Go

Currently running this bitch on a server with 24 processors clocked at 2.6Ghz, 16GB of ram and fiber connection. Currently pinging about 300-400 IP addresses/second. And the glue holding this bitch together is Go. Look at that simple concurrency model and message passing, it's a thing of fucking beauty. Now to get this running on the other 4 servers just like it.

http://pastebin.com/rqEvpszX
Currently running at: 177 valid IPs/second, 582 IPs/second

And I know that the last part is a little hacky and that the IP functions should be moved to their own source file. Bite me.

Why aren't you using Go /prog/?

By the way, using a union as you suggest is also undefined behaviour. The contents of a field of a union become undefined after writing to another field.

>>37
You sure about that? I thought that the fields of a union had to occupy the same region of memory, which would be the size of the largest field (so a union { uint64_t u64; int32_t i32; }; would be 8 bytes).

>>37,41
I suppose that if the union was volatile it would be required to actually update the field, but there's still endianness, padding bits, and integer representations to worry about.