Steffen,
On 18-Jul-23 00:46, Fries, Steffen wrote:
Hi,
I've read the latest version of draft-eckert-anima-grasp-dnssd-05
(https://datatracker.ietf.org/doc/draft-eckert-anima-grasp-dnssd/
<https://datatracker.ietf.org/doc/draft-eckert-anima-grasp-dnssd/>), which has
been updated just recently. It targets provisioning of service discovery information
similar as mDNS but solely relying on GRASP. This approach seems appropriate in
setups in which mDNS is not intended to be used.
It specifically considers the mapping of TXT params, which may be leveraged
also in the current discussion of discovery of BRSKI registrars with enhanced
feature sets. Here, the intention is, to provide additional TXT params to
describe specific services a registrar may offer, like a different enrollment
protocol or support for alternative voucher encodings. While this functionality
is discussed in the context of mDNS (for BRSKI-PRM), it can easily be mapped to
GRASP using the described approach.
That said, I'm not really deep in GRASP, but I think if we currently discuss
service discovery options using mDNS to detect enhanced feature sets for BRSKI
registrars, it would be equally important to have this opportunity also for
ANIs using GRASP instead of mDNS to enable a more specific discovery of
registrars.
Toerless, will it be discussed in the IETF 117 ANIMA session?
I can't answer that, but note that the AN_Proxy and AN_join_registrar
GRASP objectives defined in RFC 8995 include an objective-value field.
For AN_Proxy that field is "any" so is currently undefined and could
be extended in any way we want. For AN_join_registrar it is defined as
objective-value = text ; name of the (list of) supported
; protocols: "EST-TLS" for RFC 7030.
I find that "(list of)" a bit unclear but again there is flexibility
to extend the semantics as we want. In fact that "(list of)" is almost
worth an errata, since I wouldn't know what to write in a program
to implement it.
Regards,
Brian
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