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Инструкция по эксплуатации Страница: 26

Ubiquiti AirRouter HP Инструкция по эксплуатации онлайн [26/61] 67420

Chapter 6: Network TabAirRouter

HP User Guide

Ubiquiti Networks, Inc.

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.

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 the local network while the

AirRouter HP is operating in Access Point or Access Point

WDS mode and in the reverse direction in Station and

Station WDS mode.

Enable NAT Protocol While NAT is enabled, data packets

could be modified in order to allow pass-through to the

Router. To avoid packet modification of some specific

packets, like: SIP, PPTP, FTP, RTSP; uncheck the respective

checkbox.

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 for the packets

to pass-through the AirRouter HP if NAT is disabled in

while operating in Router mode.

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.

Enable DHCP Server Dynamic Host Configuration

Protocol (DHCP) Server assigns IP addresses to clients

which will associate to the wireless interface while the

AirRouter HP is operating in Access Point or Access Point

WDS mode and assigns IP addresses to clients which will

connect to the LAN interface while the AirRouter HP is

operating in Station or 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.

• 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.

• 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 ensures client

operation without interruption, 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 acquires a new IP

addresses from the DHCP server. The time is expressed

in seconds.

Enable DNS Proxy The DNS Proxy forwards the Domain

Name System requests from the hosts which reside in the

internal network to the DNS server while the AirRouter HP

is in operating in Router mode. A valid Primary DNS Server

IP needs to be specified for DNS Proxy functionality. The

internal network interface IP of the AirRouter HP should

be specified as the DNS server in the host configuration in

order for the DNS Proxy to 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 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 the Port Forwarding

window, which is opened by enabling Port Forwarding

and then clicking Configure.

Port Forwarding entries can be specified by using the

following criteria:

•

Private IP The IP of the host which is connected to the

internal network and needs to be accessible from the

external network.

•

Private Port 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 The L3 protocol (IP) type which needs to be

forwarded from the internal network.

Ubiquiti AirRouter HP Инструкция по эксплуатации онлайн [26/61] 67420

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