Sending and receiving multicast packets

Check that multicast packets may be sent and received over the tested interface.

Scenarios: X3-SYS05.

1. If tx is TRUE, IUT is sender and Tester is receiver, otherwise - the other way around.

2. Create UDP socket on sender, bind it to a unicast address.

3. Create UDP socket on receiver, bind it to the multicast address mcast_addr.

4. With help of IP_MULTICAST_IF or IPV6_MULTICAST_IF set an outgoing interface for multicast packets for the sender socket.

5. Join the receiver socket to the multicast group of mcast_addr.

6. For sends_num times, send a packet from the sender socket to mcast_addr, receive and check it on the receiver.

Dmitry Izbitsky Dmitry.Izbitsky@oktetlabs.ru

Parameters:

env	Testing environment: env.peer2peer_mcast env.peer2peer_mcast_ipv6
tx	If TRUE, send from IUT to Tester, else - the other way around.
sends_num	How many packets to send: 100