Coyote Point Systems Equalizer GX Series, Administration Manual

Page: 112 / 866

Load Balancing & Networking
How the ADC Routes a Packet
When an ADC sends out a packet, it determines how to send it as follows:
1. The ADC determines whether the packet destined for a system is directly attached to one of
the configured networks.
a. If "Yes", then it needs to determine whether there is a preferred route that spe-
cifies how to send it.
i. If "Yes", it uses that route.This means that the ADC will send the
packet to the router-- using whatever method it has of com-
municating with the router. If you use a router that's on one net-
work, it will send out that packet through the interface connected to
that network.. If you use a router on another configured network
with another IP address, it will send it out of the interface attached
to that address.
ii. If "No", it sends directly (ARP for the address and then send to the
MAC address via Ethernet)
b. If "No," it searches the routes present for the source network that this packet
has in "most-specific" to "least-specific" order. It determines whether a route
exists that matches both the packet's source network and the destination net-
work.
i. If "Yes," it uses that route.
ii. If "No", it drops the packet and returns an error.
Consider the following example using the illustration below. In the example, two subnets are
used. The "10net" (IP 10.10.10./24) and the "11net" (IP 10.10.11/24).
112 Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.