I can share with you that we recently tried to make this happen via our Intranet, and you are going to run into authentication/permission issues. We got the package stored in MSDB to execute via ASP.NET page when running page from Visual Studio server on a remote admin machine, but when the page was deployed to the Intranet, the package would fail. Looked all over for a way to make it work, but there's no obvious workaround that we could find. We then created a job for the package and called an SP from ASP.NET page to run the job, but we had similar issues with that, and we finally gave up. Lots of people seem to have the idea that in theory this should work, but I have not found anyone who has been able to successfully achieve it from IUSR or ASPNET user accounts.