I have the following setup:

|------|                         |-----------|
|  NT  |192.168.1.2   192.168.1.1|   Linux   |
| 4.0  |-------------------------|  2.0.33   |
|------|                         |-----------|
                                 aaa.bbb.ccc.ddd
                                       |
                                       |
                                    MODEM 33.6(PPP0)
                                       |
                                       |
                                       |
                                       |
                                    INTERNET


NT 4.0 -> PPro 200/64MB NE2000
Linux -> i386/16/MB NE2000

I use Linux as a firewall for my WinNT box. 
The Linux Box is connected through a 33.6 modem to my ISP.
It runs ipmasquerading, DSN cache server.
When there is no load on the Linux box everything is fine.
I get a speed of 32kbit/sec and +/- 1% package drop.
But when the load gets high (new kernel build) the speed drops
to 4kbit/sec and 25% package drop.
I already use IRQTune to boost the serial IRQ.
I tried to 'nice' the kernel build, but no improvement.
Is there anyway I can improve the speed when the load gets high ?
Any suggestions are welcome !


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