connecting vmware through tinc on host system (linux)

[Till Wimmer]

Hello,

i'm using a debian etch box (2.6.18-5-686) with tinc 1.0.5 for 
connecting to my office LAN.

On the same box there's a vmware virtual machine running (Windows 2k). 
Now i'd like to connect this virtual machine through the VPN, too.

All my attempts did fail...

The virtual machine runs with a "host only" network (vmnet1). On the 
linux side i tried to configure NAT for translating the vmnet1 addresses 
to the VPN addresses.

For some reason iptables does not translate the address at all :(

My configuration on the linux box:

  ath0: 192.168.178.22/24 = connection to ISP
  subvpn: 192.168.6.1/16 = VPN (tinc)
  vmnet: 192.168.29.1/24 = "host only" net from VMware

  route -n
  Destination     Gateway         Genmask         Flags Metric Ref    
Use Iface
  192.168.178.0   0.0.0.0         255.255.255.0   U     0      0        
0 ath0
  192.168.29.0    0.0.0.0         255.255.255.0   U     0      0        
0 vmnet1
  192.168.0.0     0.0.0.0         255.255.0.0     U     0      0        
0 subvpn
 0.0.0.0         192.168.178.1   0.0.0.0         UG    0      0        0 
ath0

My configuration on the vmware w2k:

  ether nic 192.168.29.128/24, gateway = 192.168.29.1

  i can ping 192.168.29.1
  i can ping 192.168.6.1
  i can not ping 192.168.1.1

tcpdump on 192.168.1.1:
18:22:14.666258 IP 192.168.29.128 > 192.168.1.1: ICMP echo request, id 
512, seq 34074, length 40
18:22:14.666319 IP 192.168.1.1 > 192.168.29.128: ICMP echo reply, id 
512, seq 34074, length 40
18:22:14.666350 IP 192.168.29.128 > 192.168.1.1: ICMP net 192.168.29.128 
unreachable - unknown, length 68

I set up the iptables NAT using fwbuilder. The rule was like this:
Original Source 192.168.29.128 Translated Source 192.168.6.1
Every thing else is unchanged.

No idea what's going on here...

Any help would be greatly appreciated!
Till