Showing results for 
Search instead for 
Did you mean: 
Create a Post

R80.10 FQDN objects and CNAME/aliases

We have been using the new FQDN objects in R80.10 Mgmt/GW, and have been having some issues with them.  As we troubleshoot the rules that don't work, it seems that when the FQDN object resolves a CNAME/alias record, that the rule never gets hit.  It seems that when an A record is returned, it works fine.

An example: returns an alias for: canonical name =

However, the rule was never hit until I added a host object for Unfortunately, that IP is very likely to change.

Is this expected behavior for dns-domain objects that resolve to a CNAME?  IF a CNAME, shouldn't the FW resolve the CNAME/alias to get the IP result to use in the FQDN object/ruleset?

In addition, are there any good command line tools I can use on the R80.10 GW to see what it is using for FQDN objects?  We have been finding these quite difficult to troubleshoot (although we LOVE the idea of these objects if they worked consistently!)

Thanks for any assistance you can provide!

Tags (4)
6 Replies

Re: R80.10 FQDN objects and CNAME/aliases

Have you tried using non-fqdn objects?
The gateway will try to do reverse lookups for all subdomains.

Or you can use "" as domain and it will match the rule.

0 Kudos

Re: R80.10 FQDN objects and CNAME/aliases

I'd rather not use non-fqdn objects as they are inherently un-reliable, and are known to cause performance impact.

The problem with using "" is that if is pointed at different A record, then the rule will break.

Re: R80.10 FQDN objects and CNAME/aliases

hello All,

Just want to check for non-fqdn objects, DO I need to enable the application blade in the CheckpoingR80.10?

0 Kudos

Re: R80.10 FQDN objects and CNAME/aliases

no you don't have to

ps. FQDN and (A) record is a tricky part ... has happened to me couple of times especially with Office365 dynamic-object entries ...


Re: R80.10 FQDN objects and CNAME/aliases

There is a whitepaper which has more detail on FQDN objects.  CNAME support looks to be supported in R80.20, but I don't see it documented anywhere else.  We are also looking forward to this support.


0 Kudos

Re: R80.10 FQDN objects and CNAME/aliases


Please check the following:

1. Validate that DNS server is well defined on the GW

2. Run  'nslookup' on the GW and make sure you get response

3. Run 'nslookup' on the GW and make sure it returns you the IP you expect to (

4. Check that domains cache table is not empty: fw tab -t dns_reverse_cache_tbl

5. If all the above is true, check if you have another domain object that is resolved to the same IP address as the above? (sk145952)


Regarding command line tool - starting R80.20 GWs, domains_tool CLI is available for this purpose (sk161632).




0 Kudos