15.2.2 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.
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.
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