Ubiquiti AirRouterHP User Manual Download Page 24

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Chapter 6: Network Tab

AirRouter

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.

•

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