Tag Archives: SDM

Installing SDM On a Dynamips or GNS3 Router

I’ve seen several comments on the forums where folk have not been able to install SDM to the router memory. The IOS is usually a 12.4T series one. Here is a workaround which involves using a 12.4 or earlier IOS. In this case I used a 3725 with a 64MB flash card.
First attempt to install onto 12.4T with empty flash – reports

"Unable to eastablish connection with the router"

Continue reading

SDM on Dynamips/GNS3 Routers

I’m a long way from home and my real router lab this week so having to make do with the amazing DynaMips emulator, which just happens to run real IOS images. I have the choice of running this either with the Dynagen package on Mac OSX or GNS3 on Windows.

I wanted to configure some C3725 images for CCNA Security simulations and as part of that, install SDM 2.5 into the router flash memory. Unfortunately this proved difficult with IOS 12.4T but I managed to persist and find a workaround.

First attempts using IOS c3725-advsecurityk9-mz.124-15.T14.extracted.bin – No luck, the Windows SDM installer continually fails with the message “Unable to establish connection with the router”.

So next I roll back my IOS to c3725-advsecurityk9-mz.124-25d – I ran the installer again and was able to load SDM into the virtual router flash.

Finally, re-configure with IOS 12.4T and I can launch SDM running on the router


I’ve finally reached a working solution for SDM with the aid of the brilliant multi-platform VirtualBox. I can run this set-up on OSX Snow Leopard or XP/Vista.

I used a Windows 2000 Professional VM that I had available and I’ve set it up to meet the SDM requirements.

  • Internet Explorer 6 SP1 as w2K ships with IE5.
  • Java JRE 1.6.0_03 – This can be found in the Oracle Java Archives.
  • Disable Java Updates in the Java settings in Windows Control Panel.
  • Set the Java User Runtime parameter to -Xmx256m in Java Runtime Environment Settings, otherwise you’ll get an error message from SDM when you try and access the IPS menu item.
  • Install SDM 2.5.

Please understand that W2K is no longer supported by MS so this should only be used for SDM in a controlled environment. Continue reading

Security Device Mangler

SDM 2.5I originally rubbed shoulders with Cisco’s Router and Security Device Manager, known to most people as SDM, during my ICND1 studies. Whilst it seemed to work well enough to do NAT and other basic router tasks, I was never satisfied it was working properly for me. As I have now decided to progress with the CCNA Security studies, I find that SDM is central to these and now I have managed get it working 100%! Continue reading