>Hi,
>
>I'm tracking down a problem where services disappear and re-appear for
>unknown reasons every few hours or so. I noticed in our debug log that
>the callback from mDNS_StartBrowse() is invoked with AddRecord == false
>while the answer->rroriginalttl > 0.
>
>In which case should the service be removed? When AddRecord == false or
>when the TTL reaches 0? The comments in the header file are a little
>ambiguous about this...
>
>Have fun,
>
> Arthur van Hoff
answer->rroriginalttl is the original value that was in the record when
it was received on the wire. (Information that's actually less useful
than one might imagine.)
The best way to dignose this problem is probably with an mDNSNetMonitor
trace.
If the service is *really* not answering queries, then after four failed
queries, it will be removed from the cache. An mDNSNetMonitor trace would
show that.
When you say, "disappear and re-appear", how long is the interval between
disappearing and re-appearing? A second? A minute? (Running "dns-sd -B"
in a terminal window will give you a time-stamped log of when things
appear and disappear.)
Stuart Cheshire <email@hidden>
* Wizard Without Portfolio, Apple Computer, Inc.
* www.stuartcheshire.org
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