Instruction Manual

39
Chapter 5: Network Tab airOS
™
v5.5.4 User Guide
Ubiquiti Networks, Inc.
Type The Layer 3 protocol (IP) type that needs to be
forwarded from the local network.
Source IP/mask The IP address and netmask of the
source device.
Public IP/mask The public IP address and netmask of the
device that will accept and forward the connections from
the external network to the local host.
Public Port The TCP or UDP port of the device that will
accept and forward the connections from the external
network to the local host.
Comment Enter a brief description of the port
forwarding functionality, such as FTP server, web server, or
game server.
Action You have the following options:
• Add Add a port forwarding rule.
• Edit Make changes to a port forwarding rule. Click Save
to save your changes.
• Del Delete a port forwarding rule.
Multicast Routing Settings
With a multicast design, applications can send one copy
of each packet and address it to a group of computers
that want to receive it. This technique addresses packets
to a group of receivers rather than to a single receiver. It
relies on the network to forward the packets to the hosts
that need to receive them. Common routers isolate all the
broadcast (thus multicast) traffic between the local and
external networks; however, the device provides multicast
traffic pass-through functionality.
Multicast Routing Enables multicast packet pass-through
between local and external networks while the device is
operating in Router mode. Multicast intercommunication
is based on Internet Group Management Protocol (IGMP).
Multicast Upstream Specify the source of multicast
traffic.
Multicast Downstream Specify the destination(s) of
multicast traffic.
Add Add a destination.
Del Delete a destination.
Traffic Shaping
(Available in Advanced view.) Traffic Shaping controls
bandwidth from the perspective of the client (who is
connected on the Ethernet interface). Bursting allows
fast downloads when a user downloads small files (for
example, viewing different pages of a website), but
prevents a user from using excessive bandwidth when
downloading large files (for example, streaming a movie).
As Layer 3 QoS, you can limit the traffic at the device at the
port level, based on a rate limit you define. Each port has
two types of traffic:
• Ingress traffic entering the port
• Egress traffic exiting the port
We recommend using Traffic Shaping to control egress
traffic, because it is more efficient in the egress direction.
When a port accepts ingress traffic, it cannot control how
quickly the traffic arrives – the sending device controls
that traffic. However, when a port sends out egress traffic,
it can control how quickly the traffic exits.
Bursting allows the bandwidth to spike higher than the
maximum bandwidth you configure in the Ingress and
Egress Rate settings – for a short period of time. Once the
Ingress or Egress Burst (volume of data) is used up, the
throughput drops back down to the corresponding Ingress
or Egress Rate setting (maximum bandwidth) you have set.
For example, you have the following conditions:
• Ingress Burst is set to 2048 kBytes.
• Ingress Rate is set to 512 kbit/s.
• Maximum bandwidth is 1024 kbit/s.
Bursting allows 2048 kBytes to pass at 1024 kbit/s before
throttling down to 512 kbit/s.
Enable Enables bandwidth control on the device.
Enabled Enables the specific rule. All the added rules are
saved in the system configuration file; however, only the
enabled rules are active on the device.
Interface Select the appropriate interface.
Ingress
• Enable Enables the ingress values.
• Rate, kbit/s Specify the maximum bandwidth value (in
kilobits per second) for traffic passing from the wireless
interface to the Ethernet interface.
• Burst, kBytes Specify the data volume (in kilobytes)
that is allowed before the ingress maximum bandwidth
applies.
Egress
• Enable Enables the egress values.
• Rate, kbit/s Specify the maximum bandwidth value (in
kilobits per second) for traffic passing from the Ethernet
interface to the wireless interface.
• Burst, kBytes Specify the data volume (in kilobytes)
that is allowed before the egress maximum bandwidth
applies.