Bug 243231

Summary:	TCP/ECN - RFC3168 specifies retransmissions not to be marked ECT in the IP header
Product:	Base System	Reporter:	Richard Scheffenegger <rscheff>
Component:	kern	Assignee:	Michael Tuexen <tuexen>
Status:	Closed FIXED
Severity:	Affects Some People	CC:	net, rgrimes, rscheff, tuexen
Priority:	---	Keywords:	needs-qa, standards
Version:	CURRENT
Hardware:	Any
OS:	Any
URL:	https://reviews.freebsd.org/D23118

Description Richard Scheffenegger freebsd_committer

2020-01-09 22:08:05 UTC

While investigating the interaction between ECN and RTO, I noticed that FBSD sends out retransmissions on ECN-enabled flows with the ECT0 codepoint in the
IP header - which is only permissible with ECN++ (work in progress as IETF draft).

This is not a critical deviation from the specs, only a lack of conformance.

Comment 1 Richard Scheffenegger freebsd_committer

2020-01-20 23:07:53 UTC

https://reviews.freebsd.org/D23118 

Please review and comment

Comment 2 Michael Tuexen freebsd_committer

2020-01-25 15:22:10 UTC

Fixed in base r357115.