Vadym Stetsyak wrote:
?? Yes it does...

If your subnet is 10.10.10.*, then that subnet's broadcast address is
10.10.10.255.

Actually you're right, TCP doesn't define broadcasting, IP does, because
IP defines addressing. TCP is a transmission protocol, IP is the
addressing protocol.

So yeah, neither UDP or TCP support broadcasting, its IP that supports it.

But if you're trying to say that you can't send a TCP message to a
broadcast address, you're wrong. Back in the day before broadcast
floods were common, could ping the .255 address on your network and
watch dozens and dozens of ping responses come back. Nowadays broadcast
addresses don't make it through routers at all.

jeremiah

jeremiah johnson wrote:

Hello, jeremiah!

jj> But if you're trying to say that you can't send a TCP message to a
jj> broadcast address, you're wrong. Back in the day before broadcast
jj> floods were common, could ping the .255 address on your network and
jj> watch dozens and dozens of ping responses come back. Nowadays
jj> broadcast addresses don't make it through routers at all.

ICMP is not TCP. Yes you can send connection request to broadcast address, but connection is an atomic thing you cannot maintain broadcast connection, so trying to connect to "xxx.xxx.xxx.255" doesn't make sense.

.NET sockets ( stream socket -> tcp socket ) will not allow you to perform connection attempt on this address.

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot.com