组播测试的工具，在Microsoft的网站上，Win2003 Resource Kit 中含有一个mcast.exe文件。
mcast.exe Mcast.exe: Multicast Packet Tool
该程序只有18K，可用于组播流的测试，非常方便。
下面举一个测试的例子：
在发送端（组播源）
C:\>mcast /GRPS:239.1.1.1 /SRCS:10.10.11.128 /NUMPKTS:1000 /INTVL:50 /SEND
其中：/GRPS 指定组播地址
/SRCS 指定组播源地址
/NUMPKTS 指定总共发送组播报文的数目
/INTVL 指定发送组播报文的间隔时间，单位为毫秒
/SEND 配置为发送方
在接收端（组播成员）
C:\>mcast /GRPS:239.1.1.1 /RECV >receive.txt
其中：/RECV 配置为接受方
并将接收的结果记录到receive.txt这个文件中。
Started.... Waiting to receive packets...
Received <1>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <2>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <3>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <4>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <5>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <6>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <7>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <8>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <9>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <10>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <11>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <12>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <13>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <14>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <15>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <16>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <17>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <18>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <19>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <20>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <21>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <22>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <23>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <24>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <25>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <26>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <27>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <28>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <29>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <30>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <31>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <32>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <33>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <34>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <35>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <36>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <37>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Received <38>: SRC- 10.10.11.128 GRP- 239.1.1.1 TTL- 5 Len- 256
Number of Packets Received = 38 Corrupt Packets = 0