Ah, a more meaty problem to troubleshoot. If you can upgrade to 9.7 firmware,
Bonjour is given higher priority as a well known protocol, where we could only
disable directed multicast to allow free flow of packets between wired/wireless
in earlier releases.
Second, is network analysis, how big is the VLAN/subnet in use? Smaller bcast
domains are recommended. Too many small packets (bcast/mcast/IPv6) can
affect AP performance. Do you segment your client WLAN traffic to individual
VLANs to help reduce the broadcast domain?
That iPhones typically see AppleTVs ok but you have problems with iPads does
point to a client side difference somewhat. Will iPads see AppleTVs on the same
AP ok all the time? How many AppleTVs are there total? IPhones and iPads
may not see as many as the other too, if you have very many.
In general, Jos' configuration comments above should be helpful. If you're having
worse trouble getting iPads working with the AppleTVs, please open a case with
your VAR or Ruckus.