User's Manual

Algorithm: Persistence
The configuration of persistent services is the solution to the few situations where link load distribution for
Internet services is undesirable. For example, for security reasons, many e-banking and other secure
websites terminate the session when the client computer’s Internet IP address changes mid-session.
In general, different Internet IP addresses represent different computers. The security concern is that an
IP address change during a session may be the result of an unauthorized intrusion attempt. Therefore, to
prevent damages from the potential intrusion, the session is terminated upon the detection of an IP
address change.
Pepwave routers can be configured to distribute data traffic across multiple WAN connections. Also, the
Internet IP depends on the WAN connections over which communication actually takes place. As a result,
a LAN client computer behind the Pepwave router may communicate using multiple Internet IP
addresses. For example, a LAN client computer behind a Pepwave router with three WAN connections
may communicate on the Internet using three different IP addresses.
With the persistence feature, rules can be configured to enable client computers to persistently utilize the
same WAN connections for e-banking and other secure websites. As a result, a client computer will
communicate using one IP address, eliminating the issues mentioned above.
There are two persistent modes: By Source and By Destination.
By Source:
The same WAN connection will be used for traffic matching the rule and originating
from the same machine, regardless of its destination. This option will provide the
highest level of application compatibility.
By
Destination:
The same WAN connection will be used for traffic matching the rule, originating from
the same machine, and going to the same destination. This option can better distribute
loads to WAN connections when there are only a few client machines.
The default mode is By Source. When there are multiple client requests, they can be distributed
(persistently) to WAN connections with a weight. If you choose Auto in Load Distribution, the weights
will be automatically adjusted according to each WAN’s Downstream Bandwidth which is specified in
the WAN settings page). If you choose Custom, you can customize the weight of each WAN manually by
using the sliders.
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