On Wed, Jun 26, 2002 at 09:28:20PM -0700, Chris Wedgwood wrote:
On Thu, Jun 27, 2002 at 03:18:28PM +1200, Ben Aitchison wrote:
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.
In my experience *these* days, most ECN incompatible firewalls seem to drop the packet silently, so this doesn't work.
Earlier on, of the popular firewalls, the cisco PIX did send back RST when running oldish firmware, but it seems most people inflicted with these have since upgraded.
If the problem is usually on end-point firewalls, it may be pratical to remember if a host works with ECN or not, and to use some kind of timeout system; but that'd give an annoying delay if ECN wasn't enabled, and when you don't know the RTT how do you guess how long to wait? Actually if ECN was enabled just to parent smarthosting mail servers, and explicit proxy servers (both forward and reverse) then a large percentage of gain should be had. Ben. - To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog