Technical Tip: CNAME alias target domain behavior
Description
This article describes the expected behavior for CNAME target reference.
Solution
Available option
CNAME Record
Explanation
Primary domain may reference to an external third party domain (cloud services) for application redirection.
Configuration
CNAME Record
Alias - An alias name to another true or canonical domain name (the target). For instance, www.example.com is an alias for example.com.
Target – The true or canonical domain name. For instance, example.com.
Explanation
Primary domain may reference to an external third party domain (cloud services) for application redirection.
Configuration
# config global-dns-server zone
# edit "www"
# set domain-name example.com.
# config cname-record
# edit 1
# set alias app.example.com
# set target cloud.fortinet.com.
# next
# end
Validation
Verify DNS query with the below tools:
- NSLOOKUP
- DIG
Note that the primary domain will append to the configured target domain if trailing dots are not configured
For example: cloud.fortinet.com. example.com
If the target domain expected to be the FQDN, then the trailing dots should be added.
# config cname-record
# edit 1
# set alias app.example.com
# set target cloud.fortinet.com[.] ---> trailing dot (without the square bracket)
# next