UDP multicast (unicast / multicast)
UDP outputs are commonly used for LAN distribution and headends.
Unicast vs multicast
- Unicast: one destination IP per receiver.
- Multicast: one multicast group IP for many receivers on the same LAN (requires IGMP-aware network).
Binding multicast to a specific NIC
In multi-NIC deployments (e.g., Internet on LAN1, headend on LAN2), you often need to force multicast traffic out of a specific interface.
Use the format:
LOCAL_INTERFACE_IP@MULTICAST_GROUP_IP
Example:
10.10.134.150@239.2.2.2
Then set the UDP port normally (e.g., :5000 depending on the UI field layout).
Notes for headends
- Ensure the LAN switch/router supports multicast and IGMP.
- Keep multicast distribution inside the LAN (not across the public Internet).
- Validate on a receiver/IRD that joins the group.