Uncompress Cisco IOS for GNS3

After you have HEX your dynamips with the magic codes :) Depending on the Pagent IOS you are trying to load, you might need to uncompress it. Its documented at the GNS3 page under FAQ : Images for 2600 routers must be uncompressed to work.

Benefit of uncompressing IOS is that under GNS3, it boots faster during loading it being uncompressed.

1. Go ahead and download the Cisco binary image unpacker v0.1 [LINK]
2. Extract the unpacker to harddisk
3. Because the unpacker is a command line based tool, you need to run it via command prompt eg. cmd
4. Goto Run > cmd
5. Depending where you extract the unpacker, you will need to “cd” to the directory eg. cd C:\Unpack
6. After you “cd” to the folder you can display the available parameters by typing unpack.exe
7. You will get something like : unpack.exe [--output file] [--format <IOS|ASA7|ASA8> ] <binary image>
8. For simplified process, copy the IOS which you want to uncompress to the same folder as the unpack.exe
9. Uncompress the IOS as shown below

C:\Unpack>unpack.exe –format IOS c2600-tsjspgen-mz.bin
warning [c2600-tsjspgen-mz.bin]:  16816 extra bytes at beginning or within zipfile (attempting to process anyway)
IOS binary image successfully unpacked in c2600-tsjspgen-mz.bin.unpacked

10. After that you put the IOS with all the IOSes for your GNS3
11. Fire up GNS3
12. Add the uncompress IOS to the available IOS list by GNS3 > Edit > IOS images and hypervisors > Settings > Image file > Select your IOS and Click Save
13. Close
14. Select the particular Node Type which has the IOS
15. Start the device

Install Cisco Pagent IOS TGN Traffic Generator On GNS3 [LINK]

October 21, 2011 | Filed Under Tech 
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