Ubiquiti airFiber 11FX, User Manual

26

Chapter 6: Network Tab 

airFiber AF-11FX User Guide

Ubiquiti Networks, Inc.

Note:

 IP settings should be consistent with the 

address space of the airFiber X radio’s network 

segment.

 -

IP Address 

Specify the IP address of the airFiber X 

radio. This IP will be used for device management 
purposes.

 -

Netmask 

When the netmask is expanded into its 

binary form, it provides a mapping to define which 
portions of the IP address range are used for the 
network devices and which portions are used for host 
devices. The netmask defines the address space of the 

airFiber X radio’s network segment. The 255.255.255.0 

(or “/24”) netmask is commonly used on many Class C 
IP networks.

 -

Gateway IP 

Typically, this is the IP address of the host 

router, which provides the point of connection to the 
Internet. This can be a DSL modem, cable modem, or 

WISP gateway router. The airFiber X radio directs data 

packets to the gateway if the destination host is not 
within the local network.

 -

Primary DNS IP 

Specify the IP address of the primary 

DNS (Domain Name System) server.

 -

Secondary DNS IP 

Specify the IP address of the 

secondary DNS server. This entry is optional and used 
only if the primary DNS server is not responding.

Management VLAN 

If enabled, automatically creates a 

management Virtual Local Area Network (VLAN). 
• 

VLAN ID 

Enter a unique VLAN ID from 2 to 4094. 

Auto IP Aliasing 

If enabled, automatically generates an 

IP address for the corresponding WLAN/LAN interface. 

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. The Auto IP always starts with 169.254.X.Y, with X 

and Y as the last two octets from the MAC address of 

the airFiber X radio. For example, if the MAC address is 
00:15:6D:A3:04:FB, then the generated unique Auto IP will 
be 169.254.4.251. (The hexadecimal value, FB

, converts to 

the decimal value, 251

.)

The Auto IP Aliasing setting can be useful because you 
can still access and manage devices even if you lose, 

misconfigure, or forget their IP addresses. Because an 

Auto IP address is based on the last two octets of the MAC 
address, you can determine the IP address of a device if 
you know its MAC address.

airView Port 

The port number associated with the 

airView spectrum analyzer tool. The default value is 

18888

. 

For detailed information on the airView tool, refer to 

“airView” on page 38

.

Mgmt Speed 

This is the speed of the 

Management

port. By default, the option is Auto. The airFiber X radio 

automatically negotiates transmission parameters, such as 
speed and duplex, with its counterpart. In this process, the 
networked devices first share their capabilities and then 
choose the fastest transmission mode they both support.
To manually specify the maximum transmission link 
speed and duplex mode, select one of the following 
options: 

100 Mbps-Full

, 

100 Mbps-Half

, 

10 Mbps-Full

, 

or 

10 Mbps-Half. 

If you are running extra long Ethernet 

cables, a link speed of 

10 Mbps could help to achieve 

better stability.
Full-duplex mode allows communication in both 
directions simultaneously. Half-duplex mode allows 
communication in one direction at a time, alternating 
between transmission and reception.

Data Port Ethernet Settings

DATA Speed 

This is the speed of the 

Data

 port. 

The default is Auto

, which

allows the radio to operate 

at a speed of 1 Gbps. The airFiber X radio automatically 

negotiates transmission parameters, such as speed and 
duplex, with its counterpart. In this process, the networked 
devices first share their capabilities and then choose the 
fastest transmission mode they both support.
To manually specify the maximum transmission link 
speed and duplex mode, select one of the following 
options: 

100 Mbps-Full

, 

100 Mbps-Half

, 

10 Mbps-Full

, or 

10 Mbps-Half

. 

Full-duplex mode allows communication in both 
directions simultaneously. Half-duplex mode allows 
communication in one direction at a time, alternating 
between transmission and reception.

Flow Control 

If enabled, the airFiber X radio generates 

and responds to Ethernet layer PAUSE frames. The 

airFiber X radio regulates inbound traffic from the 
customer’s network to avoid buffer overflows within the 
airFiber X radio. Flow control has the effect of controlling 

the inter-packet spacing of packets headed into the 
airFiber Data interface.

Multicast Filter 

If enabled, the filter blocks multicast 

traffic from overloading the CPU when in-band 

management is enabled. This allows the airFiber X radio 
to be managed in-band when the customer’s network is 

carrying large volumes of multicast traffic, such as IPTV. 
The filter does not block multicast traffic going over the 

radio; it simply blocks it from reaching the airFiber X 
radio’s management interface CPU.