Mail Exchanger FQDN
The fully qualified domain name (e.g., "mail.example.com") to be returned if
Equalizer receives a “mail exchanger” request for this GeoCluster. The mail
exchanger is the host responsible for handling email sent to users in the
domain. This field is not required.
Responsiveness
This value controls how aggressively Equalizeradjusts the site’s dynamic
weights. Equalizer provides five response settings:
slowest, slow, medium,
fast
, and
fastest
. Faster settings enable Equalizer to adjust its load balancing
criteria more frequently and permit a greater variance in the relative weights
assigned to sites. Slower settings cause site measurements to be averaged over
a longer period of time before Equalizer applies them to the cluster-wide load
balancing; slower settings also tend to ignore spikes in cluster measurements
caused by intermittent network glitches. Use the slider to make your selection.
We recommend that you select the medium setting as a starting point.
Time To Live
The cache time-to-live, which is the length of time (in seconds) that the client’s
DNS server should cache the resolved IP address. Longer times will result in
increased failover times in the event of a site failure, but are more efficient in
terms of network Resources. Use the slider to make your selection. The default
is 120 (that is, 2 minutes).
Multi Response Number
This is the maximum number of Resource records returned in a DNS response
that will be allowed in this GeoCluster. The first address will be the actual selec-
ted GeoSite. Those that follow will be any site which is up in the list of GeoSites.
ICMP triangulation (option)
When a request for name resolution is received by Envoy from a client’s local
DNS, this option (if enabled) tells Envoy to request network latency information
from all sites in order to make load balancing decisions based on the proximity
of each site to the client’s DNS server.
To do this, all Envoy sites send an ICMP echo request (“ping") to the client’s
DNS server. The reply from the DNS server allows Equalizer to select a site
using the length of time is takes for the DNS server’s reply to reach the site.
(Consequently, this method assumes that the client’s DNS server is geo-
graphically close to the client -- which is usually the case.)
If you do not want Envoy GeoSites to ping client DNS servers, disable this flag
(this is the default setting).
Please note that in order for ICMP triangulation data to be collected at each
GeoSite:
The client’s DNS server must be configured to respond to ICMPv4
echo requests (ICMPv6 is not currently supported for Envoy tri-
angulation).
The client’s DNS server must be allowed to respond through any
firewalls between it and the Envoy GeoSites.
Note
- For all policies, the current site load metric is ignored for the first 10 minutes that the site is up, so that the met-
ric value is a meaningful measure of the site load before it is used.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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Equalizer Administration Guide
Summary of Contents for Equalizer GX Series
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