USB-connection (ping) to 2.4.21 desktop

I'm working with Suse 8.2, Kernelupgrade to 2.4.21 (vanillia). 
I can't get a connection to Z, no ping possible. 

Plugging the USB-Plug of my 5500g into my desktop USB-slot, 
the PC beeps like normal. 

lsmod: 
usbnet                 14078   0  (unused)
CDCEther               12732   1 
acm                     6368   0  (unused)
usbserial              19836   0  (autoclean) (unused)


But setting up a ethernet device: 
ifconfig eth1 192.168.1.51 netmask 255.255.255.0 up

ifconfig eth1:
root@rex2:~>ifconfig eth1
eth1      Link encap:Ethernet  HWaddr 40:00:02:00:00:01  
          inet addr:192.168.1.51  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::4200:2ff:fe00:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:0 (0.0 b)  TX bytes:8451 (8.2 Kb)



But I can't ping to Z that is configured with 192.168.1.201!!
Why? 

/var/log/messages: 
[...]
Nov 29 14:45:44 rex2 kernel: hub.c: new USB device 00:07.2-1, assigned 
address 3
Nov 29 14:45:44 rex2 kernel: usb.c: USB device 3 (vend/prod 0x4dd/0x8004) 
is not claimed by any
active driver.
Nov 29 14:45:51 rex2 kernel: usb.c: registered new driver acm
Nov 29 14:45:51 rex2 kernel: acm.c: v0.21:USB Abstract Control Model 
driver for USB modems and ISDN
adapters
Nov 29 14:45:51 rex2 insmod: Using 
/lib/modules/2.4.21/kernel/drivers/usb/acm.o
Nov 29 14:45:51 rex2 insmod: Symbol version prefix ''
Nov 29 14:45:51 rex2 kernel: CDCEther.c: CDCEther.c: 0.98.6 7 Jan 2002 
Brad Hards and another
Nov 29 14:45:51 rex2 kernel: usb.c: registered new driver CDCEther
Nov 29 14:45:51 rex2 kernel: CDCEther.c: Found Header descriptor, CDC 
version 110.
Nov 29 14:45:51 rex2 kernel: CDCEther.c: Imperfect filtering support - 
need sw hashing
Nov 29 14:45:51 rex2 kernel: CDCEther.c: Can't use 
SetEthernetMulticastFilters request
Nov 29 14:45:51 rex2 kernel: CDCEther.c: detected BULK OUT packets of 
size 64
Nov 29 14:45:51 rex2 kernel: CDCEther.c: eth1: Sharp SL Series
Nov 29 14:45:51 rex2 kernel: CDCEther.c: eth1: 40:00:02:00:00:01
Nov 29 14:45:51 rex2 insmod: Using 
/lib/modules/2.4.21/kernel/drivers/usb/CDCEther.o
Nov 29 14:45:51 rex2 insmod: Symbol version prefix ''
Nov 29 14:45:51 rex2 kernel: usb.c: registered new driver usbnet
Nov 29 14:45:51 rex2 insmod: Using 
/lib/modules/2.4.21/kernel/drivers/usb/usbnet.o
Nov 29 14:45:51 rex2 insmod: Symbol version prefix ''
Nov 29 14:45:51 rex2 kernel: usb-uhci.c: ENXIO 80000380, flags 0, urb 
d0e1d740, burb d0e1d640
Nov 29 14:45:51 rex2 kernel: usbdevfs: USBDEVFS_CONTROL failed dev 3 rqt 
128 rq 6 len 9 ret -6 
Nov 29 14:45:51 rex2 /etc/hotplug/usb.agent[4113]: cannot get config 
descriptor 0, No such device or
address (6)
Nov 29 14:45:51 rex2 kernel: usb-uhci.c: ENXIO 80000380, flags 0, urb 
d0e1d740, burb d0e1d640
Nov 29 14:45:51 rex2 kernel: usbdevfs: USBDEVFS_CONTROL failed dev 3 rqt 
128 rq 6 len 18 ret -6
Nov 29 14:45:51 rex2 /etc/hotplug/usb.agent[4113]: cannot get config 
descriptor: No such device or address
Nov 29 14:45:51 rex2 kernel: usb-uhci.c: ENXIO 80000380, flags 0, urb 
d0e1d640, burb d0e1d740
Nov 29 14:45:51 rex2 last message repeated 2 times
Nov 29 14:45:51 rex2 /etc/hotplug/usb.agent[4144]: writing usb-1-3 to 
/var/run/hotplug/net
Nov 29 14:45:51 rex2 /etc/hotplug/usb.agent[4113]: writing usb-1-3 to 
/var/run/hotplug/net
Nov 29 14:45:52 rex2 /etc/hotplug/net.agent[4170]: Using HW description 
eth-usb-1-3   
Nov 29 14:45:52 rex2 ifup: No configuration found for eth-usb-1-3 eth1

thx
Ekkard