Did you know that almost all linux desktop system comes with avahi pre-installed and turn on by default? What is more interesting is that there are thousands of those machines broadcast in large cooperation without anyone noticing them? I have recently built a multicast dns browser and look into the number of machines running in a large company environment. The number of desktop, laptop and printer machines running multicast dns is far exceeding 1000 machines in the local subnet. They are all happily working fine without causing any issues. Printer works fine, itune sharing from someone else works fine. For some reason, things tend to work better on my side of universe. :) Allen, if you want to get stuck on stone age tools, I won't stop you.
regards, Eric On Wed, Jul 6, 2011 at 4:02 PM, Allen Wittenauer <a...@apache.org> wrote: > > On Jul 5, 2011, at 2:40 AM, Steve Loughran wrote: >> 1. you could use DNS proper, by way of Bonjour/avahi. You don't need to be >> running any mDNS server to support .local, and I would strongly advise >> against it in a large cluster (because .local resolution puts a lot of CPU >> load on every server in the subnet). > > +1 mDNS doesn't scale to large sizes. The only number I've ever heard > is up to 1000 hosts (not services!) before the whole system falls apart. I > don't think it was meant to scale past like a class C subnet. > > Something else to keep in mind: a lot of network gear gets multicast > really really wrong. There are reasons why network admins are very happy > that Hadoop doesn't use multicast. > > ... and all that's before one talks about the security implications.
