Hi, first of all your output looks pretty good to me, but:

>** /etc/resolv.conf (it is a good nameserver for our network) :
>nameserver 193.48.100.6

add the lines:

nameserver 193.48.100.89
lookup file bind

to it, telling your host it knows it's own name
and that it can find it in the /etc/hosts file.
This done to be sure your hosts name and nr is at least known by itself.
Maybe you also have to fill in the /etc/myname (lpnm18) and /etc/mygate
(Paris2),
that way you don't have to "hardcode" these:

>route add lpnm18 localhost
>route add default Paris2

>** There is no routed running.

I think you need routed, isn't it?
Enable it in /etc/netstart:
routed_flags="-q"

That then should result in something like:
Routing tables

Internet:
Destination      Gateway            Flags     Refs     Use  Interface
default          Paris2             UG          0       22  ae0
localhost        localhost          UH          0        5  lo0
193.48.100       link#1             UC          0        0  ae0
Paris2           link#1             UHRL        1        0  ae0
193.48.100.6     link#1             UHRL        0       24  ae0
193.48.100.40    link#1             UHRL        3       48  ae0
lpnm18           localhost          UHL         6      304  lo0

XNS:
Destination      Gateway            Flags     Refs     Use  Interface

Wich is a different flavore of your's.
Let me hear the results,
~n