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SonicOS 5.8.1 Administrator Guide
Configuring the Secondary Bridge Interface
Step 1 On the Network > Interfaces page, click the Configure icon in the right column of the X0
(LAN) interface.
Step 2 In the IP Assignment drop-down list, select Layer 2 Bridged Mode.
Step 3 In the Bridged to drop-down list, select the X1 interface.
Step 4 Configure management (HTTP, HTTPS, Ping, SNMP, SSH, User Logins, HTTP Redirects).
Step 5 You may optionally enable the Block all non-IPv4 traffic setting to prevent the L2 bridge from
passing non-IPv4 traffic.
VLAN Filtering (on SonicWALL NSA series appliances)
• You may also optionally navigate to the VLAN Filtering tab to control VLAN traffic through
the L2 bridge. By default, all VLANs are allowed:
–
Select Block listed VLANs (blacklist) from the drop-down list and add the VLANs you
wish to block from the left pane to the right pane. All VLANs added to the right pane will
be blocked, and all VLANs remaining in the left pane will be allowed.
–
Select Allow listed VLANs (whitelist) from the drop-down list and add the VLANs you
wish to explicitly allow from the left pane to the right pane. All VLANs added to the right
pane will be allowed, and all VLANs remaining in the left pane will be blocked.
Step 6 Click OK.
The Network > Int
erfaces page displays the updated configuration:
You may now apply security services to the appropriate zones, as desired. In this example, they
should be applied to the LAN, WAN, or both zones.
VLAN Integration with Layer 2 Bridge Mode
VLANs are supported on SonicWALL NSA series appliances. When a packet with a VLAN tag
arrives on a physical interface, the VLAN ID is evaluated to determine if it is supported. The
VLAN tag is stripped, and packet processing continues as it would for any other traffic. A
simplified view of the inbound and outbound packet path includes the following potentially
reiterative steps:
• IP validation and reassembly
• Decapsulation (802.1q, PPP)
• Decryption
• Connection cache lookup and management
• Route policy lookup
• NAT Policy lookup
• Access Rule (policy) lookup
• Bandwidth management
• NAT translation
• Advanced Packet Handling (as applicable)
–
TCP validation
–
Management traffic handling
–
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