[nbs] Naming details for the API

RJ Atkinson <rja.lists@gmail.com> Thu, 02 December 2010 19:14 UTC

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From: RJ Atkinson <rja.lists@gmail.com>
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Subject: [nbs] Naming details for the API
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Hi,

(I apologise if this entire note is too obvious and
redundant with the existing text.)


A) Service Names

 I would urge that any name-oriented API use "Service Names", 
 in lieu of transport-protocol and port number.

 Section 5 of [1] provides a workable formal definition -- 
 both for the set of valid "Service Name" values and also 
 for the mapping of "Service Name" to a specific 
 (transport-protocol + port number).

 It would also be good if the NBS API documentation urged
 implementations of the API to use DNS SRV records and also
 to look for mDNS/DNS-SD advertisement traffic.  Both mDNS
 & DNS-SD are widely deployed already, for all major OSs 
 (Windows, BSD Unix, Linux, Solaris, MacOS X, iOS, etc.).
 I believe the IETF is currently in Last Call to publish
 both of those specifications on the IETF standards-track.
 In this light, it is probably also worth citing [2] and [3].



2) End-point Names

A) UNICAST:
   DNS FQDNs are the obvious choice here, where local-scope 
   DNS names are also allowed (e.g. host-name.local) -- for
   use with mDNS/DNS-SD.

B) MULTICAST:
   I'm not sure what to do about naming IP multicasting.  
   Clearly multicasting needs to be supported, but the best 
   way to name dynamic IP multicast groups isn't obvious to me.
   I think some convention either exists (or could be created)
   for standardised IP multicast groups (e.g. All routers,
   All hosts, All OSPF routers).


3) Network-Layer Details

 I'd suggest that any name-oriented API be devoid of 
 version-specific or network-protocol-specific details.

 That is, the exact same API ought to work well for all
 of the network-layer protocols active in the IETF/IRTF
 universe these days (e.g. HIP, ILNP, IPv4, IPv6, SHIM6
 [what did I miss ?] -- listed in alphabetical order).

 Omission of CLNP/TP* from the above list is deliberate,
 but only because it has negligible deployment now, and 
 will have less (or zero) deployment in future.


4) Other topics

 I need to think more about things like support for use
 of [ESP, AH], and maybe some other specialised things
 (e.g. transport-protocol-specific nonces).


Cheers,

Ran


REFERENCES:

[1] http://www.ietf.org/id/draft-ietf-tsvwg-iana-ports-09.txt
[2] http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt
[3] http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt