Install, Configure and Run Dynamips in Windows 7
Dynamips, in case others don't know, is like VMware Workstation for Cisco devices. When I was preparing for my CCNA exam, Dynamips was truly helpful and made a difference because it gives you the real look and feel of the IOS environment in contrast to "Panget"... I mean Packet Tracer. I was asked to try running Dynamips in Windows 7 because others weren't able to make it work. It runs fine but has a little drawback; the live network interaction doesn't work due to permission issues that am still trying to figure out. Nevertheless, plainly messing with it to try out a laboratory simulation is very much possible. So, here you go:
- Download the latest WinPcap and Dynagen.
- Install WinPcap first, then Dynagen.
- Download your preferred IOS and copy or save it to this location:
C:\Program Files\Dynamips\images
Note: Sorry, can't provide you the IOS. You can, however, Goggle for it 
- Copy your network file to this location:
C:\Program Files\Dynamips\sample_labs
Click HERE to download a sample network file.
- Right-click the network file and open it with WordPad.
- Edit the following parameters:
image=C:\Program Files\Dynamips\images\cisco_ios.BIN
Cisco_IOS.BIN is the actual name of your Cisco IOS
workingdir = C:\Program Files\Dynamips\sample_labs\my_lab
my_lab the folder you need create to store Dynamips emulator files
- Close WordPad and click Save when prompted.
- Open the Control Panel then click System and Security.
- Click Allow a program through Windows Firewall under Windows Firewall.
- Click Change settings and click Allow another program.
- In the Add a Program window, click Browse under Path and locate dynagen.exe.
Notice that dynagen.exe is now being listed and highlighted under Programs
- Click Add and click OK.
- Click Control Panel Home and click Programs.
- Under Programs and Features, click Turn Windows features on or off.
- From the list of Windows features, select Telnet Client and click OK.
- Close the Control Panel.
- Click the Windows Orb then type dynamips in the Search Programs and Files field and hit Enter.
- When you see Dynamips Server listed, hit Enter.
- Click Allow access when prompted by a Windows Security Alert dialog.
- Once Dynamips is up and running, double-click your network file.
You should see something like this
- In the Dynagen Console, type start R1 then hit Enter.
- Now type idlepc get R1 and hit Enter.
Repeat this process until you see something like this
Take note of the value with the asterisk.
- Key-in the number where the asterisk appears and hit Enter.
- Type idlepc save R1 db and hit Enter.
- Type exit all and hit Enter.
- Double-click your network file again.
- In the Dynagen Console, type start R1 and hit Enter.
- Still in the console, type console R1 and hit Enter.
Congratulations! You now have Dynamips successfully running in Windows 7.