Understanding VLANs with PowerConnect 6224/6248

Hi,

New swtiches has just been delivered to us and I'm struggling with understanding VLANs. I've got SonicWall firewall which allows me to create virtual (sub-)interfaces on the single physical interface. I created 2 for tests. What I require is to communicate within all VLANs I would have. I would put untagged VLANs but unfortunately I cannot have multiple untagged VLANs on one port and also SonicWall restricts to have tagged VLAN on the interface. So I went through GUI and I didn't find any options to configure tagged VLANs. I was really surprised they are not there! But started digging the Internet and I found it's possible from CLI. So I went to CLI, configured everything and... it doesn't work. I can't ping firewall at all. 

Configuration: 

SonicWall has a LAN interface setup as 192.168.168.168 (default) with 2 VLANs on it with IP 10.0.0.1 (V10) and 20.0.0.2 (V20). 

I enabled all rules to ping and to respond under these IPs. Went to Dell switch and put configuration like:

!Current Configuration:

!System Description "Dell 24 Port Gigabit Ethernet, 2.2.0.3, VxWorks5.5.1"

!System Software Version 2.2.0.3

!

configure

vlan database

vlan  2,10,20

vlan association subnet 10.0.0.0 255.0.0.0 10

vlan association subnet 20.0.0.0 255.0.0.0 20

exit

stack

member 2 1

member 4 1

exit

ip address 192.168.0.235 255.255.255.0

ip default-gateway 192.168.0.1

interface vlan 10

name "test"

exit

interface vlan 20

name "test"

 

 

exit

username "admin" password 0192023a7bbd73250516f069df18b500 level 15 encrypted

!

interface ethernet 2/g1

spanning-tree portfast

switchport mode general

no switchport general acceptable-frame-type tagged-only

switchport general allowed vlan add 10,20 tagged

exit

!

interface ethernet 2/g2

spanning-tree portfast

switchport mode general

no switchport general acceptable-frame-type tagged-only

switchport general allowed vlan add 10,20 tagged

exit

snmp-server community public rw ipaddress 192.168.0.232

exit

 

So my server is connected to port 1, sonicwall to port 2. 
I can't ping sonicwall, sonicwall can't ping me.

I tried to assign IP addresses to both vlan interfaces but it didn't help. What really was strange for me, when I assigned IP addresses to vlan interfaces, and tried to ping them from switch they didn't reply back! Why ?
I don't really understand the way how it works. Please help me with sorting it out.

Thank you for your help in advance.

Regards,

Jarek