Ubiquiti Networks PowerBridgM - Manual (Page 34)

31
Chapter 5: Network Tab airOS ™ v5.5.4 User Guide
Ubiquiti Networks, Inc.
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.
• Actual 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.
Action You have the following options:
• Add Add a rule.
• Edit Make changes to a traffic shaping rule. Click Save
to save your changes.
• Del Deletes a traffic shaping rule.
Router
In Router mode, the device operates in Layer 3 to perform
routing and enable network segmentation – wireless
clients are on a different IP subnet. Router mode blocks
broadcasts and can pass through multicast packet traffic.
You can configure additional firewall settings for Layer 3
packet filtering and access control.
The device can act as a DHCP server and use Network
Address Translation (Masquerading), which is widely used
by APs. NAT acts as the firewall between the LAN and
WAN.
In Router mode, the WLAN functions as the Wide Area
Network (WAN). The Ethernet ports function as the LAN.
Each wireless or wired interface on the WAN or LAN has
an IP address. For example, the following diagram shows
the NanoStation at a residence wirelessly connecting to a
WISP tower.
NanoStation
WISP Tower