[oclug] 240.0.0.1 and 240.0.0.2

[Patrick Smith]

Dana Webber wrote:
> [root at dunrobin root]# hping2 -1 -c 1 -I eth1 240.0.0.2
> HPING 240.0.0.2 (eth1 240.0.0.2): icmp mode set, 28 headers + 0 data bytes
> [send_ip] sendto: Invalid argument
> 
> What is sendto?

It is a system call to send data over a socket.  "man sendto" should 
give you all the gory details.

Try running the command under strace; this might help you to understand 
what's going wrong.