ARP table
Monitor - Routes
Monitor - Firewall
Monitor - Port forwarding
DHCP leases
Gateway: displays the device’s gateway when operating in DHCP Client mode, which is assigned automatically by the DHCP server
(not the device’s DHCP server).
Primary/Secondary DNS IP: Domain Name System (DNS) is an Internet "phone book" which translates domain names to IP
addresses. These fields identify the server IP addresses of where the AirOS device looks for the translation source.
DHCP Server: displays the IP address of the DHCP Server assigning the device’s WAN IP Address.
Total Lease Time: shows the total time (validity) of the leased IP address assigned by the external DHCP server.
Remaining Lease Time: displays the remaining time of the IP address leased by the external DHCP server.
ARP Table: selection lists all the entries of the ARP (Address Resolution
Protocol) table currently recorded on the device.
The list can be updated using the Refresh button.
ARP is used to associate each IP address to the unique hardware address
(MAC) the devices. It is important to have unique IP addresses for each MAC
or else there will be ambiguous routes in the network.
Bridge Table: selection lists all the entries in the system bridge table, while the
device is operating in Bridge mode.
The list can be updated using the Refresh button.
Bridge table shows to which bridge port the particular station is associated to - in other words, from which interface (Ethernet or
wireless ) the network device (defined by MAC address) is reachable to AirOS system while forwarding the packets to that port only
(thus saving a lot of redundant copies and transmits).
Ageing timer shows ageing time for each address entry (in seconds) - after particular time out, not having seen a packet coming from
a certain address, the bridge will delete that address from the Bridge Table.
Routes: selection lists all the entries in the system routing table, while the
device is operating in Router mode.
The list can be updated using the Refresh button.
AirOS examines the destination IP address of each data packet traveling
through the system and chooses the appropriate interface to forward the
packet to. The system choice depends on static routing rules – entries, which
are registered in the system routing table. Static routes to specific hosts,
networks or default gateway are set up automatically according to the IP configuration of all the AirOS interfaces.
AirOS IP configuration description is provided in the Wireless section.
Firewall: selection lists active firewall entries in the FIREWALL chain of the
standard ebtables (http://ebtables.sourceforge.net/ebtables-man.html) filter
table, while the device is operating in Bridge mode.
The list can be updated using the 'Refresh button.
Active firewall entries in the FIREWALL chain of the standard iptables
(http://security.maruhn.com/iptables-manual.html) filter table are listed if
the device is operating in Router mode.
The list can be updated using the Refresh button.
IP and MAC level access control and packet filtering in AirOS is implemented using iptables (http://security.maruhn.com/iptables-
manual.html) (routing) and ebtables (http://ebtables.sourceforge.net/ebtables-man.html) (bridging) firewall that protects the
resources of a private network from outside threats by preventing unauthorized access and filtering specified types of network
communication.
More information is provided in the Wireless section.
Port Forward: selection lists active port forward entries in the PORTFORWARD
chain of the standard iptables (http://security.maruhn.com/iptables-
manual.html) nat table, while the device is operating in Router mode.
The list can be updated using the Refresh button.
Port Forwarding creates a transparent tunnel through a firewall/NAT,
granting an access from the WAN side to the particular network service
running on the LAN side.
DHCP Leases: selection shows the current status of the leased IP addresses by
the device’s DHCP server. This option is available if DHCP Server is enabled while
the device is operating in Router mode.
MAC address shows the client’s MAC address, which is connected to the
Access Point.
IP address shows the client’s IP address leased by the device’s DHCP server.
Remaining Lease time shows for how long the leased IP address will be valid and reserved for particular DHCP client.
Hostname: displays the device name (hostname) of the client receiving an IP lease.
Interface name shows from which device the interface DHCP client specifying MAC Address is connected.
The list can be updated using the Refresh button.
AirOS 5.3 - Ubiquiti Wiki
http://www.ubnt.com/wiki/AirOS_5.3
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