Inscape Data AirEther BR3000 Series, Руководство пользователя

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SB3000 & BR3000 Series User
’
s Manual
`
Rev. 1.1 (July, 2012) 100
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 device.
Primary DNS server IP is mandatory. It is used by the DNS Proxy and for the device management
purpose.
Secondary DNS server IP address is optional. It is used as the fail-over in case the primary DNS server
will become unresponsive.
Enable NAT:
Network Address Translation (NAT) enables packets to be sent from the wired network
(LAN) to the wireless interface IP address and then sub-routed to other client devices residing on it's local
network while the device is operating in AP/AP WDS wireless mode and in the contrariwise direction in
"Station/Station WDS" mode.
NAT is implemented using the masquerade type firewall rules. NAT firewall entries are stored in the
iptables nat table, while the device is operating in Router mode. Please refer to the iptables tutorial for
detailed description of the NAT functionality in Router mode.
Static routes should be specified in order the packets should pass-through the based device if the
NAT is disabled in while operating in Router network mode.
Enable DHCP Server:
Dynamic Host Configuration Protocol (DHCP) Server assigns IP addresses to
clients which will associate to the wireless interface while the device is operating in
AP/AP WDS wireless mode and assigns IP addresses to clients which will connect to the LAN interface
while the device is operating in Station/Station WDS mode.
Range Start/End:
This range determines the IP addresses given out by the DHCP server to client
devices on the internal network which use dynamic IP configuration.
Lease Time: The IP addresses given out by the DHCP server will only be valid for the duration specified
by the lease time. Increasing the time ensure client operation without interrupt, but could introduce
potential conflicts. Lowering the lease time will avoid potential address conflicts, but might cause more
slight interruptions to the client while it will acquire new IP addresses from the DHCP server.
DHCP Fallback IP : In case the external network interface of the 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. In case the IP settings of the device are unknown, they can be retrieved with the
help of the UConfig utility and should be started on the administrator PC which resides on the same
network segment as the device.
11.2 Port Forwarding Settings
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 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 which 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 which 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.