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Page 51 / 270 Scroll up to view Page 46 - 50
Unified Services Router
User Manual
49
Figure 28: Traffic Se le ctor Configuratio n
3.4
Features with Multiple WAN Links
This router supports multiple WAN links . This allows you to take advantage of
failover and load balancing features to ensure certain internet dependent services are
prioritized in the event of unstable WAN connectivity on one of the ports.
Setup > Internet Settings > WAN Mode
To use Auto Failover or Load Balancing, WAN link failure detection must be
configured. This involves accessing DNS servers on the internet or ping to an internet
address (user defined). If required, you can configure the number of retry attempts
when the link seems to be d isconnected or the threshold of failures that determines if
a WAN port is down.
3.4.1 Auto Failover
In this case one of your WAN ports is assigned as the primary internet link for all
internet traffic. The secondary WAN port is used for redundancy in case the primary
link goes down for any reason. Both WAN ports (primary and secondary) must be
configured to connect to the respective ISP’s before enabling this feature.
The
secondary WAN port will remain unconnected until a failure is detected on the
primary link (either port can be assigned as the primary). In the event of a failure on
the primary port, all internet traffic will be rolled over to the backup port. When
configured in Auto Failover mode, the link status of the primary WAN port is
checked at regular intervals as defined by the failure detection settings.
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Unified Services Router
User Manual
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Note that both WAN1, WAN2 and WAN3 can be configured as the primary internet
link.
Auto-Rollover using WAN port
Primary WAN:
Selected WAN is the primary link (WAN1/WAN2/WAN3)
Secondary WAN: Selected WAN is the secondary link.
Failover Detection Settings: To check connectivity of the primary internet link, one
of the following failure detection methods can be selected:
DNS lookup using WAN DNS Servers: DNS Lookup of the DNS Servers of
the primary link are used to detect primary WAN connectivity.
DNS lookup using DNS Servers: DNS Lookup of the custom DNS Servers
can be specified to check the connectivity of the primary link.
Ping these IP addresses: These IP's will be pinged at regular intervals to
check the connectivity of the primary link.
Retry Interval is: The number tells the router how often it should run the
above configured failure detection method.
Failover after: This sets the number of retries after which failover is
initiated.
3.4.2 Load Balancing
This feature allows you to use multiple WAN links (and presumably multiple ISP’s)
simultaneously. After configuring more than one WAN port, the load balancing
option is available to carry traffic over more than one link. Protocol bindings are
used to segregate and assign services over one WAN port in order to manage
internet flow. The configured failure detection method is used at regular intervals on
all configured WAN ports when in Load Balancing mode.
DSR currently support three algorithms for Load Balancing:
Round Robin
: This algorithm is particularly useful when the connection speed of
one WAN port greatly differs from another. In this case you can define protocol
bindings to route low-latency services (such as VOIP) over the higher-speed link
and let low-volume background traffic (such as SMTP) go over the lower speed link.
Protocol binding is explained in next section.
Spill Over
: If Spill Over method is selected, WAN1 acts as a dedicated link till a
threshold is reached. After this, WAN2 will be use d for new connections. You can
configure spill-over mode by using following options:
Load Tolerance: It is the percentage of bandwidth after which the router
switches to secondary WAN.
Max Bandwidth: This sets the maximum bandwidth tolerable by the primary
WAN.
If the link bandwidth goes above the load tolerance value of max bandwidth, the
router will spill-over the next connections to secondary WAN.
For example, if the maximum bandwidth of primary WAN is 1 Kbps and the load
tolerance is set to 70. Now every time a new connection is established the
bandwidth increases. After a certain number of connections say bandwidth reached
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Unified Services Router
User Manual
51
70% of 1Kbps, the new connections will be spilled -over to secondary WAN. The
maximum value of load tolerance is 80 and the least is 20.
Protocol Bindings
: Refer Section 3.4.3 for details
Load balancing is particularly useful when the connection speed of one WAN port
greatly differs from another. In this case you can define protocol bindings to route
low-latency services (such as VOIP) over the higher-speed link and let low-volume
background traffic (such as SMTP) go over the lower speed link.
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Unified Services Router
User Manual
52
Figure 29: Load Balancing is available whe n multiple WAN ports are
configure d and Protocol Bindings have be e n de fine d
3.4.3 Protocol Bindings
Advanced > Routing > Protocol Bindings
Protocol bindings are required when the Load Balancing feature is in use. Choosing
from a list of configured services or any of the user-defined services , the type of
traffic can be assigned to go over only one of the available WAN ports. For
increased flexibility the source network or machines can be specified as well as the
destination network or machines. For example the VOIP traffic for a set of LAN IP
addresses can be assigned to one WAN and any VOIP traffic from the remaining IP
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Unified Services Router
User Manual
53
addresses can be assigned to the other WAN link. Protocol bindings are only
applicable when load balancing mode is enabled and mor e than one WAN is
configured.
Figure 30: Protocol binding se tup to associate a se rvice and/or LAN
source to a WAN and/or de stination ne twork
3.5 Routing Configuration
Routing between the LAN and WAN will impact the way this router handles traffic
that is received on any of its physical interfaces. The routing mode of the gateway is
core to the behaviour of the traffic flow between the secure LAN and the internet.
3.5.1 Routing Mode
Setup > Internet Settings > Routing Mode
This device supports classical routing, network address translation (NAT), and
transport mode routing.
With classical routing, devices on the LAN can be directly accessed from the
internet by their public IP addresses (assuming appropriate firewall settings). If
your ISP has assigned an IP address for each of the computers that you use,
select Classic Routing.

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