Keropi: just pluck an rtl8139D out of the trash somewhere, install it in your grexx, and set up devs:networks/rtl_8139.device to run at 100M full duplex. with a cat5 crossover cable to a peesea you should be able to get 1.5MB/sec easily. The peesea needs to be locked at 100M-FD, too. Same with switches, hubs in between.