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optimizing firewalls

Posted on 2016-10-25
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Thank you for taking the time to view my question.  Churches don't run at the speed of business.  Our Church needs to upgrade our firewall to improve throughput, content filtering and throttle guest users.  Our 10 authorized users occupy 16 stations thru the campus utilizing a 50/8 Mbps connection to sudden link.  Usually fewer than 20 guest users download content from the  4 protected wireless APs at peak times.

The Dell TZ 300 w/ a three year plan seems like a no brainer for speed and protection.  It even provides the fiber connections to future proof a new multi-use building due to come online next year.  Some naysayers want to over-purchase the TZ500 or equal to future proof DPI needs, but we plan to replace the unit in 5 years well before the time we plan to jump to 200 Mbps speeds.  For our level of networking this seems like overkill.  Is the DPI 100Mbps at each connection?  Help us save money for the orphans j/k.
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Question by:josh black
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Dr. Klahn earned 1000 total points (awarded by participants)
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Is the DPI 100Mbps at each connection?

I'm not quite sure what you mean, but if the sense of your question is "Does each user have 100 Mbps access to the internet?" -- then no, because the connection to the ISP is only 50 Mbps.

As a side note, unless there are serious problems with hostile users it would be unusual to do deep packet inspection at every connection.
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by:Cyclops3590
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I agree, DPI dramatically slows throughput and most of the time doesn't capture anything.  It's kind of like the flu virus.  Yes, it may catch some stuff.  But the rules are based on yesterday's vulnerabilities.  So catching existing ones is far less likely.  Personally I'd leave it off.  Any issues you may have should be readily seeable thru abnormal traffic surges.  Or better yet, setup a snort server.  at least then it won't impact traffic and you can tune it to your needs much easier.
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by:masnrock
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In all honesty I'd be asking two questions:
1) Will the church actually replace the firewall in the mentioned 3 year window?
2) Will the upgrade in connection speed occur sooner?

If I take the questions out of account, I'd say the TZ300 is fine based on your current needs. Assuming that you have a VLAN for the guest wireless, I'd recommend doing something along the lines of using the Sonicwall's Bandwidth Management. That should address at least a subset of your problems.
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