I have a Virgin (previously NTL) cable modem broadband connection with 20Mbps download (soon to be upgraded to 50Mbps). However, when I do a broadband connection speed test at:
I only see a download speed of 2084 kbps (i.e. 2Mbps, not 20Mbsp). I have connected my laptop directly into the SonicWall TZ170 (which in turn is connected to the Virgin Cable Modem). I rang Virgin and they confirmed I should be seeing 20000kbps. A Virgin engineer came round, and plugged directly into the cable modem, and got a connection speed of 20Mbps, so looks like it's the SonicWall TZ170 that's throttling the connection.
On the SonicWall Admin interface, on the Network > Settings tab I have a WAN interface with a status of "100 Mbps, full duplex". Under the config for this I have "auto-negotiate", "Proxy management" unticked, "Fragements non-VPN outbound" ticked, "Ignore DF" unticked" and most importantly "Enable Bandwidth Management" unticked. Note, under this option, if I was to throttle it, it has "Available WAN bandwidth (Kbps)" of "20.000" greyed out which is odd.
(I have the same connection speed on another computer too).
Any help much appreciated.