Ubiquiti Networks airRouter HP User's Guide download pdf (Page 35)

Chapter 6: Network TabAirRouter

HP User Guide

Ubiquiti Networks, Inc.

• 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.

Change MAC Address When enabled, the MAC address

of the respective interface can be changed. This is

especially useful if your ISP only assigns one valid IP

address and it is associated to a specific MAC address;

usually used by Cable operators or some WISPs.

SOHO Router > LAN Network

Settings

IP Address This is the IP address to be represented by

the LAN (including WLAN) interface which is connected

to the internal network. This IP will be used for the routing

of the internal network (it will be the Gateway IP for all

the devices connected on the internal network). This IP

address is used for the management of the AirRouter HP.

Netmask This is used to define the device IP classification

for the chosen IP address range. 255.255.255.0 is a typical

netmask value for Class C networks, which support

IP address range 192.0.0.x to 223.255.255.x. A Class C

network Netmask uses 24 bits to identify the network

(alternative notation “/24”) and 8 bits to identity the host.

Enable NAT Network Address Translation (NAT) enables

packets to be sent from the external network (WAN) to the

local interface IP address and then sub-routed to other

client devices residing on the local network while the

AirRouter HP is operating in Access Point or Access Point

WDS wireless mode.

Enable NAT Protocol While NAT is enabled, data packets

could be modified in order to allow pass-through to the

Router. To avoid packet modification of some specific

packets, like: SIP, PPTP, FTP, RTSP; uncheck the respective

checkbox.

NAT is implemented using the masquerade type firewall

rules. NAT firewall entries are stored in the iptables nat

table, while the device is operating in Router mode. Please

refer to the iptables tutorial for detailed description of the

NAT functionality in Router mode.

Static routes should be specified in order for the packets

to pass-through the AirRouter HP if NAT is disabled while

operating in SOHO Router network mode.

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.

Enable DHCP Server Dynamic Host Configuration

Protocol (DHCP) Server assigns IP addresses to clients

connected to the wireless interface and LAN interface

while the AirRouter HP is operating in Access Point or

Access Point WDS wireless mode. IP addresses are assigned

to clients that connect to the LAN interface while the

AirRouter HP is operating in Station or Station WDS mode.

•

Range Start/End This range determines the IP

addresses given out by the DHCP server to client

devices on the internal network which use dynamic IP

configuration.

•

Netmask This is used to define the device IP

classification for the chosen IP address range.

255.255.255.0 is a typical netmask value for Class C

networks, which support IP address range 192.0.0.x to

223.255.255.x. A Class C network Netmask uses 24 bits

to identify the network (alternative notation “/24”) and 8

bits to identity the host.

• Lease Time The IP addresses given out by the DHCP

server will only be valid for the duration specified

by the lease time. Increasing the time ensures client

operation without interruption, but could introduce

potential conflicts. Lowering the lease time will avoid

potential address conflicts, but might cause more slight

interruptions to the client while it will acquire new IP

addresses from the DHCP server. The time is expressed

in seconds.

Enable DNS Proxy The DNS Proxy forwards the Domain

Name System requests from the hosts which reside in the

internal network to the DNS server while AirRouter HP

is operating in SOHO Router mode. A valid Primary DNS

Server IP needs to be specified for DNS Proxy functionality.

TheinternalnetworkinterfaceIPoftheAirRouterHP

should be specified as the DNS server in the host

configuration in order for the DNS Proxy to be able to get

DNS requests and translate domain names to IP addresses

afterwards.

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