I understand you would like to know how to open port 5001, so that you could be able to watch your Slingbox. Below are some helpful links:
However, some routers need manual configuration, and that's where the link below comes in:
SlingMedia Support Team!
I'm sorry, but that response was and is far too generic and exceeds this users capabilities. It is my hope that someone or better yet, a some employee of sling media can address the issue directly and specifically for this Arris router.
I attempted to read and digest all of the requirements but because one has to switch back and forth between generic IP address data and the link to the router itself, it's not making a whole lot of sense.
Presently, I have enabled the DMZ zone which allows for one application to be fully exposed (no firewall) as I understand it. Although the Slingbox is listed as a "computer" via Windows, we all know it's not, so I am wondering if just leaving the DMZ open does the job? Please advise. Thank you.