Monitor IP address 255.255.255.255

[Andrew_Quick]

Hi,

I am trying to monitor the DHCP discovery port using the CVI UDP tools. The port is on multicast address 0.0.0.0 (aka 255.255.255.255).

When I try the following;

status = UDPMulticastSubscribe (MDchanHandle, "0.0.0.0", NULL);

It gives me a runtime error telling me that this is not a valid multicast address.

What am I doing wrong?

Thanks

Andy

[Wolfgang]

According to the CVI help valid multicast addresses (Class D) range from 224.0.0.0 to 239.255.255.255.

[Andrew_Quick]

Hi,

I solved it. Basic mistake. 255.255.255.255 is a broadcast address not a multicast address so I just had to set up a UDP unicast channel on the correct port and it will monitor the broadcast data on that port number.

Regards

Andy