[Ns-developers] Checksums (UDP) in ns3

[Manuel Requena]

Hi, 

> 
> Unfortunately, I can't find similar words in the TCP RFC about
> the TCP checksum.  Will continue to research this from the standpoint
> of TCP.
> 

Apart from the basic ones, there are other interesting RFCs for this kind of issues:

- RFC-1122 Requirements for Internet Hosts - Communication Layers. R.
     Braden, Ed.. October 1989. (Format: TXT=295992 bytes) (Updated by
     RFC1349, RFC4379) (Also STD0003) (Status: STANDARD)

- RFC-1812 Requirements for IP Version 4 Routers. F. Baker, Ed.. June 1995.
     (Format: TXT=415740 bytes) (Obsoletes RFC1716, RFC1009) (Updated by
     RFC2644) (Status: PROPOSED STANDARD)


About TCP checksum, the RFC-1122 says:

"
4.2.2.7  TCP Checksum: RFC-793 Section 3.1

            Unlike the UDP checksum (see Section 4.1.3.4), the TCP
            checksum is never optional.  The sender MUST generate it and
            the receiver MUST check it.
"

Best regards,
Manuel