Networking problem MacOS8.6-Suse Linux

Hi guys I really need an advice since I am getting crazy with all
networking stuff..
I want to bild up a little home networking from my Suse Linux PC and My
PowerBook G3 Mac OS 8.6.
The PC is the server has an eth0 card connected via cross over cable to
the mac and a dsl1 card connected to internet.
I have installed Netatalk in the PC and everything works fine (at least
the hardware), I can see the PC hard drive on my mac.
I use mac ping and I can ping the PC ONLY if the Netatalk is running.
The problem is:
I can`t ping the eth0 card if I enter eth0 IP adrs 192.168.99.1.
I think that Aplle talk is working but not the TCP/IP. What do I need
to configure my mac? MacTCP/IP is enough or I need something else?. I
never had problems when I connected in the office my mac to a LAN:

Paolo

Here is the route and ifconfig of the linux machine:

bigdell:/home/paolo # ifconfig
dsl1 Link encap:Point-to-Point Protocol
inet addr:84.150.14.164 P-t-P:217.0.116.84
Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:657 errors:0 dropped:0 overruns:0 frame:0
TX packets:732 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:484827 (473.4 Kb) TX bytes:108824 (106.2 Kb)

eth0 Link encap:Ethernet HWaddr 00:80:AD:78:5A:29
inet addr:192.168.99.1 Bcast:192.168.99.255
Mask:255.255.255.0
inet6 addr: fe80::280:adff:fe78:5a29/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7529 errors:0 dropped:0 overruns:0 frame:0
TX packets:7555 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:452102 (441.5 Kb) TX bytes:325408 (317.7 Kb)
Interrupt:3 Base address:0xec00

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:47 errors:0 dropped:0 overruns:0 frame:0
TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2676 (2.6 Kb) TX bytes:2676 (2.6 Kb)

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
217.0.116.84 * 255.255.255.255 UH 0 0 0
dsl1
192.168.99.0 * 255.255.255.0 U 0 0 0
eth0
loopback * 255.0.0.0 U 0 0 0
lo
default 217.0.116.84 0.0.0.0 UG 0 0 0
dsl1