D-Link DSR-250v2 Product Manual 1 - Page 52

Load Balancing, Ping IP address, Primary WAN, Secondary WAN, Retry interval, Failover after

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Primary WAN Secondary WAN Retry interval Failover after Ping IP address: If you select this option, ping to an IP address to detect WAN health. Select this option and enter the IP addresses in the fields to ping from the primary and secondary WANs. Ensure that this destination host is reliable. Enter the IP address whose health could be checked using the primary WAN port. Enter the IP address whose health could be checked using the secondary WAN port. Enter the retry time duration in seconds to check the WAN health. By default, it is every 30 seconds. Enter the number of failures after which the port is considered to be down. Load Balancing The load balancing feature allows you to simultaneously use multiple WAN links (presumably multiple ISP's). After configuring more than one WAN port, the load balancing option can carry traffic over more than one link. Protocol bindings are used to segregate and assign services over one WAN port to manage Internet flow. The configured failure detection method is used regularly on all the configured WAN ports when in Load Balancing mode. Load balancing is beneficial 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. The gateway currently supports two algorithms for Load Balancing: Round Robin: This algorithm works in a recurring process where the packets are routed to the available WAN ports in a sequence irrespective of the connection speed of any WAN ports. If one packet is forwarded to one WAN port, the next packet will automatically go to the next WAN port. This ensures that the traffic load is distributed among all the active WAN ports. Spillover: If the Spillover method is selected, one WAN acts as a dedicated link until a defined bandwidth threshold is reached. After this, the next WAN will be used for new connections. Inbound connections on WAN are permitted with this mode, as the spillover logic governs outbound connections moving from one WAN to the other WAN. You can configure spillover mode by using the following options: Load Tolerance: It is the percentage of bandwidth after which the gateway switches to secondary WAN. Max Bandwidth: This sets the maximum bandwidth tolerable by the primary WAN for outbound traffic. If the link bandwidth of outbound traffic goes above the max bandwidth load tolerance value, the gateway will spill over the next connections to the next WAN. For example, if the maximum bandwidth of a WAN is 1Kbps 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 70% of 1Kbps, the gateway will spill over new outbound connections to the next WAN. The maximum value of load tolerance is 80%, and the minimum is 20%. Round Robin Round robin is an algorithm for load-balancing and is useful when the traffic load is distributed among all the WAN ports. When you select Roundrobin as Load Balancing, configure the fields available on the page.

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Ping IP address
: If you select this option, ping to an IP address to detect WAN health.
Select this option and enter the IP addresses in the fields to ping from the primary and
secondary WANs. Ensure that this destination host is reliable.
Primary WAN
Enter the IP address whose health could be checked using the primary WAN port.
Secondary WAN
Enter the IP address whose health could be checked using the secondary WAN port.
Retry interval
Enter the retry time duration in seconds to check the WAN health. By default, it is every 30
seconds.
Failover after
Enter the number of failures after which the port is considered to be down.
Load Balancing
The load balancing feature allows you to simultaneously use multiple WAN links (presumably multiple ISP’s). After configuring more than one
WAN port, the load balancing option can carry traffic over more than one link. Protocol bindings are used to segregate and assign services over
one WAN port to manage Internet flow. The configured failure detection method is used regularly on all the configured WAN ports when in Load
Balancing mode.
Load balancing is beneficial 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.
The gateway currently supports two algorithms for Load Balancing:
Round Robin
: This algorithm works in a recurring process where the packets are routed to the available WAN ports in a sequence
irrespective of the connection speed of any WAN ports. If one packet is forwarded to one WAN port, the next packet will automatically go
to the next WAN port. This ensures that the traffic load is distributed among all the active WAN ports.
Spillover
: If the Spillover method is selected, one WAN acts as a dedicated link until a defined bandwidth threshold is reached. After
this, the next WAN will be used for new connections. Inbound connections on WAN are permitted with this mode, as the spillover logic
governs outbound connections moving from one WAN to the other WAN.
You can configure spillover mode by using the following options:
Load Tolerance
: It is the percentage of bandwidth after which the gateway switches to secondary WAN.
Max Bandwidth
: This sets the maximum bandwidth tolerable by the primary WAN for outbound traffic.
If the link bandwidth of outbound traffic goes above the max bandwidth load tolerance value, the gateway will spill over the next
connections to the next WAN.
For example, if the maximum bandwidth of a WAN is 1Kbps 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 70% of 1Kbps, the gateway will spill over new outbound connections to the next
WAN. The maximum value of load tolerance is 80%, and the minimum is 20%.
Round Robin
Round robin is an algorithm for load-balancing and is useful when the traffic load is distributed among all the WAN ports. When you select
Round-
as Load Balancing, configure the fields available on the page.
robin