You fix some, you break some ...

When Cisco fixed the tclsh bug in IOS release 12.4, they managed to break another nice feature: you can no longer execute tcl scripts within HTTP server on Cisco IOS. Previously you could use tcl scripts to generate customized outputs or reports that could be viewed through a web browser or even generate parts of HTML code that could be included in web pages served from the router. It's all gone in 12.4(15)T1 ...

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Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.