When to use SOnicwall transparent vs bridge mode

When to use Transparent Mode and when to use L2 Bridge Mode

Requirement	Mode
Need to pass non-IPv4 traffic	L2 Bridge Mode as Transparent Mode passes only IPv4 traffic.
Need to pass broadcast traffic	L2 Bridge Mode as Transparent Mode drops broadcast traffic(exception being NetBios).
Multiple Subnets support	L2 Bridge Mode as Transparent Mode only supports a single subnet(that which is assigned to, and spanned from the Primary WAN).
VLAN traffic	L2 Bridge Mode as VLAN traffic is passed through the L2 Bridge and inspected as opposed to Transparent Mode where VLANs will be terminated by the SonicWALL rather than passed.
No disruption to most network communications	L2 Bridge Mode as Transparent Mode may introduce a certain level of disruptiveness; particularly with regard to ARP, VLAN support, multiple subnets and non-IPv4 traffic types.
PortShield interfaces support	Transparent Mode as PortShield interfaces cannot be assigned to either interface of an L2 Bridge Pair.
If more than two interfaces are required to operate on the same subnet	Transparent Mode as two interfaces are the maximum allowed in an L2 Bridge Pair.
DHCP services support	Transparent Mode as L2 Bridge Pair can only pass DHCP.
Running SonicOS Standard	Transparent Mode as L2 Bridge Mode requires SonicOS Enhanced.
Simultaneously Bridge and route/NAT	Mixed L2 Bridge Mode.