How to set up a virtual DMZ on Linux with udev ?

Problem: I set up VMWare Server incl. MUI successfully and very straigthforward on Lineox Enterprise Linux 4.0. The server has two NIC's: eth0 and eth1.

I like to build a firewall VM and a DMZ VM, but have trouble with the virtual network configuration. The communication routes shall be:

Internet <eth1 Firewall VM <(vNat or vHostonly?) Host network \--eth0-- internal LAN

and

Internet eth1> Firewall VM switched vNic> DMZ VM

and

Host network (vNat or vHostonly?)> Firewall VM switched vNic> DMZ VM

The virtual switch seems not to work, maybe because Lineox uses udev (which seems to remove not-used devices like vmnet4 etc.).

My problem is, that with "host-only" the DMZ gets connected with the host network - which I like to prevent in any circumstances!

I tried to bind the third virtual NIC to vmnet3 or 4 (to get a virtual switch), but then always I get an error "Could not open /dev/vmnet3 (or 4 or 5 ...) no such file or directory Virtual device Ethernet1 will start disconnected"

Then I tried to use mknod (like in thread http://www.vmware.com/community/thread.jspa?messageID=374178&#55597;&#56738;). After that, the error message disappeared, but the vmnet3 still does not work. I get no connection between the two virtual devices which should be in the same vlan.

What is wrong?

Is there somewhere a HOWTO how to cover this issue on a Linux host which uses udev ?

Thanks a lot!