c sendto function sets “network is unreachable” errno in linux2.6.29
Your code is fine. The problem is in your network administration.
You are missing a default route. The default route might be provided by your DHCP server, you might have to specify it in your network config files, or you might have to issue a command like route add default gw 192.0.2.1.
UDP broadcast breaks after some time on Linux 2.6.33.9 rt
Binding the socket to a device specific broadcast address, in my case 192.168.5.255, fixes the bug. I have no idea why this happens but it works.
IOException Network is unreachable
The network unreachable message is an ICMP message. When a host tries to reach another host on a different network, it sends the layer-3 packet to its configured gateway. If the gateway ( or any router in the path) doesn't know how to reach the other network, it will generate an ICMP message and send it back to the host.
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