Ubiquiti Networks airRouter HP User's Guide download pdf (Page 24)

Chapter 6: Network TabAirRouter

HP User Guide

Ubiquiti Networks, Inc.

- Primary DNS IP Enter the IP address of the Primary

DNS (Domain Name System) server.

- Secondary DNS IP Enter the IP address of the

Secondary DNS (Domain Name System) server. This

entry is optional and only used if the primary DNS

server is not responding.

MTU Defines the size (in bytes) of the largest protocol

data unit the layer can pass on. When using slow links,

large packets can cause some delays thereby increasing

lag and latency.

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 enabled, the AirRouter HP Bridge 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 AirRouter HP is the

only bridge on the LAN or when there are no loops in the

topology as there is no need for the bridge to participate

in the Spanning Tree Protocol in this case.

Auto IP Aliasing Automatically generates an IP Address

for the corresponding WLAN/LAN interface if enabled.

The generated IP address is a unique Class B IP address

from the 169.254.X.Y range (Netmask 255.255.0.0) which is

intended for use within the same network segment only.

Auto IP always starts with 169.254.X.Y while X and Y are

last 2 digits from the MAC address of the device (i.e. if the

MAC is 00:15:6D:A3:04:FB, Generated unique Auto IP will

be 169.254.4.251).

IP Aliases IP aliases for the internal and external network

interface can be configured. IP Aliases can be specified

using the IP Aliases configuration window which is opened

when you click Configure.

• IP The alternative IP address for the LAN or WLAN

interface, which can be used for the routing or device

management purposes.

•

Netmask The network address space identifier for the

particular IP Alias.

•

Comment Field used for a brief description of the

purpose of the alias.

•

Enabled Enables or disables the particular IP Alias. All

added IP Aliases are saved in the system configuration

file, however only the enabled IP Aliases are active on

the AirRouter HP.

Newly-added IP Aliases can be saved by click the Save

button or discarded by clicking the Cancel button in the

Aliases configuration window.

Bridge > VLAN Network Settings

Enable VLAN Defines the size (in bytes) of the largest

protocol data unit the layer can pass on. When using

slow links, large packets can cause some delays thereby

increasing lag and latency.

VLAN ID The VLAN ID is a unique value assigned to

each VLAN at a single device; every VLAN ID represents

a different Virtual Network. In AirOS 5.3.3 VLAN ID range

values between 2 and 4094 are allowed. AirOS 5.3.3 only

allows for one VLAN ID per device.

VLAN Network Defines which network interface will be

assigned to the specified VLAN ID.

Bridge > Firewall Settings

Firewall functionality on the bridge interface can be

enabled by selecting Enable Firewall. Bridge Firewall

rules can be configured, enabled or disabled while using

Firewall configuration window which opens when you

click Configure.

Firewall entries can be specified by using the following

criteria:

Interface The interface (WLAN or LAN) where filtering of

the incoming/passing-through packets are processed.

IP Type Sets which particular L3 protocol type (IP, ICMP,

TCP, UDP) should be filtered.

Source IP/Mask The source IP of the packet (specified

within the packet header), usually it is the IP of the host

system which sends the packets.

Src Port 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 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.

Dst Port 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.

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