Howto send a limited broadcast?

Bruce M. Simpson bms at FreeBSD.org
Sat Apr 12 23:37:46 UTC 2008


tmm wrote:
> So, can anyone suggest how I can send a limited broadcast (on an 
> interface that has been initalized with an IP and a subnet)?

Use the IP_ONESBCAST option and send to the network broadcast address 
for that subnet. The stack will change it into 255.255.255.255 on 
output. See man page ip(4) for details.

It's a hack, but it's largely due to how the stack has worked historically.

BMS


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