Install guide

1-8 Release Note
Software Version 2.7.5
C613-10454-00 REV A
The following figure illustrates the adaptive bandwidth Detection - Weight
Calculation process
Healthchecks
By default, the WAN load balancer is only able to detect network malfunctions
as far as the first remote connection from its wide area ports. To detect
malfunctions within the wider Internet you will need to configure the WAN
load balancer’s healthchecks facility. By periodically sending healthcheck
packets to remote hosts and monitoring their responses, the router can
determine the health of selected WAN links. The WAN load balancer
healthchecks can be sent from every WAN load balancer resource, to every
configured host.
It is important that you give some thought to your choice of a healthcheck host
and select a site that is highly reliable. The healthcheck host could be a website
critical to your organisation, however, public servers can get overloaded with
requests and may drop healthcheck packets.We recommend that you use
Servers within a VPN network, or an intermediate node within your ISP, as
your healthcheck hosts.
When healthchecks are configured, the operational state of a WAN load
balancer resource is determined by the reachability of its healthcheck hosts. A
WAN load balancer resource needs at least one reachable host before it can
start balancing traffic. If the WAN load balancer has no reachable healthcheck
hosts then the resource will no longer balance its traffic. Although you can
configure healthchecks to operate with any distribution method, only the
weighted fast response method applies load balancing based on network
response.
5 10 15 20 25 30 35 40 45 50 55
60
WANLB_ABW
50
1000
1500
2000
Maximum average throughput over the update interval = 1250 kbps
Instantaneous bandwidth
IP
Throughput
(kbps)
Update Interval (set to 1 minute)
Maximum average
throughput detected
1s 1s 1s 1s 1s
500
1000
1500
Ave BW
750 kbps
Ave BW
1000 kbps
Ave BW
1250 kbps
Ave BW
1000 kbps
Ave BW
750 kbps
Resolution Period (set to 1second)