jonas wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Mon, Apr 20, 2009 at 09:45:28AM -0400, p...@laptop.org wrote: > >benjamin m. schwartz wrote: > > > Martin Langhoff wrote: > > > > The short of it is that mdns/dns-sd make sense for a small, > > > > underutilised network of peers. They assume that the network is a > > > > cheap resource, that broadcast messages are cheap, and that there > > > > is no coordinating server. > > > > > > mDNS assumes all of the above things. DNS-SD does not. DNS-SD is > > > perfectly happy to work on a standard DNS server. From the spec > > > > > > """ > > > This document proposes no change to the structure of DNS > > > messages, and no new operation codes, response codes, resource > > > record types, or any other new DNS protocol values. This document > > > simply specifies a convention for how existing resource record > > > types can be named and structured to facilitate service > > > discovery. > > > """ > > > (http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt) > > > >the last i looked at (and actually used) dns-sd to solve the > >discovery problem, it seemed that dns-sd development had stalled. > >(and i haven't had a reason to look since.) i believe we used > >code from Sun, which was all i could find at the time, and it > >wasn't what you'd call production ready. on the other hand, we > >were using it in a somewhat non-standard way -- in fact, we > >switched to mdns soon after because it fit our deployment model > >better, since we didn't really have a central server. the XS > >model may be a better fit. > > > >(this was all 3 or 4 years ago, btw.) > > Here's my understanding: > > * DNS-SD is a formalized use of DNS records to store services > (rather than hosts, the most popular use of DNS records). > > * mDNS is DNS over multicast (using DNS-SD to resolve services).
sigh. please disregard everything i wrote in the paragraph above. i was mistakenly referring to DNS-SD when i should have been referring to SLP ("service location protocol"). we migrated from SLP to mDNS. this has nothing to do with anything martin has proposed for the XS. sorry! :-) paul > > So it seems to me that if you've switched from DNS-SD to mDNS, then in > fact you are still relying on DNS-SD, just using an additional layer on > top of it. > > A good introduction (assumably more reliable than Wikipedia) is > http://www.dns-sd.org/ > > > - Jonas > =--------------------- paul fox, p...@laptop.org _______________________________________________ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel