Override the local UDP port to bind with.
@item localaddr=@var{addr}
-Choose the local IP address. This is useful e.g. if sending multicast
-and the host has multiple interfaces, where the user can choose
-which interface to send on by specifying the IP address of that interface.
+Local IP address of a network interface used for sending packets or joining
+multicast groups.
@item pkt_size=@var{size}
Set the size in bytes of UDP packets.
the specified peer address/port.
@item sources=@var{address}[,@var{address}]
-Only receive packets sent to the multicast group from one of the
-specified sender IP addresses.
+Only receive packets sent from the specified addresses. In case of multicast,
+also subscribe to multicast traffic coming from these addresses only.
@item block=@var{address}[,@var{address}]
-Ignore packets sent to the multicast group from the specified
-sender IP addresses.
+Ignore packets sent from the specified addresses. In case of multicast, also
+exclude the source addresses in the multicast subscription.
@item fifo_size=@var{units}
Set the UDP receiving circular buffer size, expressed as a number of