User manual

13.11. DoS Setting
This page allows you to prevent form external attacks.
13.12. IGMP Proxy
Multicasting is useful when the same data needs to be sent to more than one hosts. Using multicasting
as opposed to sending the same data to the individual hosts uses less network bandwidth. The
multicast feature also enables you to receive multicast video stream from multicast servers.
IP hosts use Internet Group Management Protocol (IGMP) to report their multicast group
memberships to neighboring routers. Similarly, multicast routers use IGMP to discover which of their
hosts belong to multicast groups. This device supports IGMP proxy that handles IGMP messages.
When enabled, this device acts as a proxy for a LAN host making requests to join and leave multicast
groups, or a multicast router sending multicast packets to multicast group on the WAN side.
When a host wishes to join a multicast group, it sends IGMP REPORT message to the device’s IGMP
downstream interface. The proxy sets up a multicast route for the interface and host requesting the
video content. It then forwards the Join to the upstream multicast router. The multicast IP traffic will
then be forwarded to the requesting host. On a leave, the proxy removes the route and then forwards
the leave to the upstream multicast router.