There's one interesting additional refinement in the lwn.net article that Steve linked. Here's the quote:
" TCP window scaling and broken routers Posted Dec 14, 2006 0:15 UTC (Thu) by pcharlan (guest, #29128) [Link] With kernel 2.6.17.13 or higher, you can also do: THEIR_IP=1.2.3.4 MY_GATEWAY=5.6.7.8 ip route add $THEIR_IP/32 via $MY_GATEWAY window 65535 which only limits window scaling for that destination without interfering with your other connections. " Haven't actually tried this fix myself since I don't currently have this problem although I have had it in the past. Looks like an even better solution to me if it works. Jim ----- Original Message ----- From: "Steve Scaffidi" <[email protected]> To: <[email protected]>; "Boston Perl Mongers" <[email protected]> Sent: 12/08/2009 10:58 PM Subject: Re: [Boston.pm] [Perladvent] mod_perlite... working! BTW, I think I've found a solution to my SSH sessions freezing at "random" It's discussed and explained in the thread here: http://bit.ly/5Kh2PE Summary: tcp window scaling* freaks out various types of old or stupid network equipment. To disable it on the offending system, issue the following command: sudo sysctl -w net.ipv4.tcp_window_scaling=0 I don't know exactly where the problem is occuring in my case, but issuing that sysctl on my laptop fixed the issue with ssh lagging to the systems behind the PIX at work... but ssh sessions to my linode server weren't fixed until I did it on that host as well. There's also an article on this issue here: http://lwn.net/Articles/92727/ * introduced in the linux kernel around 2004 but not turned on by default until around 2006 -- -- Steve Scaffidi <[email protected]> _______________________________________________ Boston-pm mailing list [email protected] http://mail.pm.org/mailman/listinfo/boston-pm _______________________________________________ Boston-pm mailing list [email protected] http://mail.pm.org/mailman/listinfo/boston-pm
