Apple's Rendevous protocol is an implementation of the drafts from the IETF zeroconf working group. Basically it broadcasts a packet with a TTL of 1 (or maybe a slightly higher small number in some envrionments, such as corporate networks with small subnets that support routing broadcast packets between subnets) and then waits for a response. This kind of functionality could not be implemented within the framework of the Jabber protocol, since it is 100% peer-to-peer, but there's no reason why clients and servers could not implement the service discovery portion (http://www.dns-sd.org/), allowing a client to find a local server with which to register, and local clients to add to a roster.

If anyone feels like adding this functionality to their client / server, the docs needed are the DNS over IP-multicast internet draft (draft-cheshire-dnsext-multicastdns.txt) and the DNS-Based Service Discovery draft (http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt). (DNS-Based Service Discovery can be used with conventional DNS, but is much less useful.)


Justin Karneges wrote:


Hi all,

I'm sure many of you saw this on slashdot: http://www.trepia.com/

Looks like an interesting idea, and the client reminds me of Rhymbox, but they don't use Jabber. :P :P :P

And an article for ya:
http://slate.msn.com/id/2083733/

It seems it suffers from the usual issues that Jabber does: no users, lame client. Well, at least we are farther along than Trepia. However, something tells me that with all this recent publicity, Trepia will get a ton of users.

IMO, a superior solution could be made using Jabber. No need for Trepia to re-invent the IM client wheel again or waste their converts on a dead-end protocol.

We already have extendable presence, vcards, avatars, browsing ..

Btw, is there an open protocol for detecting LAN/Wi-Fi users? I've heard that Apple's Rendevous can do this, but I don't know anything about it. Trepia has the ability using a similar tactic, I think.

Anyway, I'd like to see a JEP and related server and client implementations by next week, thank you.

-Justin
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