4.4. Route Load Balancing
Overview
NetDefendOS provides the option to perform
Route Load Balancing
(RLB). This is the ability to
distribute traffic over multiple alternate routes using one of a number of distribution algorithms.
The purpose of this feature is to provide the following:
•
Balancing of traffic between interfaces in a policy driven fashion.
•
To balance simultaneous utilization of multiple Internet links so networks are not dependent
on a single ISP.
•
To allow balancing of traffic across multiple VPN tunnels which might be setup over different
physical interfaces.
Enabling RLB
RLB is enabled on a routing table basis and this is done by creating an RLB
Instance
object. This
object specifies two parameters: a routing table and an RLB algorithm. A table may have only
one Instance object associated with it.
One of the algorithms from the following list can be specified in an RLB Instance object:
•
Round Robin
Matching routes are used equally often by successively going to the next matching route.
•
Destination
This is an algorithm that is similar to
Round Robin
but provides destination IP "stickiness" so
that the same destination IP address gets the same route. The algorithm is always used in
conjunction with an ALG.
•
Spillover
This uses the next route when specified interface traffic limits are exceeded continuously for
a given time.
Important: Destination must be used with an ALG
The
Destination
algorithm
must
be used for traffic that is also subject to a
NetDefendOS ALG. If either
Round Robin
or
Spillover
is used in combination with an
ALG, the behavior may not be as expected.
Disabling RLB
Deleting a routing table's Instance object has the effect of switching off RLB for that table.
RLB Operation
When RLB is enabled for a routing table through an RLB
Instance
object, the sequence of
Chapter 4: Routing
316
Summary of Contents for NetDefendOS
Page 30: ...Figure 1 3 Packet Flow Schematic Part III Chapter 1 NetDefendOS Overview 30 ...
Page 32: ...Chapter 1 NetDefendOS Overview 32 ...
Page 144: ...Chapter 2 Management and Maintenance 144 ...
Page 284: ...Chapter 3 Fundamentals 284 ...
Page 392: ...Chapter 4 Routing 392 ...
Page 419: ... Host 2001 DB8 1 MAC 00 90 12 13 14 15 5 Click OK Chapter 5 DHCP Services 419 ...
Page 420: ...Chapter 5 DHCP Services 420 ...
Page 573: ...Chapter 6 Security Mechanisms 573 ...
Page 607: ...Chapter 7 Address Translation 607 ...
Page 666: ...Chapter 8 User Authentication 666 ...
Page 775: ...Chapter 9 VPN 775 ...
Page 819: ...Chapter 10 Traffic Management 819 ...
Page 842: ...Chapter 11 High Availability 842 ...
Page 866: ...Default Enabled Chapter 13 Advanced Settings 866 ...
Page 879: ...Chapter 13 Advanced Settings 879 ...