Using Envoy With Firewalled Networks; Working With Geographic Clusters; Adding A Geographic Cluster - Coyote Point Systems Equalizer Installation And Administration Manual

High-performance load-balancing appliance

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For example, assume www.coyotepoint.com is to be balanced across a geographical

cluster containing two Envoy sites, east.coyotepoint.com (at 192.168.2.44) and

west.coyotepoint.com (at 10.0.0.5). In this case, the name servers configured to handle

the coyotepoint.com domain must be configured to delegate authority for

www.coyotepoint.com to both east.coyotepoint.com and

west.coyotepoint.com. When queried to resolve www.coyotepoint.com,

coyotepoint.com's name servers should return name server (NS) and alias (A) records

for both Envoy sites.

Using Envoy with Firewalled Networks

Envoy sites communicate with each other using Coyote Point's UDP-based Geographic

Query Protocol. Similarly, Envoy sites communicate with clients using the DNS protocol. If

one or more of your Envoy sites are protected by a network firewall, the firewall must be

configured to permit the Envoy packets to pass through.

To use Envoy with firewalled networks, you need to configure the firewalls so that:

Envoy sites communicate with each other on UDP ports 5300 and 5301. The firewall

must allow traffic on these ports to pass between Equalizer/Envoy sites.

Envoy sites and clients can exchange packets on UDP port 53. The firewall must allow

traffic on this port to flow freely between an Envoy server and any Internet clients so

that clients trying to resolve hostnames via the Envoy DNS server can exchange

packets with the Envoy sites.

Envoy sites can send ICMP echo request packets out through the firewall and receive

ICMP echo response packets from clients outside the firewall. (When a client attempts

a DNS resolution, Envoy sites send an ICMP echo request (ping) packet to the client

and the client might respond with an ICMP echo response packet.)

To add a new geographic cluster:

Log into the Equalizer Administration interface with edit access.

Select Add GeoCluster from the Add menu in the main menu bar. The Add

GeoCluster dialog is displayed in the right frame. You can also display this dialog by

selecting Add GeoCluster from the local menu when you're viewing Equalizer's

global parameters.

Equalizer Installation and Administration Guide

Working with Geographic Clusters

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