I am trying to send a packet to several nodes from my PC through a border router. The nodes and the border router are developed using Contiki. The problem is that I cannot send multicast messages because the border router does not forward them to the nodes. Is there any way to solve this?
Edit: I am using IPv6 for routing and the multicat packets are sent using UDP protocol. Moreover the border router interfaces are Ethernet or SLIP (connection to the PC can be made both ways) and 6lowpan over 802.15.4 (connection with the nodes).