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selected 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 servers reply to reach the site.
(Consequently, this method assumes that the client’s DNS server is
geographically 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 triangulation).The client’s DNS
server must be allowed to respond through any firewalls between it and the
Envoy GeoSites.
Note - In Version 10, if ICMP triangulation is enabled and all GeoSites report that triangulation failed, then ICMP
triangulation is ignored for GeoSite selection. That is, Envoy geographic load balancing will proceed as if ICMP
triangulation were disabled. [In Version 8.6, if no GeoSites successfully completed ICMP triangulation then Envoy
would send a NULL response.]
If only some GeoSites report failed triangulation, and there are others that did not fail and that are not down, then
GeoSite selection will only include those sites that successfully completed ICMP triangualtion. [This is the same as the
Version 8.6 behavior.]
Copyright © 2013 Coyote Point Systems. A subsidiary of Fortinet, Inc.
All Rights Reserved.
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