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"
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