Which server are you using? If you are using my v0.9.2 server or the original v0.9.0 server, you should either go back to using v0.8.6 and it's client or connect your PS2 directly to your PC with a crossover cable to reduce the amount of non-PS2 chatter on your network.
Originally Posted by SilentCryPSX
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit