the SRV is used with service X. I think that is the most appropriate
place to indicate which protocols are expected to be supported and for
which usages which is the most appropriate.

>From the Service name registry point of view this is not needed
information. However, I agree that for the user of the service name it
is clearly of interest. But as I said before, it is service specific.

Cheers

Magnus Westerlund

IETF Transport Area Director
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