On 2017年11月16日 22:06, Ed Swierk wrote:
The checksum algorithm used by IPv4, TCP and UDP allows a zero value
to be represented by either 0x and 0x. But per RFC 768, a zero
UDP checksum must be transmitted as 0x because 0x is a special
value meaning no checksum.
Substitute
The checksum algorithm used by IPv4, TCP and UDP allows a zero value
to be represented by either 0x and 0x. But per RFC 768, a zero
UDP checksum must be transmitted as 0x because 0x is a special
value meaning no checksum.
Substitute 0x whenever a checksum is computed as zero
