cups "no route to host"

[yvon]

with my setup i have two printers ::

one epson stylus color 500 attached to the printer port (ttyS1)
the other an Apple Laser Writter IIg attached to the eth0 port.

none of those are working (althought they are working over macOS 9.1)

I'm sure that ttyS1 is working because i'm using it for pilot sync ( i
have a manual external switch to commute printer/Pilot) but CUPS seems
to be printing, for example, right now i have the following message from
CUPS :

"Printing page 1, 67% complete..." 

but nothing happens to the printer side...

for the ethernet printer i do have an error message :

"Unable to connect to printer (retrying in 30 seconds): No route to
host" 

here is the URI i gave to this printer (under CUPS) :
Device URI: socket://192.168.0.254:9100/

and here my routing table :[root@localhost proc]# route -F
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
192.168.0.0     *               255.255.255.0   U     0      0        0
eth0
127.0.0.0       *               255.0.0.0       U     0      0        0
lo

if i have a look into /proc/ i don't see anything about those
printers...

obviously they haven't been recognised at install then how could i make
the software recognizes those printer, for me, it looks like a missing
link between CUPS (ie software) and the printers (hardware).



-- 
Yvon Thoraval