This article offers an overview of using probes to help measure last-mile connectivity and quality for sites.
Overview
Cato's Last Mile Monitoring Probes feature lets you monitor the quality of the last-mile ISP link. You can also monitor the reachability and availability of business-critical applications and the quality of your Internet connection. The Cato Cloud sends ICMP packets over your various transport types to domains or IP addresses that you define. This helps you identify if there is a connectivity problem, such as latency or packet loss.
By default, this feature measures the quality for the ISP links to these destinations: facebook.com, google.com, and amazon.com. However, you also have the option to configure custom websites for Internet and for WAN traffic.
Probes
Cato supports sending different probes to various URLs or IP addresses to monitor the performance of your last mile for different sites. Each probe measures latency and packet loss.
You can assign up to 5 probes for each rule.
Once you configure your probes, you can apply them to your sites using the policy.
Note: Sometimes the destination amazon.com doesn't respond to a Last Mile Monitoring probe, instead you can use www.amazon.com.
Enabling the Last Mile Monitoring Probes Policy
The Last Mile Monitoring Probes policy lets you control which probes are sent to which destinations.
To enable or disable the Last Mile Monitoring Probes policy
From the navigation menu, select Network > Last Mile Monitoring Probes.
Toggle the Last Mile Monitoring Probes Policy slider above the rule base to enable or disable the policy
Configuring the Last Mile Monitoring Probe Policy
The Last Mile Monitoring policy is comprised of two stages:
Defining probes
Creating rules for when the different probes are used
Define a Probe
By default, you have predefined probes to several destinations, some in China and others globally. You can define additional probes for use in your policy. The rules are order-based, meaning, once a rule is matched, it is applied to the site.
While you can configure as many probes as you would like, you can implement only 5 per rule.
To define a probe:
From the navigation menu, select Network > Last Mile Monitoring Probes.
On the Probes page, click New.
Enter a descriptive Name for the probe and complete the following information:
Destination - the URL or IP address to send the probe to
Probe Interval - how often probes are sent. The default is 60 seconds
Configure if you want to Send on last resort links. Take into account that last resort links are often more expensive
Click Apply
Configure a Last Mile Monitoring Policy Rule
By default, you have 2 predefined rules - one for all sites and another for sites in China to meet the requirements for Internet traffic in the region.
You can configure additional rules in the policy. You must assign at least one probe to each rule, and no more than 5 probes.
The rules are order-based, meaning, once a rule is matched, it is applied to the site or user and all following rules are ignored.
To configure a rule:
From the navigation menu, select Network > Last Mile Monitoring Probes.
On the Policy page, click New.
Enter a descriptive Name for the rule and complete the following information:
Rule Order
Select the Source with at least one of the following items:
Site - a specific site or sites
Country - all sites whose origin is the selected country or countries
System Group - Select the All Sites system group
Under Configuration, select the probes to which to apply this rule.
Click Apply and then click Save.