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Test IPv4 multicast packets.
Use two programs to send and receive multicast packets. After
setting up the socket, the receiver forks and execs the sender to
avoid races. If the test fails, the receiver runs into a timeout.
The test programs are:
mcsend - send one multicat UDP packet
mcrecv - receive one multicast UDP packet
mcroute - route one multicast UDP packet
The options for mcsend and mcrecv and mcroute are:
-b fork to background after setup
-f file print message to log file, default stdout
-g group multicast group, default 224.0.0.123
-i ifaddr multicast interface address
-l loop disable or enable loopback, 0 or 1
-m message message in payload, maximum 255 characters, default foo
-n timeout expect not to receive any message until timeout
-p port destination port number, default 12345
-o outaddr outgoing interface address
-r timeout receive timeout in seconds
-t ttl set multicast ttl
mcsend ... after setting up receive, fork and exec send command
With mcroute packets are sent over a multicast router. The kernel
route is installed statically. The machines sender, router, receiver
are involved. Receiver is on the local machine, route is on remote
machine. The sender can share the local machine or be started on
a target machine, depending on the setup. This is controlled via
environment.
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