DNS Configuration on a Managed Switch

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Christopher Moran

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Aug 11, 2014
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I run a network at my school. We have a Sonicwall Firewall between cable Internet and our Windows network. On the network there are managed switches and wireless APs attached to a wireless controller. My network loses sight of the Internet for periods of 5 to 10 minutes a couple to a few times a day. The Sonicwall can see the Internet so it must be a internal network problem. I'm guessing either something on the switches or in my server. The server governs DHCP. If nothing else in my description triggers an idea, could it be possible that my DNS settings are wrong? My question is, how should DNS be set in switches, should I have the DNS for the firewall and the server list or just one of them. Should DNS be set a certain way on the server? I'm a bit lost when it comes to this stuff...
 
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jwk3

jwk3

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Feb 29, 2012
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My suggestion, assuming you have Windows domain controllers (and thus Windows DNS server role installed) is set the DHCP clients (as in the "server options" option in the DHCP GUI) to use your Windows DNS servers firstly, and then the Sonicwall in addition if you are having issues, so your domain controllers set as DNS, then your sonicwall or proxy as your gateway, this should be the same for your servers static network config.

how do you have your switches set up? do you VLAN off your traffic or is it one flat network?
 
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