Firewire network

Hello !
I want to connect 2 imac G5 to one external firewire hard drive (maxtor 20 Go)
I found at unibrain.com the software called "Firenet" which is supposed able to create a network through firewire ports
is anyone try it ?
I want to connect the 2 imac with a firewire cable and with the external HD connected to imac n°1.
with ethernet connection : when I want to make transferts from the imac n°2, imac n°1 speed down. is this fall of speed is solved by using the firewire ports ?
p.s. excuse for my perharps approximative english !
thanks
2x imac G5 - 1,8 Mhz - 1,25 Go - HD 80 GB Mac OS X (10.3.9)

thanks for you help
the 2 macs are connected through ethernet network
see below
actual connections
HD<-firewire cable->mac n°1 <-ethernet network->mac n°2
expected connections
HD<-firewire cable->mac n°1 <-ethernet network->mac n°2
!______firewire___________¡
when I make huge transferts via ethernet network, mac n°1 slow down dramatically
is the 2nd configuration can improved transferts ?

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