Spanning Tree Protocol:
Multiple interconnected bridges create larger networks using the IEEE 802.1d Spanning Tree Protocol (STP), which is used for finding the shortest path within network and to eliminate loops from the topology.
If the STP is turned on, the Bridge device will communicate with other network devices by sending and receiving Bridge Protocol Data Units (BPDU). STP should be turned off (selected by default) when the device is the only bridge on the LAN or when there are no loops in the topology as there is no sense for the bridge to participate in the Spanning Tree Protocol in this case.
Bridge mode Firewall Configuration Settings
Firewall functionality on bridge interface can be enabled using the "Enable Firewall" option. Bridge Firewall rules can be configured, enabled or disabled while using Firewall configuration window which is opened with the "Configure" button.
Firewall entries can be specified by using the following criteria: Interface the interface (WLAN or LAN) where filtering of the
IP Type sets which particular L3 protocol type (ICMP, TCP, UDP, P2P) should be filtered;
Source IP/mask is the source IP of the packet (specified within the packet header), usually it is the IP of the host system which sends the packets;
Source Port is the source port of the TCP/UDP packet (specified within the packet header), usually it is the port of the host system application which sends the packets;
Destination IP/mask is the destination IP of the packet (specified within the packet header), usually it is the IP of the system which the packet is addressed to;
Destination Port is the destination port of the TCP/UDP packet (specified within the packet header), usually it is the port of the host system application which the packet is addressed to.
Comments is the informal field for the comment of the particular firewall entry. Few words about the particular firewall entry purpose are saved there usually.
On flag enables or disables the effect of the particular firewall entry. All the added
firewall entries are saved in system configuration file, however only the enabled firewall entries will be active during the system operation.
New Firewall entries can be saved by activating Apply button or discarded by activating Cancel button in the Firewall configuration window.
All the active firewall entries are stored in the FIREWALL chain of the ebtables filter table, while the device is operating in Bridge mode.
Click Apply Setting and Save Changes button to save the changes made in the Network page.
