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My Sonicwall TZ200 is Killing My Internet Speed

I have a fairly sophisticated setup for my Sonicwall TZ200. I have 3 internet connections: 1) A traditional T1 @ 1.544mbps, 2) AT&T DSL at 6mbps, and 3) Comcast at 24mbps.

I've played with various load balancing schemes, but what has worked best, until recently, is a simple failover system where all my outbound traffic goes out and comes in via Comcast, my email traffic uses the T1, and the AT&T connection acts as a backup connection.

When I tried some percentage based stuff, it worked, but when some users reported the connections being slow, it was always hard to tell who (which connection) was responsible.

Anyway, things were going swimmingly until just a few weeks ago when users began complaining about connections being really slow.

We had been making some changes recently because the TZ200 had been freezing up and Sonicwall had me redo the entire configuration by hand because of that. That issue turned out to be because we were using the DHCP server in the Sonicwall and that didn't cooperate with our Sonicpoint setup. The Sonicpoint would freeze up and stop shipping traffic for no reason. As soon as we moved the DHCP server to a Windows Server and shut that down, our Sonicpoint problem went away.

(I digress again...)

Anyway, after that, things had gone very well until, suddenly a few weeks ago, the performance on the wired network was just horrible! We are supposed to be getting 24mbps down from the Comcast connection, but we were lucky to get 10% of that. Our ping times were horrible at 500 to 1000 msec instead of the usual 20 or 30 msec.

Well, as sometimes happens, it took a lot of serious investigation to finally figure out what was wrong...

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