A dumb newbies network configuration question

Hello,

i'm a newbie in network configuration, so i need help for the following
problem.

I have a good working network. 3 iMac/Intel/AMD PC's and an Ultra10,
all on a hub with
IP 10.0.0.1, 10.0.0.2, 10.0.0.3 and 10.0.0.4

But the U10 machine (bought on EBay) has 3 additional PCI Ethernet
cards. So i want to
replace the hub and connect the 3 others with a cross over cable to the
U10 ports.

As far a i understood i have to setup three subnets 192.168.1.X,
192.168.2.X and
192.168.3.X and declare the Ultra10 as the router ? Correct ? A good
idea ? And a simplest
way to get what i want ?

I tried the following after reading parts of the System Administrator
Guide, Volumne 3, i

a) created an empty /etc/gateway file.
b) added the following lines to /etc/inet/netmasks
192.168.1.0 255.255.255.0
192.168.2.0 255.255.255.0
192.168.3.0 255.255.255.0
c) added the following lines to /etc/inet/hosts
192.168.1.10 u10-to-amd
192.168.2.10 u10-to-intel
192.168.3.10 u10-to-mac
192.168.1.1 my-amd-box
192.168.2.1 my-intel-box
192.168.3.1 my-imac-box
d) defined the adapters with the files
/etc/hostname.hme0 contains "u10-to-amd"
/etc/hostname.hme1 contains "u10-to-intel"
/etc/hostname.hme3 contains "u10-to-mac"
e) configured the ethernet adapter on the amd with ip 192.168.1.1
the adapter on the intel with 192.168.2.1
the adapter on the mac with 192.168.3.1

rebooted all machines, and after this the network does absolutely not
work

.

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