Ok, here is my situation: - I have a Lego Mindstorm that broadcast a UDP message every 10 seconds. - With Wireshark I can see the UDP message, so no problem with that. - I tried to set the option SO_BROADCAST, it does not work anymore.
Any other idea ? Jannik On Dec 19, 2013, at 4:14 PM, Stephan Eggermont <[email protected]> wrote: > Norbert wrote: > >To send or receive a broadcast packet you need to put special options on the > >socket on the native side (setsockopt). You need to >look if the > >SO_BROADCAST option is mentioned anywhere. If not it won’t work without > >adding them. And for sending them you >need almost special privileges on the > >system. This is not a „user feature“. > > And even though it is "the right thing" for lots of situations, your network > is also very likely to not do the right thing > with broadcast packets. Etsy decided on using bittorrent protocol to update > their production servers indexes, because they > found it too difficult to get their network to do the right thing. They found > that their switches were basically livelocked > while dealing with broadcast packets. > > http://codeascraft.com/2012/01/23/solr-bittorrent-index-replication/ > > If you want the broadcast to travel a little further, the routers need to be > configured not to drop the packets. > > Stephan
