Firewall Protection
150
ProSecure Unified Threat Management (UTM) Appliance
Configure Multicast Pass-through
 To configure multicast pass-through:
1. Select Network Security > Firewall > IGMP. The IGMP screen displays. (The following
figure shows one alternate network as an example.)
Figure 82.
2. In the Multicast Pass through section of the screen, select the Yes radio button to enable
multicast pass-through. (By default the Yes radio button is enabled.)
When you enable multicast pass-through, an Internet Group Management Protocol
(IGMP) proxy is enabled for the upstream (WAN) and downstream (LAN) interfaces. This
proxy allows the UTM to forward relevant multicast traffic from the WAN to the LAN, and
to keep track of the IGMP group membership when LAN hosts join or leave the multicast
group.
3. For multiple WAN port models, if load balancing is configured, select the upstream
interface to which multicast traffic is bound because only a single interface can function as
the upstream interface. From the Bind Upstream interface to drop-down list, select the
interface or the slot (UTM9S only). The default interface is WAN1.
When you change the WAN mode to load balancing, multicast traffic is bound by default
to the active interface of the previous WAN mode.
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