On Wed, Oct 17, 2001 at 11:17:54PM -0500, Jeffrey Forman wrote: : : BINGO! The mailing list does help. Thank you so much for your help. : : Anyone able to explain to me what this ECN crap is and what is has to do : with not leting me telnet to anything on mail.utexas.edu?
Well, I'd started to write my own response, and then I went to look up the sysctl to enable and disable ECN in Linux. So here's the /usr/src/linux/Documentation/Configure.help entry for ECN. CONFIG_INET_ECN Explicit Congestion Notification (ECN) allows routers to notify clients about network congestion, resulting in fewer dropped packets and increased network performance. This option adds ECN support to the Linux kernel, as well as a sysctl (/proc/sys/net/ipv4/tcp_ecn) which allows ECN support to be disabled at runtime. Note that, on the Internet, there are many broken firewalls which refuse connections from ECN-enabled machines, and it may be a while before these firewalls are fixed. Until then, to access a site behind such a firewall (some of which are major sites, at the time of this writing) you will have to disable this option, either by saying N now or by using the sysctl. If in doubt, say N. :) Jonathan --------------------------------------------------------------------------- Send administrative requests to [EMAIL PROTECTED]
