Procurve switches and SonicWALL Sonicpoint

Need help please.
I have a test system setup as follows
Sonicwall NSA2400, X0 is the LAN port on 172.31.255.254. X1 is the WAN port. X2 is set as the WLAN on 172.16.10.1 (used solely for provisioning sonicpoints). X2:V20 on 10.10.50.1 and X2:V30 on 10.10.60.1.  DHCP's are setup for all 3 VLANS.
X2 is connected to first procurve on port 1. Port 1 is tagged with VLAN 20 & VLAN 30, untagged on Default VLAN. All other ports are untagged for Default VLAN.
X0 from SonicWAll NSA is in port 3.
Port 2 on the Switch is tagged for all VLANS.
Procurve 2 has port 1 tagged for all 3 VLANS.  Port 24 is tagged for VLAN 20 and VLAN 30 and untagged for default VLAN.
Sonicpoint N is plugged into port 24.
The Sonicpoint does provision OK, my problem is that when I plug a PC into the switches I am sometimes getting an IP address in the range of the default VLAN and not from my DHCP server. My VLAN knowledge isn't brilliant nor my procurve setup, could use some help please.
Thanks
AndyARAAsked:
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nociSoftware EngineerCommented:
you should create a vlan 40and use that untagged on port 3, add it tagged to the trunk and untagged again on port 24 of switch 2.

Then VLAN 0 & 40 will be separated.
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AndyARAAuthor Commented:
I'll give that a go thanks
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AndyARAAuthor Commented:
Thanks, soon as I added that VLAN it made sense to me....couldn't see the wood for the trees till then.
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