broadcast a udp to "255.255.255.255" ?

[wxuf]

hi,
What does this mean ? of course there is a port such as 61450.

I am a little confused with the SOCK_DGRAM.
Should the server and client create the same type socket ?

When I broadcast a udp to "255.255.255.255", what would
happen ?

Please help to explain

wxuf

[Andreas Masur]

[Moved thread]

[wxuf]

Originally posted by Andreas Masur
[Moved thread]


?? can you explain more details ?

Thank you

wxuf

[mamut]

sendto 255.255.255.255:
If the socket option SO_BROADCAST is not set, nothing happens.
If sendflag = MSG_DONTROUTE, all host in your LAN segment can receive your message.
If sendflag = 0, your gateway router(s) will make decision of broadcasting the message to other network segments.

[Andreas Masur]

Originally posted by wxuf
?? can you explain more details ?

I simply moved your question to the appropriate forum... :cool:

[wxuf]

en, I see something now..

just as mamut says, i will set the SO_BROADCAST by setsockopt()
in my project. And the aim of my project is to get all the ips in the
LAN, after I broadcast a udp to "255.255.255.255", is that
possible that other pcs send back a udp to me ? sorry, it may
sounds naive..

wxuf