Load Balancing & Networking
Networking Technologies
There are several networking technologies described herein that apply to Equalizer installations.
They are summarized below, however, specific rules and commands are described further as
each networking scenario is described in detail.
Destination Routing:
This is standard routing that is performed by any networking device. The device
determines how to send a packet to its destination by evaluating the destination IP address to see
if it is on a local network. It if is, the device sends the packet directly using the Ethernet layer. If,
however, that IP address is on a remote network, the device evaluates its routing table to
determine how to send it. The routing table consists of a set of entries in the form:
IP/NETMASK || GATEWAY
The device searches the routing table in a most specific to least specific manner in order to find
the most appropriate route to use. For example, if one entry is for the network 10.0.0.0/8 and
another is for the network 10.0.0.0/24, a packet destined for the IP address 10.0.0.1 would use
the /24 entry because it is more specific. However, a packet destined for 10.0.1.1 would use the
/8 entry because the /24 entry does not apply to this destination. Once a matching route is found,
the device sends the packet on to the gateway (or router) that is specified in this route. It is then
this gateway's job to get the packet closer to its final destination.
Source-Based Routing
: This concept is not unique to Equalizer, however the behavior of each device
that implements Source-based Routing can be different. The definition of source-based routing is
simply that the source IP address is used in the routing decision. For Equalizer, this means that
rather than having a single destination routing table, the system actually has a set of destination
routing tables, each used only when the source IP address of a packet matches a particular
network. A source-based routing table contains entries in the form:
(SOURCE IP/NETMASK,DESTINATION IP/NETMASK) || GATEWAY
If the destination IP address is on a local network, source-based routing is not used. The packet is
sent to the destination system via Ethernet.
If the destination IP address is on a local network, source-based routing is not used by default.
The packet is sent to the destination system via Ethernet. However, administrators can configure
their routing tables to override the local entries for particular networks, in which case Equalizer
will prefer a source route over a local network route. If configured in this manner, Equalizer will
send the packet to an IP gateway associated with the source route rather than simply using the
ARP address of the destination system to send the packet over Ethernet directly.
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Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
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