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Ubiquiti Networks, Inc.
Chapter 3: AirOS™
AirRouter User Guide
Static
IP Address and Netmask settings should be consistent
with the address space of the network segment where
the AirRouter resides. If the IP of the AirRouter and the IP
of the administrator PC use a different address space, the
AirRouter will become unreachable. (Applicable for Static
mode only)
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.
(Applicable for Static mode only)
Gateway IP
The IP address of the host router which
resides on the external network and provides the point
of connection to the next hop towards the Internet. This
can be a DSL modem, Cable modem, or a WISP gateway
router. The AirRouter will direct all the packets to the
gateway if the destination host is not within the local
network. (Applicable for Static mode only)
The Gateway IP address should be from the same address
space (on the same network segment) as the AirRouter’s
external network interface (Wireless interface in the
Station or Station WDS mode and the LAN interface in
Access Point or Access Point WDS mode). (Applicable for
Static mode only)
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.
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.
•
Comments
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.
Newly 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
In SOHO (Small Office/Home Office) Router mode, the
main Ethernet port becomes the WAN port, and the WLAN
(Wireless LAN) and other LAN ports become the local
network (LAN).
SOHO router mode only works properly in Access Point or
Access Point‑WDS mode, since it has not been designed to
act as a wireless client.
Summary of Contents for AirRouter
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