Nping: Support for sending specific invalid checksum

[cyberixae]

Having support for random bad checksum is a nice feature. However, today I encountered a situation where I needed to set IP header checksum to 0x0000 to find out whether or not the server would accept a zero checksum. It would be nice if there was a command line flag for populating the checksum field with an arbitrary value.

[nnposter]

If you need a quick hack and can compile Nping then you can just edit

nmap/nping/ProbeMode.cc

Line 619 in e2f1df9

i->setSumRandom();

changing it to i->setSum(0);