D-Link DFL-800 Product Manual - Page 217
Spanning Tree BPDU Support, Bridge Protocol Data Units
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4.7.4. Spanning Tree BPDU Support Chapter 4. Routing 3. Click OK 4. Go to Rules > IP Rules > Add > IPRule 5. Now enter: • Name: HTTP-WAN-to-DMZ • Action: SAT • Service: http • Source Interface: wan • Destination Interface: dmz • Source Network: all-nets • Destination Network: wan_ip • Translate: Select Destination IP • New IP Address: 10.1.4.10 6. Click OK 7. Go to Rules > IP Rules > Add > IPRule 8. Now enter: • Name: HTTP-WAN-to-DMZ • Action: Allow • Service: http • Source Interface: wan • Destination Interface: dmz • Source Network: all-nets • Destination Network: wan_ip 9. Click OK 4.7.4. Spanning Tree BPDU Support NetDefendOS includes support for relaying the Bridge Protocol Data Units (BPDUs) across the NetDefend Firewall. BPDU frames carry Spanning Tree Protocol (STP) messages between layer 2 switches in a network. STP allows the switches to understand the network topology and avoid the occurrences of loops in the switching of packets. The diagram below illustrates a situation where BPDU messages would occur if the administrator enables the switches to run the STP protocol. Two NetDefend Firewalls are deployed in transparent mode between the two sides of the network. The switches on either side of the firewall need to communicate and require NetDefendOS to relay switch BPDU messages in order that packets do not loop between the firewalls. 217