Fast downloads are interrupded/dropped

[der_mensch]

Hello everybody,

I have 10 mbit cable channel and have following problem:
fast downloads of big files (e.g. CD image or Eclipse distribution) are interrupted and don't run after that.

There is no problem with slow downloads ( < 200 Kbps ).
The modem /signal values are ok. I have also already tried to connect my notebook without router and to disable firewall/antivirus SW.

Here are TCPAnalyzer results. I hope you guys will be able to help me. Thanks in advance.

« SpeedGuide.net TCP Analyzer Results »
Tested on: 05.28.2007 18:24
IP address: 82.212.x.xx

TCP options string: 020405b40103030301010402
MSS: 1460
MTU: 1500
TCP Window: 513920 (multiple of MSS)
RWIN Scaling: 3
Unscaled RWIN : 64240
Reccomended RWINs: 64240, 128480, 256960, 513920
BDP limit (200ms): 20557kbps (2570KBytes/s)
BDP limit (500ms): 8223kbps (1028KBytes/s)
MTU Discovery: ON
TTL: 40
Timestamps: OFF
SACKs: ON
IP ToS: 00000011 (3)
Precedence: 000 (routine)
Delay: 0 (normal delay)
Throughput: 0 (normal throughput)
Reliability: 0 (normal reliability)
Cost: 1 (low cost)
Check bit: 1 (incorrect)
DiffServ: CS0 000000 (0) - class 0, default traffic (RFC 2474).

[roleo]

Try using a download manager to split large files and also to allow resuming the download. The following works well and is free!
http://www.freedownloadmanager.org/

[trogers]

Make sure your comp is clear of spyware/malware.

Try the following with TCP Optimizer:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU 1500
TTL - 64
TCP Receive Window - 256960
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - checked
Timestamps - uncheck

Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 1
Host Priority - 1
DNSPriority - 1
NetbtPriority - 1
Lan Browsing speedup - optimized
QoS: NonBestEffortLimit - 0
ToS: DisableUserTOSSetting - 0
ToS: DefaultTOSValue - 80
MaxNegativeCacheTtl - 0
NetFailureCacheTime - 0
NegativeSOACache Time - 0
LAN Request Buffer Size - 32768
Then select "Apply Changes" and reboot to take effect