Re: udp packet storms
Darren Reed (avalon@coombs.anu.edu.au)
Mon, 31 Oct 1994 22:12:31 +1100 (EDT)
> >
> > To my knowledge, the broadcast trick will not work -- the "broadcast"
> > will not go out on the ethernet or other broadcast address because the
> > broadcast socket option will not have been selected and the packet
> > will not be broadcast in reply. The echo loop between two hosts might,
> > of course...
> >
> > Perry
>
> Run the following program. Try "[name] 255.255.255.255" and
> "[name] X.X.X.255" (assuming 8 bit subnetting). Notice both
> will work properly although I did not do a setsockopt with
> SO_BROADCAST.
>
> Tim N.
I've a feeling this maybe an OS dependency, for some programs I've compiled
to send broadcast packets (such as RPC requests) returned an error on the
send/sendto if a setsockop for SO_BROADCAST wasn't done. This was on
OS/x 5.1 (Pyramid) and I assume it wouldn't have handed you a broadcast
packet unless you asked.
On SunOS 4.1.x I don't need to use setsockopt.
Nor do I need to use it on Solaris 2.3.
Oh HP-UX A.09.03 E, I get "sendto: permission denied" without using
setsockopt to enable SO_BROADCAST.
What about other OS's ?
darren