Hi,
I've the following Setup
PC1
Linux PC kernel 2.4.21,
PCI Network card with realtek 8029
PC2
Windows 2k ( Terminal Server )
PCI Network card with realtek 8029
PCI Network card with realtek 8139
PC3
Windows 2k Terminal Server
PCI Network card with realtek 8139
Scenario 1:
PC1 and PC2 are connected via BNC and i use rdesktop to connect to the
terminal server, no problem
-------- --------
| PC 1 | | PC 2 |
|------| |------|
|-------------BNC--------------------|
Scenario 2:
PC2 gets a second Ethernet card rtl8139, routing is activated
PC3 is connected to PC2 via 100BaseT
-------- --------
| PC 1 | | PC 2 |-----100BaseT
|------| |------| |
|-------------BNC--------------------| |
|
--------
| PC 3 |
|------|
i connect to PC3 with rdesktop no problem
Scenario 3:
The BNC Network gets a 3Com 8 Port Hub with one BNC
-------- --------
| PC 1 | | PC 2 |
|------| |------|
|-------------BNC-----|--------------|
|
----- --------
|HUB| -----10BaseT-----| PC 3 |
----- |------|
PC1 connects to PC3 with rdesktop with collision rate around 30% with
network utilization 30KB/s (70pkts/s)
But if
PC2 connects to PC3 with mstsc I get the same network utilization but NO
collision
It looks like, that the Linux Networking stack is faster but produces
more collisions, I've looked at the throughput with iptraf and it was
perfect, even if i added more PCs making some traffic with tcpspray.
The problem is that customers don't accept the high collision rate.
I tried to change nearly all components:
Different Motherboards, different NICs (3Com), different HUB, different
Kernel (2.4.18, 2.2.20, 2.2.12), different cables :), different
T-Connectors, different Resistors
Tuning the software:
Limiting incoming traffic with iptables, limiting incoming traffic with
ingress scheduling,
Any Ideas ?
-GES
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LISCON GmbH http://www.liscon.com/
Gerhard Schaden ges@liscon.com
Leitung Forschung u. Entwicklung
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N:Schaden;Gerhard
FN:Gerhard Schaden (E-Mail)
ORG:Liscon GmbH
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