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Old 10-21-2004, 01:57 AM   #1
SotY
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Question slower download in passive mode

Hi

I think that I have found a bug in FlashFXP 3.0 (build 1022 but I tried some older versions and it was the same) when you are using passive mode to download files. I got 3Mbits dsl link and when I download files from fast 100Mbits server in passive I can't get speed faster than ~200 KB/s and when I switch to active I can get 300-320 KB/s from same server. I don't have this kind of problem when I try to use some other ftp client (CuteFTP, Total Commander or windows ftp command). I have to use passive mode for some reasons so maybe there is some way to fix that and I could still use flasfxp ?

Some results in FlashFXP

Active mode:
Transferred: test.rar 4,108,434 bytes in 13.55 seconds (296.1 KB/s)

Passive mode:
Transferred: test.rar 4,108,434 bytes in 21.21 seconds (189.2 KB/s)
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Old 10-21-2004, 07:37 AM   #2
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At first i thought this was nonsense but i tried myself a couple of times and you're right! With some servers i get a difference of 100%. Never realized this and i surely think this is something that need to be looked at.
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Old 10-21-2004, 01:40 PM   #3
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Can also confirm this, pretty strange. But i thank you on the same time. Now i can download faster
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Old 10-21-2004, 02:12 PM   #4
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I looked into this with Hetfield and I came up empty. I was not able to reproduce the same results he was. I reviewed the source code and I was unable to find anything that could explain this behavior. This is quite unusual.
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Old 10-21-2004, 02:49 PM   #5
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i gave this a quick test and same result as bigstar, i dont have time today to try more but i will tomorrow
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Old 10-22-2004, 07:46 AM   #6
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I haven't been able 2 reproduce it either......this is how it looked more or less all the time when i did about 10 d/l tests......


PASV Mode :
Transferred: test.rar 47,68 MB in 1 minutes 17 seconds (629,5 KB/s)


PORT Mode :
Transferred: test.rar 47,68 MB in 1 minutes 16 seconds (635,9 KB/s
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Old 10-24-2004, 11:35 PM   #7
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I don't know, maybe it has such bug on my dsl modem only (SpeedStream 5100 with built in router) but all other ftp clients work fine with max speed in passive and active modes so it's something wrong with FlashFXP for sure.

Here is my pc specs

FlashFXP v3.0, build 1022, [X]unregistered
OS [X] WinXP
Running behind NAT/router [X] Yes & Model [SpeedStream 5100 - public IP address for LAN device]
Running firewall [X] Yes, Name [Kerio Personal Firewall], Ver. [4.1.0] - no change when it's turned off
Running Antivirus [X] Yes, Name [NOD32 2.12.2] - no change when it's turned off
Network [X] xDSL
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Old 10-25-2004, 07:06 AM   #8
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I have a SpeedStream 5100 dsl modem too, however passive mode isn't any slower. It must be something else.
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Old 10-29-2004, 10:34 AM   #9
Joker
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I tried BPftp client, and rush ftp and they all have the same thing incommon with flashfxp. so it doesnt seem to be a flashfxp specific problem?

As further test i tried to connect to dc in active mode and in passive.
When i use active i get faster downloads also.

Maybe there are some limitations somewhere?
atleast for users with adsl/vdsl
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Old 10-29-2004, 10:16 PM   #10
MxxCon
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Quote:
I tried BPftp client, and rush ftp and they all have the same thing incommon with flashfxp. so it doesnt seem to be a flashfxp specific problem?
sounds more like server implemenation?
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Old 10-30-2004, 11:33 AM   #11
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its a flashfxp problem, i went back to an older version of flashfxp i found on google in the 2.x, this caused speeds to go from 196-208 kb/sec (passive in 3.x) to 600-900 kb/sec in passive 2.x. There is a bug somewhere that is doing this.
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Old 10-30-2004, 12:20 PM   #12
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So far we have not been able to find any evidence that this is a bug in v3.0. The majority of the code in question is identical to v2.x and most the differences have been ruled out as being buggy.

Apart from Sending PASV or PORT and opening or listening for a connection; the rest of the transfer routine shares the same code.

This is quite an unusual problem that is currently still under investigation.
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Old 01-03-2005, 09:23 PM   #13
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i believe i also have this or a similar problem, however it only
seems to be with a few sites, i have done a lot of testing between the current and a old version i have installed. One ftp i tested approx 5 times with each client i got the following results

3.02.1045 i can only do 90k sec max
2.1.923 i can do 150-180k sec
bpftp 150-180k sec

this server is running ProFTPD 1.2.10 Server


i tested 3 other ftps, however the speeds were fairly close between the 2 versions, generally 2.1 seems a bit faster


* FlashFXP v3.02.1045 & 2.1.923 [X]registered
* OS [X] WinXP SP2
* Running behind NAT/router [X] Yes & Model [Nokia M11]
* Running firewall [X] No
* Running Antivirus [X] No
* Network [X] xDSL
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Old 01-04-2005, 01:22 PM   #14
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hello all

Ok, i have exactly the same prob with v3

in some sites when i connecting with passive mode, my bandwith is limited... in one FTP for example i dl at 1 950ko/s , and with passive mode only 1 080ko/s !! ), same for upload ! , and the prob, is the passive mode is required to connect the site... : /
it's really a prob... (curious i tryed with v2 of flashfxp and upload is more limited but not the download....)
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Old 01-04-2005, 01:54 PM   #15
bigstar
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mastyman In FlashFXP v3.0.2.1045 Go into the Preferences / Advanced Tab / TCP/IP Buffer Size and increase/decrease the Receive buffer size and see if it helps your speed any.
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