Fortinet FortiGate 1U Quick Start Manual page 106

Adding multicast security
policies
Go to Policy > Policy > Multicast Policy.
Create a policy to allow multicast traffic from
the LAN and WLAN1 for AppleTV to iOS
devices. Set Incoming Interface to LAN,
Source Address to the Internal network,
Outgoing Interface to the SSID, and
Destination Address to Bonjour.
The Bonjour address allows the devices to
find each other when they connect
through the FortiGate unit.
Go to Policy > Policy > Multicast Policy.
Create a policy to allow multicast traffic
from the WLAN1 and LAN for iOS devices
to AppleTV. Set Incoming Interface to
the SSID, Source Address to the SSID
IP, Outgoing Interface to LAN, and
Destination Address to Bonjour.
86 The FortiGate Cookbook 5.0.