Справочник Пользователя для D-Link DSR-1000
Unified Services Router
User Manual
42
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:
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.
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.
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.
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.
above configured failure detection method.
Failover after: This sets the number of retries after which failover is
initiated.
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.
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.
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 used for new connections. You can
configure spill-over mode by using folloing options:
threshold is reached. After this, WAN2 will be used for new connections. You can
configure spill-over mode by using folloing options:
Load Tolerance: It is the percentage of bandwidth after which the router
switches to secondary WAN.
switches to secondary WAN.
Max Bandwidth: This sets the maximum bandwidth tolerable by the primary
WAN.
WAN.
If the link bandwidth goes above the lo ad tolerance value of max bandwidth, the
router will spill-over the next connections to secondary WAN.
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
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.
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 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