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Sonicwall in parallel with ISA Server

My company has a SonicWall that they want to use as a gateway to filter web based viruses and spyware. We may also move the VPN from our ISA Server to the Sonicwall. I plan to connect a switch to our cable modem and run the web traffic to our LAN. all of the other IP traffic will go through the ISA Server.Does anyone have any opinions on this setup. Is there a better way to do this by running the Sonicwall in a series with the ISA Server. My company has about 100 users,
1 Solution
I have an environment similar to your as far as users are concerned.  I wouldn't run any traffic from the cloud directly to your LAN.  I would put your sonicwall in front of ISA then attach ISA's external nic to the sonicwall's internal interface.   Essentially you are creating a protected DMZ of sorts.  Set the internal interface of the sonicwall as the gateway for ISA. Connect ISA's internal nic to your LAN.  Make sure there is no gateway on ISA's internal and DNS is set to you internal DNS servers.  The ISA external nic will have a dmz address, subnet and the address of the sonicwall's internal interface as the gateway...no DNS servers...netbios disabled as well.  Make sure you use the cmd and the route add command to add your internal networks.  

Anyway...  Shinder has a couple good books that tell you how to setup the ISA in detail.  Worth a look.

After ISA is setup...You should be able to then do all your filtering with the sonicwall and still gain the massive benefits of using ISA.
Well done!
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