We are in the same boat. We have allowed Skype for Windows on our University network but are under a lot of pressure to allow Macs to use Skype as well. The lack of a roadmap from Skype doesnt do their reputation a lot of good and leaves us looking a bit daft. I think that Skype should come clean about their intentions if they are to be taken seriously as a business tool. – Budge (2008-Feb-17)
When will we have the ability to disable skype supernode functionality. It prevents the use of the linux and Mac clients at many universities. Is there an ETA on that? – gandalf.come (2008-Mar-26)
We had our solution for Windows over twelve months ago but are still waiting on a viable solution for our Mac clients. In the Skype Universities section they give methods to prevent Skype from becoming a supernode, but these are still mainly applicable to Skype for Windows, and with Skype for Mac OS X being stuck at version 2.7 the future looks none too bright for a 3.x release any time soon.
There are further complications with reports that the Mac and Linux clients do not become supernodes, although I have not seen definitive proof of this ‘fact’.
… but those that have reverse engineered the protocol suggest that the only playform that has supernode capabilities today is Windows (not even Mac or Linux Skype nodes ever become supernodes).
- MrBlog
The approach taken by CERN is interesting in the fact that they restrict the use of Skype to port 50123 to allow for better network traffic monitoring, I am not sure that this solution is viable in our environment but it worth consideration, where Fermilab uses procedures based on Firewall settings.
I think this one is another untested rumour; Unchecking the use ports 80 and 443 will disable supernode mode. There may be some truth in this given the details regarding configuring firewalls for using Skype.
I can’t connect to Skype from work or due to a restrictive firewall. Which ports need to be opened in order to use Skype?
If you aren’t familiar with firewalls or ports, it may be a good idea to ask a system administrator or tech-savvy friend to help you. The minimum requirement is that Skype needs unrestricted outgoing TCP access to all destination ports above 1024 or to ports 80 and 443 (the former is better, however). If you don’t allow either of those, Skype will not work reliably at all. Voice quality and some other aspects of Skype functionality will be greatly improved if you also open up outgoing UDP traffic to all ports above 1024, and allow UDP replies to come back in. … – Skype Knowledgebase
… looks like we’re still waiting 
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Follow up post: Skype (Mac) – how not to be a supernode (2008-Sep-05)
Revise this or take it down. It is no longer factual.
Thanks
@Dave,
if you look directly below this post in the track back articles, or browse the “Skype” tag, you will see that there is a follow up post from 2008-Sep-05 “Skype (Mac) – how not to be a supernode” – please note this is a blog with notes as I work through to solutions and not a Wikipedia article; the post was correct at the date of posting.
Archived posts are referred to from updated or improved posts as I work through to solutions.
cheers