Thanks to all who took the time to help!
And the winner is: ..... ME!
Not because I found the solution but because I learned a lot, one of my 
computer problems was solved and I experienced the helpful spirit of 
the Mandrake and Linux community.

Details:

I put all devices into the same subnet, following Bill Mullens advice:

** Bill Mullen (Samstag, 21. Juni 2003 07:59)
> > ** Bill Mullen (Samstag, 21. Juni 2003 06:25)
> >
> > > I'd recommend putting them on the same subnet, using "Proxy ARP
> > > with Subnetting". See the HOWTO at:
> > >
> > > http://www.linux.org/docs/ldp/howto/mini/Proxy-ARP-Subnet/index.h
> > >tml
> > >
> > > To do this, you need to adjust the netmask of the usb0 interface,
> > > so that the range it covers is a *subset* of the range that eth0
> > > uses, like so:
> > >
> > > Int.      Network         Netmask         Broadcast
> > >
> > > eth0      192.168.0.0     255.255.255.0   192.168.0.255
> > > usb0      192.168.0.128   255.255.255.128 192.168.0.255
> > >
> > > The IP of usb0 should be 192.168.0.129, and the PDA's can be
> > > anything from 192.168.0.130 to 192.168.0.254.
> > >
> > > In /etc/sysctl.conf, you'll probably need:
> > >
> > > net.ipv4.ip_forward = 1
> > > net.ipv4.conf.default.rp_filter = 0
> > > net.ipv4.conf.all.proxy_arp = 1
> > >
> > > And in /etc/sysconfig/network:
> > >
> > > FORWARD_IPV4=true
> >

That was done.
Now I had:

# /sbin/arp
 Address          HWtype  HWaddress           Flags Mask   Iface
 192.168.0.1      ether   xx:xx:xx:xx:xx:xx   C            eth0
 192.168.0.200    ether   xx:xx:xx:xx:xx:xx   C            usb0
 (HWaddresses anonymised)

 route on desktop:
 -----------------
Destination    Router       Genmask         Flags Metric Ref  Use Iface 
192.168.0.128  *            255.255.255.128 U     0      0    0   usb0 
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 
default        192.168.0.1  0.0.0.0         UG    0      0    0   eth0

route on PDA:
---------------
Destination    Router       Genmask         Flags Metric Ref  Use Iface 
192.168.0.0    *            255.255.255.0   U     0      0    0   usbf 
127.0.0.0      *            255.0.0.0       U     0      0    0   lo 
default        192.168.0.129  0.0.0.0       UG    0      0    0   usbf

Bill Mullen continued:

> All I can think of is that the PDA's netmask should be
> 255.255.255.128, and the PDA's network should read 192.168.0.128
> (matching usb0) ...

I changed that in the PDA's /etc/sysconfig/network-scripts/ifcfg-usbf 
and then added 192.168.0.129 as default gateway again.

That was it! Only had to add 192.168.0.1 as nameserver into PDA's 
/etc/resolv.conf and Like A Bat Out Of Hell I'll be Gone into the 
internet!

Thanks to all, also to those whose advice I did not follow. Your advice 
is saved for future reference.

wobo
-- 
Public GnuPG key available at http://www.wolf-b.de/misc



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