Ubiquiti airFiber 24, User Manual

34

Chapter 6: Network Tab 

airFiber AF-24/AF-24HD User Guide

Ubiquiti Networks, Inc.

 -

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 AF-24’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 AF-24 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 

(Available if 

Management VLAN

 is enabled.) 

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 AF-24. 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 47

.

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 AF-24 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 AF-24 radio generates and 

responds to Ethernet layer PAUSE frames. The AF-24 radio 
regulates inbound traffic from the customer’s network to 
avoid buffer overflows within the AF-24 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 AF-24 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 AF-24 radio’s 
management interface CPU.

Ethernet Carrier Drop Settings

The 

Ethernet Carrrier Drop

 settings are used to control 

failover switching between the primary and backup link in 
response to capacity loss due to rain.

Carrier Drop Operation 

This setting is used to control 

the 

Ethernet Carrier Drop

 feature. Settings are: 

Disabled

, 

Enabled

, and 

Use Pulse

. The default is 

Disabled

.

Use Pulse

 and 

Enabled

 are the two different methods used 

to signal to the failover mechanism that it should switch to 
the backup link: