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Health Check Method: DNS Lookup
DNS lookups will be issued to test connectivity with target DNS servers. The connection will be treated as up if
DNS responses are received from one or both of the servers, regardless of whether the result was positive or
negative.
Health Check
DNS Servers
This field allows you to specify two DNS hosts’ IP addresses with which connectivity is to
be tested via DNS lookup.
If
​ Use first two DNS servers as Health Check DNS Servers ​ is checked, the first two
DNS servers will be the DNS lookup targets for checking a connection's health. If the box
is not checked,
​ Host 1 ​ must be filled, while a value for ​ Host 2 ​ is optional.
If ​ Include public DNS servers ​ is selected and no response is received from all specified
DNS servers, DNS lookups will also be issued to some public DNS servers. A WAN
connection will be treated as down only if there is also no response received from the
public DNS servers.
Connections will be considered as up if DNS responses are received from any one of the
health check DNS servers, regardless of a positive or negative result. By default, the first
two DNS servers of the WAN connection are used as the health check DNS servers.
Health Check Method: HTTP
HTTP connections will be issued to test connectivity with configurable URLs and strings to match.
URL1
WAN Settings>WAN Edit>Health Check Settings>URL1
The URL will be retrieved when performing an HTTP health check. When ​ String to
Match ​ is left blank, a health check will pass if the HTTP return code is between 200 and
299 (Note: HTTP redirection codes 301 or 302 are treated as failures). When
​
String to
Match ​ is filled, a health check will pass if the HTTP return code is between 200 and 299
and if the HTTP response content contains the string.
URL 2 WAN Settings>WAN Edit>Health Check Settings>URL2
If
​
URL2
​
is also provided, a health check will pass if either one of the tests passed.