SonicWALL NSA E7500 Getting Started Manual page 41

Note:
Do not enable Never route traffic on the bridge-pair
unless your network topology requires that all packets
entering the L2 Bridge remain on the L2 Bridge
segments. You may optionally enable the Block all
non-IPv4 traffic setting to prevent the L2 bridge from
passing non-IPv4 traffic.
If You Are Following
Scenario...
C - L2 Bridge Mode
Page 40 Configuring a State Sync Pair in NAT/Route Mode
Proceed to Section:
Additional Deployment
Configuration
- page 41