[Infrastructures] ISconf: Cache.py - bcast method

[Daniel Hagerty]

 > Yes, from the sendto call. The machine is just for testing ISCONF. It
 > is a clean install of Ubuntu with simple routing (just gets a dhcp
 > address). I am not using the IS_NETS file and the address that fails
 > is <broadcast>. Also, the call succedes for some number of calls then
 > throws the exception.

    *Which* broadcast?  255.255.255.255, or subnet address all ones?

    Does your OS perchance have any kind of ratelimiting on broadcast
traffic?