On Thu, Jun 27, 2002 at 10:57:42AM +1200, Juha Saarinen wrote:
Having once again fallen into the ECN-enabled-on-new-kernel-breaks-everything-trap, I was wondering if:
a) ECN is actually useful;
Yes, it is. You get a lot of resends at high link utilisation using RED, and if you use RED+ECN then you can limit the resends, and have higher effective link utilisation.
b) Eventually, everyone will upgrade their routers;
I doubt it :) Some equipment still fails on the rfc1323 extensions. (large window scaling etc; the high performance extensions) I hope that everyone that *matters* fixes the problem in the next few years though.
c) There's a way to automagically fall back to non-ECN TCP, if you see what I mean, instead of having to manually disable/enable it each time.
There's a proposal where if you receive a RST after sending a SYN packet with ECN enabled you send another SYN packet without ECN enabled for that connection. This should alleviate the issues. I seem to recall at least one of the BSDs using this method; which one has ECN patches? Ben. - To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog