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http://www.ipflow.utc.fr/index.php/Cisco_7200_Simulator

In the URL you cand find the brief:
"At this time, the emulator I have programmed is able to boot a large
number of Cisco IOS releases available for the 7200 platform, including
the latest 12.2S and 12.4. "


Usage@Windows:
1.Use your network adapter work with the emulator
dynamips -p
0:C7200-IO-FE:gen_eth:"\Device\NPF_{40371D28-B992-495E-AD5C-C3ED05DCB000}"
image.bin

You can find the info ""\Device\..." in Ethereal( or "dynamips
-e"),also you can capture the IP packet which come from the emulator.So
you can use it combine with network device or
Zebra(http://www.zebra.org/) ,Quagga(http://www.quagga.net/) in
VMWare's Virtual Network.


2.Three emulator interlinkage
R1
$ dynamips -p 0:C7200-IO-FE:udp:10001:127.0.0.1:10002 image.bin

R2
$ dynamips -p 0:C7200-IO-FE:udp:10002:127.0.0.1:10001 -p
1A-FE-TX:udp:10003:127.0.0.1:10004 image.bin

R3
$ dynamips -p 0:C7200-IO-FE:udp:10004:127.0.0.1:10003 image.bin