[DEBUG] Emit warning message when compile

With most recent GCC library, it emits warning message since the
buffer is smaller than its length. It also seems make runtime
error of __fortify_err.

Both haven't happened before, it occurred after I use Ubuntu
13.10.
Merge pull request #7 from kyuhojeong/debug

[DEBUG] Emit warning message when compile
Enable multicast and broadcasting
Merge pull request #9 from ptony82/fix/enable-multicast

Enable multicast and broadcasting
Fix for properly responding to ARP
Merge pull request #10 from ptony82/fix/windows_arp

Fix for properly responding to ARP