Bandwidth Issues

I currently manage a network with 40 end users, a few printers, a DC, a few NAS's, etc...

My network consists of a TZ300 SonicWall, 2 unmanaged Cisco switches, and a NetGear Nighthawk X6 Wireless Router. We currently have a 100Mbps business class fiber line coming into the building. The SonicWall has content filter, IPS, Gateway Antivirus, Geo-IP, and Botnet security services enabled.

My LAN is 10.50.2x1.x and the WiFi router is configured with a 10.50.2x2.x management interface. When I run a speedtest (www.speedtest.net) on a computer on the 10.50.2x1.x network I only get about 24-27Mbps download speeds. When I run the same test from my cell phone, which is on the WiFi, I get up to 91Mbps download speeds. I don't understand why the two speeds are so different. If anything I would like to get faster speeds on the machines that are on the 10.50.2x1.x LAN. Also, the Nighthawk WiFi router is connected to the same unmanaged switch the rest of the computers are on.

Any help is appreciated. Thank you.
Christopher HandIT Network EngineerAsked:
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masnrockCommented:
How exactly are things configured? There seems to be something very strange here. Like I'd wonder why everything is connected to the same unmanaged switch when you have 2 subnets.

Does the Netgear get a 10.50.2x1.x address and do NAT to 10.50.2x2.x addresses? I don't see any signs of VLANs given that you're using umananged switches.

I currently manage a network with 40 end users, a few printers, a DC, a few NAS's, etc...
Could you give an idea of what falls within "etc"? For example, are there VoIP phones?
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JohnBusiness Consultant (Owner)Commented:
To the above comment, look at (find out) the throughput of the switch / router between .1 and .2
Second, try a different computer for the speed test.
Third, on your test computer, run TCP/IP Reset

Open cmd.exe with Run as Administrator
Then: netsh int ip reset c:\resetlog.txt
Then: ipconfig /flushdns

Restart after this test.
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Christopher HandIT Network EngineerAuthor Commented:
Hello - We actually have 3 unmanaged switches. The VoIP Phones are connected to a dedicated unmanaged switch which is then connected to another interface on the SonicWall. The two other switches are linked together and connect to a separate interface on the SonicWall. The NetGear is connected to one of the unmanaged switches on the LAN but is configured with a management interface of 2x2.x However, the internet port has a static IP address of 10.50.2x1.2xx, which I can ping from my computer in the same subnet. So even though, the WiFi router IP is on a 2x2 subnet, it's still configured to use the 2x1 IP and gateway, if that makes sense.
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masnrockCommented:
What if you remove the wireless entirely, do things suddenly improve? Personally speaking, I would have the wireless on a different interface, and acting like an AP.
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JohnBusiness Consultant (Owner)Commented:
See if you can get the throughput specification. It should be 800 MBits/sec or better
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Christopher HandIT Network EngineerAuthor Commented:
mansrock - I can certainly eliminate the WiFi router and see if things improve. Only 2 cell phones are connected to this at all times so I'm not sure if it will improve the speeds of the LAN or not. I will let you know.

John Hurst - I am currently looking for software that measures the throughput between switches. Once I have the results, I will post.

Thank you!
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Christopher HandIT Network EngineerAuthor Commented:
John Hurst - I used LANBench to test throughput between switch 'S' and switch 'G'. I had one computer connected to one switch and another computer connected to the other switch. Packet size = 2048KB and test duration is set to 10 seconds.
Send results from 'S' to 'G' = 82.7Mbps
Receive results from 'S' to 'G' = 47.4Mbps

These results seem more on the low end. Advice?
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JohnBusiness Consultant (Owner)Commented:
If a direct connection to the fast subnet works fine, then is must  be a limitation of the switch itself.
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Christopher HandIT Network EngineerAuthor Commented:
When I test vice versa I get these results:

Send results from 'G' to 'S' = 90.3Mbps
Receive results from 'G' to 'S' = 84.5Mbps
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Christopher HandIT Network EngineerAuthor Commented:
I used to get faster speeds months ago when we switched to the 100Mbps fiber line using the computers on the LAN. Can power cycling the switches help?
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JohnBusiness Consultant (Owner)Commented:
Nighthawk WiFi router is connected to the same unmanaged switch

You can do a hard reset of the switch (factory restore) and try it again.
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Christopher HandIT Network EngineerAuthor Commented:
Okay I will give that a shot tonight. Thank you.
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masnrockCommented:
I used to get faster speeds months ago when we switched to the 100Mbps fiber line using the computers on the LAN. Can power cycling the switches help?
The short answer to this question is yes. Since they're unmanaged switches, there's no factory restore to do.
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Christopher HandIT Network EngineerAuthor Commented:
I will do that tonight and let you know the results.

On a side note, I performed a speed test on a laptop that I connected to the wireless router and hard wired to the unmanaged switch. Both tests gave me 24-25Mbps down speeds. Looks like my cell phone is the only device getting these super fast speeds...
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masnrockCommented:
Have you tried having a device hardwired directly to the Sonicwall? And also, is the firmware on the wireless router up to date?
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Christopher HandIT Network EngineerAuthor Commented:
Yes, I have hard wired the NetGear wireless router directly to the SonicWall and I still get the fast speeds on my cell phone but if I hard wire a laptop directly to the interface on the SonicWall with a different IP scheme, I cannot resolve DNS due to the DNS server being on a separate subnet.
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masnrockCommented:
What we need is a test of a desktop or laptop connected to the Sonicwall directly. You could probably pull that off, but have to use external DNS servers in order to make things work of course. That way you can be sure that everything else has been taken out of account.

I know you've mentioned unmanaged Cisco switches, but what model are they?
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Christopher HandIT Network EngineerAuthor Commented:
Yep, I set the DNS servers per our ISP and I get the same speeds. The switches are SG102-24 24-port Gigabit Switch.
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masnrockCommented:
Well, you could look at the Security Services setting and try changing to Performance Optimized. Note that doing this will cause packets that are deemed low threats to not get inspected. Another step to try would to try turning off the Gateway AV service. (Yes, these are steps that involve reducing security, but it's possible that the Sonicwall's CPU is getting overworked. I'm also assuming the firmware is update to date)
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Christopher HandIT Network EngineerAuthor Commented:
Wow! I totally overlooked that feature. Now I am getting 77-80Mbps down speeds. Looked like that was it. However, all security services such as IPS, Anti-Spyware, Gateway AV, etc... are still on. What changed exactly?
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JohnBusiness Consultant (Owner)Commented:
Could be the routing inside the switches that you restarted. Other restarts as well?
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Christopher HandIT Network EngineerAuthor Commented:
I actually didn't restart the switches yet. It looks like it was the security setting. I switched from Maximum Protection to Performance Optimized.
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JohnBusiness Consultant (Owner)Commented:
It could be that as well
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masnrockCommented:
What changed is that the Sonicwall is actually working less because it's only inspecting content that's predicted to be a medium or high threat. Maximum Security would inspect also inspect content deemed to have a low threat probability.
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