Compute CRC cheksum used in IP protocol
Version Compatibility: Visual Basic 6
To use it with a IP header, replace the CRC value with zeros, calculate the ckecksum, then replace it in the header. If everything's OK, you should have a CRC of 0 or FFFF when calculating it on the complete IP header (with checksum OK).
Instructions: Copy the declarations and code below and paste directly into your VB project.