On Fri, 25 Nov 2011 08:59:40 +0100 +debianuser+thegrue+733a2fc4c3.debianuser.thegrue#spamgourmet....@spamgourmet.com wrote:
> Hello, > > > We have a few linux machines behind a firewall. When we start a > > download on the "newer" machines (kernel 2.6.32-5), the download > > starts fast (~3M/s), then quickly gets slower after about 10 or 20 > > seconds and soon stalls completely or proceeds at ~3 Byte/s or > > something like that. > > Now that I know the name of the firewall (it's a Sonicwall NSA3500), > I found a very interesting thread: > > > http://shadowknight.real-time.com/pipermail/tclug-list/2009-October/056617.html > The name of the firewall did really help. The solution is to either get a firewall that can handle RFC1323 or to disable window scaling on the clients: sysctl -w net.ipv4.tcp_window_scaling=0 I got the solution from these articles: http://serverfault.com/questions/117319/linux-servers-seeing-bad-download-performance-behind-sonicwall-firewall http://prowiki.isc.upenn.edu/wiki/TCP_tuning_for_broken_firewalls Thanks for your help, -- Markus Grunwald -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20111125101409.12e67...@pc-cm-gru-virtlinux1.pt.local
