Go CCIE Go!! - A Cisco Certified Internetwork Expert

Dear all: I’ve been trying to do something that sounds simple but have been unsuccessful so far. I want to “see” traffic at different points of a topology using a sniffer (i.e. wireshark).
So idea was… but a hub (virtual, of course) in different places and connect to a loopback interface and take a peek wherever. No luck. I don’t want to put IP addresses there (desktop) cause it would be modifying my desktop routing, and my desktop is part of the topology.
Problem seems to be that both wireshark and dynamips use pcap, and they are not able to see injected packets. I thought a loopback would work… but it does not, or I am doing something wrong.
The only way I was able to do it is by having a real hub short circuiting two real interfaces and puting one in the virtual hub and using wireshark in the other. Is there anything like a tun/tap pair for windows ? Or is there a way for dynamips to “drive” the tap interface like [pqj]emu does ?
Hoping for some light to do it -tron
– Carlos G Mendioroz LW7 EQI Argentina