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SonicWall Pro VX traffic slow between DMZ and LAN

Posted on 2004-09-15
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Last Modified: 2013-03-18
We have a single SonicWall Pro VX and have placed a file server in the DMZ.  We are experiencing very slow network speed in between the DMZ and the LAN.  We have isolated this down to essentilally the firewall DMZ and LAN, we have tested all the cables, switches, etc. in between those points.

Speed between LAN and WAN is good, and speed between DMZ and LAN is acceptable, usually as fast as the WAN pipe allows.

Speed between the DMZ and LAN is terrible, usually about 3 KB/sec.  We have the firewall interfaces set to 100MB Full duplex, the WAN is set to 10MB Half duplex (we've tried all the setting there, but this isn't our problem spot anyway).

THe firewall does have content filtering on, but it has been disabled between DMZ and LAN.  MTU is set to 1404 and there is no bandwidth limitations set.  Also, no strange rules setup either.

Thanks for any help on this!!

-Brian
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Question by:bgodden
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by:Tim Holman
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So if you rip the firewall out, and put a crossover cable in between the server on the DMZ and a client inside, then the performance is still the same ??
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by:bgodden
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Don't need to get them that close, if the server in the DMZ are in the proximity of either switch (LAN or DMZ), the speed it 100 MB/s
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by:bgodden
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with the client that is
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by:LimeSMJ
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I'm not sure what you meant by your second comment but...

I think what tim_holman was trying to suggest was to put a client machine inside the DMZ and test the file transfer speeds within the DMZ... just to make sure it's not the server itself causing the slow transfer speeds.
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by:Tim Holman
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Agreed - this is far too slow for even a firewall to cause (unless perhaps its routing is screwed up) !
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by:bgodden
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I didn't explain well either, I had the server and the client together on the switch that is connected to the DMZ (i.e. brought the client out to the DMZ) and also brought the server into the LAN, performance was good so it wasn't the server...  How do I check the routing?  There is one static route setup, but it's over my head on how it should be...
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by:Tim Holman
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Check the routing by doing a TRACERT {server IP} from the client machine behind the firewall, to the server in the DMZ.
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by:bgodden
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OK, I see, I get a single hop from the client to the server in the DMZ
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Tim Holman earned 500 total points
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Setting the MTU low on the firewall is unusual.  I would set it back to 1500.  It's only with dial-up and encryption that MTU starts causing issues anyway.
I'm presuming client and server are on different subnets ?
So - is this maybe a name resolution / DNS problem ?  Maybe if you use the host name, your client is looking it up in the wrong place and causing this delay ?  Same goes for WINS.
Apart from that, try the latest SonicWall firmware update.
I've had a good look around support.sonicwall.com's knowedge portal, but nothing pertaining to DMZ performance other than DMZ setup documents, which may all be worth checking to make sure you've set this up properly.
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by:bgodden
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Tim, thanks for your work on this, oddly enough, we finally tried setting all the firewall interfaces to auto negotiate and the problem went away!  All these interfaces set themselves to what we had forced, so apparently the forcing was causing some consfusion for TCP traffic.
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by:Tim Holman
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Auto-negotiated 100FDX and manual 100FDX are slightly different things.  With auto-neg things like flows and window sizes are also negotiated, whereas with manual 100FDX you're stuck with static values.
This varies from vendor to vendor...
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by:bgodden
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OK, good to know.  Thanks!
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