Clients losing Internet connection

Hi, I have a domain with 500 or so clients and some of them randomly drop off the Internet. (80% are wireless clients). My DHCP server is a Windows 2008 r2 box and is also the DNS server. I'm thinking that I have a DNS issue and also thinking that I should add a second (non internal) DNS server to the DHCP assignments (like, but wasn't sure if this could be a security risk. (K-8 school) or could cause other problems. Can you help with this decision? Thanks. Bill
William LarkinAsked:
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JohnBusiness Consultant (Owner)Commented:
I can't see how adding a DNS server would solve people dropping of the internet. Someone else may know better than me on this one.

I would check at least a couple of wireless workstations to make sure:

1. In Device Manager for the wireless card under Power Management that the device is not set to "allow the computer to turn off this device"
2. In Power Management that the wireless card is set to Maximum Performance.

See if that makes any difference. I do understand I am asking to make workstation changes.
Hey Bill. Adding an outside dns in MHO only creates issues. Im guessing the drops are random? Some wired, some wireless? Maybe an issue with gateway. Over loaded?
Mal OsborneAlpha GeekCommented:
I would not be adding a second DNS server.  Windows clients would switch to using if there was some problem with the internal server. This would make them unable to resolve internal DNS names, so they would be unable to log onto the domain, access shared resources etc. Generally, an inability to contact the local DNS server will indicate a loss of basic connectivity, so a second will not really help anyway.

Wireless is notoriously unreliable unless set up very carefully. Sometimes there can be "black spots" even reasonably close to a WAP.   I would suggest throwing some survey software on a cellphone, and wandering around checking you have good coverage everywhere.  You may need to move some WAPs to another channel, or experiment with changing bands. 2.4Ghz is slower, has a longer range but can be interfered with by microwave ovens and cordless phones. 5Ghz is faster, but shorter range.

It is also worth grabbing a copy of Pingplotter.  This is a utility kinda like Ping on crack; it can sit in the background, on a workstation and run pings and tracerts all day, recording times and dropouts on a graph. There is a free version that should be good enough to test connectivity in this setup. Once you have some information on where the connectivity problems are, it should be easier to address.

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William LarkinAuthor Commented:
Thank YOU ALL.. I appreciate your comments and will be using them today to try to get the upper hand on this issue! I will post again of how things are going.
William LarkinAuthor Commented:
Hi.. thanks for all feedback! - Our wireless infrastructure was the culprit! - We have AC AP's and needed POE+ power, only had POE! - Go figure!! - The network troubleshooting steps helped to resolve this issue.  Thanks Again! - Bill
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Windows Server 2008

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