WAN IP Address assigned manually - Static
PPPoE Internet connection (usually used by ADSL providers)
WAN IP Address assigned via DHCP with IP fallback
Static – choose this option to assign the static IP settings for the external interface.
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. Class C network
Netmask uses 24 bits to identify the network (alternative notation "/24") and 8
bits to identity the host.
Gateway IP: is the IP address of the host router that 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.
AirOS v5.3 device will direct all the packets to the gateway if the destination
host is not within the local network.
Primary/Secondary DNS IP: The Domain Name System (DNS) is an internet
"phone book", which translates domain names to IP addresses. These fields
identify the server IP addresses where the DNS requests are forwarded by the
AirOS powered device.
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
PPPoE: Point-to-Point Protocol over Ethernet (PPPoE) is a virtual private and
secure connection between two systems that enables encapsulated data
transport. It is commonly used as the medium for subscribers to connect to
Internet Service Providers (ISP).
Select the IP Address option PPPoE to configure a PPPoE tunnel in order to
connect to an ISP. Only the WAN interface can be configured as PPPoE client as
all the traffic will be sent via this tunnel. The IP address, Default gateway IP and
DNS server IP address will be obtained from the PPPoE server after PPPoE
connection is established. Broadcast address is used for the PPPoE server
discovery and tunnel establishment.
Valid authorization credentials are required for the PPPoE connection:
PPPoE Username – username to connect to the server (must match the
configured on the PPPoE server);
PPPoE Password – password to connect to the server (must match the configured on the PPPoE server);
Show: Check this box to display the PPPoE password characters.
PPPoE MTU/MRU – the size (in bytes) of the Maximum Transmission Unit (MTU (http://en.wikipedia.org
/wiki/Maximum_transmission_unit) ) and Maximum Receive Unit (MRU) used for the data encapsulation while transferring it through
the PPP (http://tools.ietf.org/html/rfc1661) tunnel; (MTU/MRU default value: 1492)
PPPoE Encryption – enables the use of MPPE encryption.
IP address of the PPP interface will be displayed in the Main page next to the PPP interface statistics if it is obtained through the
established PPPoE connection, otherwise "Not Connected" message will be displayed.
PPPoE tunnel reconnection routine can be initiated using the Reconnect button, which is located in the Main page next to the PPP interface
statistics.
Enable DMZ: The Demilitarized Zone (DMZ) can be enabled and used as a place where services can be placed such as Web Servers,
Proxy Servers, and E-mail Servers such that these services can still serve the local network and are at the same time isolated from it for
additional security. DMZ is commonly used with the NAT functionality as an alternative for the Port Forwarding while makes all the ports
of the host network device be visible from the external network side.
DMZ Management Port: Web Management Port for the AirOS v5.3 based device (TCP/IP port 80 by default) will be used for the host
device if DMZ Management Port option is enabled. In this case AirOS device will respond to the requests from the external network as
if it was the host that is specified with DMZ IP. It is recommended to leave Management Port disabled while the AirOS based device
will become inaccessible from the external network if enabled.
DMZ IP: connected to the internal network host, specified with the DMZ IP address will be accessible from the external network.
DHCP Fallback IP: In case the WAN interface of the SOHO Router is placed in
Dynamic IP Address mode (DHCP) and is unable to obtain an IP address from a
valid DHCP server, it will fall back to the static IP address listed here.
DHCP Fallback Netmask: In case the Router is placed in Dynamic IP Address
mode (DHCP) and unable to obtain an IP address from a valid DHCP server, it
will fall back to the static Netmask listed here.
Auto IP Aliasing: configures automatically generated IP Address for the
corresponding WAN/WLAN-LAN interface if enabled. Generated IP address is the
unique Class B IP address from the 169.254.X.Y range (Netmask 255.255.0.0)
that are 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 device MAC address
AirOS 5.3 - Ubiquiti Wiki
http://www.ubnt.com/wiki/AirOS_5.3
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