Ubiquiti Networks Rockeac - Manual (Page 25)

22
Chapter 4: Network airOS®7 User Guide
Ubiquiti Networks, Inc.
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 device.
For example, if the MAC is 00:15:6D:A3:04:FB, then the
generated unique Auto IP will be 169.254.4.251.
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.
MAC Address Cloning When enabled, you can change
the MAC address of the respective interface. This is
especially useful if your ISP only assigns one valid IP
address and it is associated to a specific MAC address. This
is usually used by cable operators or some WISPs.
•
MAC Address Enter the MAC address you want to clone
to the respective interface. This becomes the new MAC
address of the interface.
LAN Network Settings
(Available in Router mode only)
LAN Interface In Simple view, the interface is displayed.
Select the interface used for LAN connection. In Advanced
view, click Del to remove the interface. If there is no
interface selected, select an interface from the Add LAN
drop-down list, and click Add.
IP Address The IP address of the LAN interface. In case
the LAN interface is the bridge, all the bridge ports (i.e.,
Ethernet and WLAN interfaces) will be considered as local
network interfaces. This IP will be used for routing of the
local network; it will be the gateway IP for all the devices
on the local network. This IP address can be used for
management of the device.
Netmask Defines 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 the IP address range
of 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 identify the host. The netmask is used to
identify the subnet to which an IP address belongs.
MTU (Available in Simple view.) The Maximum
Transmission Unit (MTU) is the maximum frame size (in
bytes) that a network interface can transmit or receive. The
default is 1500.
DHCP Server The built-in DHCP server assigns IP
addresses to clients connected to the LAN interface.
•
Disabled The device does not assign local IP addresses.
• Enabled The device assigns IP addresses to client
devices on the local network.
- Range Start and End Determines the range of IP
addresses assigned by the DHCP server.
- Netmask Defines 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
an IP address range of 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. The netmask is used to identify the
subnet to which an IP address belongs.
- Lease Time Defines the duration for which IP
addresses assigned by the DHCP server are valid.
Increasing the time ensures client operation without
interruption, but could introduce potential conflicts.
Decreasing the lease time avoids potential address
conflicts, but might cause more slight interruptions to
the client while it acquires a new IP address from the
DHCP server. The time is expressed in seconds.
- DNS Proxy If this option is enabled, the device (LAN
port) will act as the Domain Name System (DNS) proxy
server, and will forward DNS requests from hosts on
the local network to the real DNS server. This option is
enabled by default. If disabled, specify the following:
• Primary DNS Enter the IP address of the primary
DNS server.
• Secondary DNS Enter the IP address of the
secondary DNS server.
• Relay Relays DHCP messages between DHCP clients
and DHCP servers on different IP networks.