Date: Sun, 09 Feb 1997 11:37:29 +0800 From: Peter Wemm <peter@spinner.DIALix.COM> To: Robert Chalmers <robert@nanguo.chalmers.com.au> Cc: freebsd-questions@freebsd.org (bsd), freebsd-isp@freebsd.org (FreeBSD ISP), bugs@freebsd.org Subject: Re: I give up! no ideas left. Message-ID: <199702090337.LAA05161@spinner.DIALix.COM> In-Reply-To: Your message of "Sun, 09 Feb 1997 09:09:47 %2B1000." <199702082309.JAA00202@nanguo.chalmers.com.au>
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Robert Chalmers wrote: > The saga of failing connections to my web site. Some do, some dont. > 2.1.5 will, 2.2 wont. Anything SUN based also seems to barf. I dont > know about the rest. Some connect and hang. 5000 a month on average > have no problems at all!!! Have you tried turning off the transaction tcp code? (see RFC1323 and RFC1644) In /etc/sysconfig: # # Some broken implementations can't handle the RFC 1323 and RFC 1644 # TCP options. If TCP connections randomly hang, try disabling this, # and bug the vendor of the losing equipment. # tcp_extensions=YES Changing YES to NO and rebooting is the permanent way. Or, you can do this at run time without a reboot to test it: sysctl -w net.inet.tcp.rfc1323=0 sysctl -w net.inet.tcp.rfc1644=0 Did you mention an Annex in the pathway? I understand they are known to cause problems with T/TCP headers. On http://www.noao.edu/~rstevens/ttcp.html I see: Implementations that Interact Poorly with T/TCP * Solaris, through and including 2.5. See Section 3.7 of TCP/IP Illustrated, Volume 3 for details. * AIX 4.1.2. Earlier versions, specifically 3.2.2, handled SYN/data/FIN segments correctly. * Annex terminal servers. These don't like SYN segments with FIN or data. This botch extends to their SLIP/PPP implementation (perhaps only when doing VJ compression), so that T/TCP across an Annex acting as a dialup SLIP server fails even if both ends are capable. * Linux. * KA9Q. This page is from the author of the TCP/IP Illustrated series, W. Richard Stevens. Cheers, -Peter
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