[e2e] Mixed ECN and Non-ECN traffic flows.

Simon Leinen simon at limmat.switch.ch
Mon Oct 21 01:34:50 PDT 2002

On Tue, 15 Oct 2002 16:17:18 -0500 (CDT), Kacheong Poon <poon at cs.wisc.edu> said:
> Included message from Kostas Pentikousis <kostas at cs.sunysb.edu>:
>> ----
>> Unfortunately, I have no references on Solaris support for ECN. Any
>> pointers will be appreciated.
>> ----

> Do a `man tcp` on a Solaris 9 system and you can find some info.
> And I believe you can also find some info in the Solaris tuning
> guide.  I am not sure about the guide's URL, but you should be able
> to find it in http://docs.sun.com/

Yes, but once you have found the document 


and managed to activate ECN on your host (ndd -set /dev/tcp
tcp_ecn_permitted 2), you may no longer be able to access
http://docs.sun.com/ .  At least from here there [] seems to
be something on the path to docs.sun.com that blackholes TCP SYN
packets with the ECN flag.

(ftp.cisco.com used to have the same problem but that was fixed.)

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