Supernetting and MS administrators...

rjbarlow

Hi all,

flat question :

- MS network administrators (intended as administrators of classic private infrastructures), have ever to do with supernetting? And You?

Wait for answers.

royal

Not really. I've never worked with it other than the MCSE books. Haven't really worked with subnetting much either. The subnetting I have worked with is in larger deployments where they were doing actual subnetting /22, /23, etc... I would have to make sure that the correct network ID was entered into Active Directory Sites and Services.

For example, I was at a client with about 15,000 users globally and I re-structured their Active Directory Sites and Services to 2 new Data Centers with a removal of their old data center. Everything was subnetted. I think it was /22. That's 255.255.252.0.

So let's say you have 10.10.10.5. They may add that network to the 10.10.10.0 subnet. It's not actually on that subnet. It would be if it was /24. But since it's subnetted, it's actually on the 10.10.8.0 network. You would have had to add the 10.10.8.0 network to the Sites and Services as a subnet object and attach it to the site it belongs to.

These are the things you need to understand. Learn how to subnet/supernet, do the ANDing process, and learn how the system works and how it can affect Active Directory. In the real world, you won't have to manually calculate all these things as a Windows Administrator. Personally, I use the following site to enter subnetted addresses into to see what netmask they are a part of and ensure Active Director Sites and Services includes that subnet.

http://jodies.de/ipcalc