[nas-2000] Re: AW: Slow ftp bin transfer problem
- From: "Alfred Bruckner" <alf_0001@xxxxxxxxxx>
- To: <nas-2000@xxxxxxxxxxxxx>
- Date: Thu, 27 Mar 2008 10:28:42 +0100
Hi,
there seems to be a solution for our problem!
Thank you Sven and stonki!!
You have to add in your proftpd.conf at /system/hddapp/etc/
UseSendfile off
Additional description can be found at:
http://www.proftpd.org/docs/directives/linked/config_ref_UseSendfile.html
Eventually you may add (although it is untested)
AllowStoreRestart on
AllowRetrieveRestart on
Note:
for latest tinky firmware the changes remain after reboot
for Raidsonic firmware changes are lost after reboot
you could edit and stop/start proftpd
/usr/hddapp/etc/proftpd.conf
/usr/hddapp/etc/rc.d/S91proftpd.sh stop
/usr/hddapp/etc/rc.d/S91proftpd.sh start
HWguru
> -----Original Message-----
> From: nas-2000-bounce@xxxxxxxxxxxxx [mailto:nas-2000-bounce@xxxxxxxxxxxxx]
> On Behalf Of Tuchscheerer, Sven (K-EFFI/P)
> Sent: Wednesday, February 27, 2008 5:35 PM
> To: nas-2000@xxxxxxxxxxxxx
> Subject: [nas-2000] AW: Slow ftp bin transfer problem
>
>
>
> Hi Alfred,
>
> did someone forward the Problems written above to the proftpd "Engeneers"?
> As I know this pretty lightweight server is open source. Therefor I guess
> there´s @least a moderate Group who can give some input to problem (not
> the solution - this might be like christmas ;-))
>
> greetz. Sven
>
> -----Ursprüngliche Nachricht-----
> Von: nas-2000-bounce@xxxxxxxxxxxxx [mailto:nas-2000-bounce@xxxxxxxxxxxxx]
> Im Auftrag von Alfred Bruckner
> Gesendet: Mittwoch, 27. Februar 2008 15:08
> An: nas-2000@xxxxxxxxxxxxx
> Betreff: [nas-2000] Slow ftp bin transfer problem
>
> Hello,
> we are trying to find a solution for the "slow ftp bin transfer problem"
>
> There is also a German post at the nas2000 forum:
> http://nas2000.homeunix.com/thread.php?postid=464#post464
>
> Many users have the problem that ftp download through an internet
> connection
> from the NAS may be very slow.
>
> Test setup:
> PC - Internet - ADSL modem - Router - Switch - NAS
> Port forwarding (20,21) is configured for modem and router.
> I traced the packets sent/received from NAS (connected sniffer with HUB
> between Switch and NAS)
>
> What I know already:
> - ascii mode transfer is fast, bin mode may be slow
> - on local net ftp is fast
> - it is caused from too large packets sent from the nas
> NAS always use packet size like if MTU=1500
> e.g. NAS sends two large and one small packet - the two large ones are
> rejected with "fragmentation needed" and the smaller one passes
> --> retransmission...
> - MTU setting of ifconfig is ignored by ftp in bin mode
> In ascii mode packet size is reduced accordingly
> - MSS setting of route command is ignored
> - MSS setting with SocketOptions in proftpd.conf is ignored
> - most PPPoE connections need a setting of MTU=1492 because of 8 bytes
> overhead. That corresponds to MSS=1452.
> - same behaviour for Tinky and RS Firmware
>
> What I don't know:
> - how to tell proftp or the NAS to reduce the packet size as if MTU=1492
>
> Any ideas?
>
> HWguru (Alfred)
>
>
>
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