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Asked by Tenrags in Windows Networking
I have a situation where I my network consisting of 75 plus users and 6 servers experiences wierd performance issues. At first I thought is was a DNS or Active Directory configuration issue but now I believe it's an IP subnet mask issue. I need help to verify. If I try to copy a 100 mb file from a workstation to a server, it can take a fiew minutes and I know that this should only take seconds in a properly configured network. It can sometimes work faster than this. It's intermittent. Here is the history. I used to have two class C networks in two different locations. 192.168.100.0/16 and 192.168.200.0/16. We merged the offices into one physical location. The fastest and easiest way to combine the networks as I was told by a consultant was to just change the subnet mask from 255.255.255.0 to 255.255.0.0. I was reading the CCNA Study Guide (5th edition) and on page 109 it is describing how default subnet masks cannot change. I need to determine if this applies to me. The following statement refers to the default subnet masks for Classes A, B and C. It states "These default subnet masks cannot change. In other words, you can't make a Class B subnet mask read 255.0.0.0., ..... A Class B address must start with 255.255.0.0, and a Class C has to start with 255.255.255.0." So is this what I have going on here that's causing my performance issues? Again, I'm using the standard Class C 192.168 addressing with the standard Class B subnet mask. Need clarification as to whether I can do this or not. Any help anyone can give is greatly appreciated.
20091111-EE-VQP-89 - Hierarchy / EE_QW_3_20080625
