network/routing(?) problems
 

I have three computers connected to a 100mbps switch. One
windows xp and two red hat linux servers.

Switch is connected to a ADSL-router which is capped at 512kbps.

Windows XP negotiates 100mbps link successfully and operates
at full bandwidth in both up- and downstreams.

Both linux servers negotiate 10mbps link. Downstream operate at
full bandwidth while the upstream (in both machines) is capped
to around 10 to 50 kilobytes per second.

My ADSL-router is: TeleWell TW-EA200 ADSL bridge & router
10/100MB Ethernet & USB

My switch is: D-Link DI-604 Ethernet Broadband Router

I would surely love to have my both linux boxes sending data to
my windows box at full 10mbps instead of ~500kbps. Could
this be a routing issue? If yes, where might be the routing table
failure? Both linux servers have identical routing tables
referencing the switch as default gateway.

Any help is appreciated since I have been trying to solve this
issue for quite a while now.

Thanks.

Which make/model of NIC are you using in the Linux machines?
Do lsmod and find the names of the networking modules loaded.
How are your eth~ interfaces configured? static, dhcp.
What does ifconfig show, MTU etc?

I am aware of some timing conflicts between different brands of NICs and hubs/switches which can slow traffic, but this is usually in both directions...

Because you don't get an automatic 100MBps connection, I would suspect the NIC drivers aren't working properly.
Have a look in /var/log/boot.log for NIC connection messages.