Starting last night I was unable to access Gmane via either NNTP or HTTP. The TCP handshake succeeds, but nothing further happens. After a great deal of troubleshooting (including about an hour on the phone with my ISP this evening), I finally determined that the problem is with a sysctl setting that changed somewhere between the 2.6.7 and 2.6.8.1 vanilla kernels.
The problem sysctl is net/ipv4/tcp_default_win_scale. On vanilla 2.6.7, this defaults to 0. On vanilla 2.6.8.1, this defaults to 7. With it set to anything higher than 4, I have problems with Gmane. The kernel itself is not to blame, as I had no problems accessing Gmane from this system before last night - it's probably an issue similar to that sometimes seen with ECN turned on. I don't know if this has been reported before (though I haven't seen anything on this list), but I wanted to let people running recent 2.6 kernels know that, if they experience odd TCP networking issues (successful handshake, but no data transfer), they should check this setting. Adam -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
