C: If source IP header change, TCP header checksum also change
Question
是否有部分/增量方法来获取新的TCP校验和而不重新计算所有内容？
1 answers
solution1
1 2014-01-20 09:52:54
Yes.
Just google "Incremental TCP checksum" and you'll find lots of data.
The basic idea is to add the difference between the old and new IPs to the old checksum.
But the arithmetic should be 1's complement, which complicates things a bit.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
IP and TCP header checksum calculate in c
TCP Header and Checksum
C - TCP Checksum (using raw sockets) — how to source IP address
ICMP header and IP header checksum calculations
RFC 1071 - Calculating IP header checksum confusion in C
The organization of TCP/IP header files
How to build a TCP pseudo header and related data for checksum verification in C and libpcap?
How to change the flags in the tcp header of a packet in NS-2?
Create IP Header in C
How does the UDP checksum change for IP fragments?
Related Tags