DNS Proxy and Port Forwarding settings
Port Forwarding example
IP Aliases
Enable DNS Proxy: The DNS Proxy forwards the Domain Name System requests from the
hosts that reside in the internal network to the DNS server while AirOS powered device is in
operating in Router mode. Valid Primary DNS Server IP needs to be specified for DNS Proxy
functionality. Internal network interface IP of the AirOS powered device should be specified as
the DNS server in the host configuration in order DNS Proxy should be able to get the DNS
requests and translate domain names to IP addresses afterwards.
Port Forwarding: Port forwarding allows specific ports of the hosts residing in the internal network to be forwarded to the external
network. This is useful for a number of applications such as FTP servers, gaming, etc. where different host systems need to be seen using
a single common IP address/port.
Port Forwarding rules can be set in Port Forwarding window, which is opened by
enabling the Port Forwarding option and activating the Configure button.
Port Forwarding entries can be specified by using the following criteria:
Private IP is the IP of the host that is connected to the internal network and
needs to be accessible from the external network;
Private Port is the TCP/UDP port of the application running on the host that
is connected to the internal network. The specified port will be accessible
from the external network;
Type is the L3 protocol (IP) type which needs to be forwarded from the
internal network.
Public Port is the TCP/UDP port of the AirOS v5.3 based device which will
accept and forward the connections from the external network to the host
connected to the internal network.
Comments is the informal field for the comment of the particular port
forwarding entry. Few words about the particular port forwarding entry
purpose are saved there usually.
Enabled flag enables or disables the effect of the particular port forwarding entry. All the added firewall entries are saved in the
system configuration file. However, only the enabled port forwarding entries will be active during the AirOS system operation.
Newly added port forwarding entries can be saved by activating Save button or discarded by activating Cancel button in the Port
Forwarding configuration window.
Auto IP Aliasing configures automatically generated IP Address for the corresponding WLAN/LAN interface if enabled. Generated IP
address is the unique Class B IP address from the 169.254.X.Y (http://en.wikipedia.org/wiki/Link-local_address) range (Netmask
255.255.0.0) which 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 (i.e. if the MAC is 00:15:6D:A3:04:FB, Generated unique Auto IP will be 169.254.4.251).
IP Aliases for internal and external network interface can be configured. IP
Aliases can be specified using the IP Aliases configuration window that is opened
while activating the "Configure" button.
IP Address is the alternative IP address for the LAN or WLAN interface,
which can be used for the routing or device management purposes;
Netmask is the network address space identifier for the particular IP Alias;
Comments is the informal field for the comment of the particular IP Alias.
Few words about the alias purpose are saved there usually;
Enabled flag enables or disables the particular IP Alias. All the added IP
Aliases are saved in the system configuration file. However, only the enabled
IP Aliases will be active during the AirOS system operation.
Newly added IP Aliases can be saved by activating Save button or discarded by
activating Cancel button in the Aliases configuration window.
LAN Network Settings
LAN IP Address: This is the IP addresses to be represented by the LAN or WLAN interface that is connected to the external network
according to the wireless operation mode described above. This is the IP address can be used for the routing and the device management
purposes.
The external network interface can be set for static IP or can be set to obtain an IP address from the DHCP server, which should reside in
the external network. One of the IP assignment modes must be selected for the external network interface:
DHCP – choose this option to obtain the IP address, Gateway and DNS address dynamically from the external DHCP server.
PPPoE – choose this option to obtain the IP address, Gateway and DNS address dynamically from the external PPPoE server.
Static – choose this option to assign the static IP settings for the external interface.
AirOS 5.3 - Ubiquiti Wiki
http://www.ubnt.com/wiki/AirOS_5.3
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