Last week I was able to roll out split DNS to our production firewalls. This was tested successfully on a firewall in pre-prod and then moved to prod firewalls with same result.
Suddenly this morning queries to explicitly excluded domains are no longer being split. I've verified the configuration is good. I went back to pre-prod firewall and the same situation! This was a previously working config and no changes have been made since. I've verified this by using Wireshark on my local machine while connected to Global Protect. I don't see any DNS queries exiting the local adapter for excluded domains.
Previous to today I was able to see all DNS queries to excluded domains come through Wireshark when monitoring the local NIC.
Has anyone else experienced this problem?
Solved! Go to Solution.
Palo Alto support has confirmed the same behaviour in their lab environment. DNS requests to specific domains that are configured to be explicitly excluded from the VPN tunnel are still being tunnelled across Global Protect to the firewall.
This has been escalated within PA support for further investigation.
So for those of you fighting the same problem, this may be a bug. I will post another update as soon as I know more.
The issue was finally resolved in December and Split DNS is working as it should. However there was more than fix that was involved. For anyone stuck in the same situation I was, hopefully the information below will help.
Palo Alto has thus far done a poor job on the documentation to implement split DNS. About 1/3 of information is spread out across multiple documents which can be hard to track down. The remaining 2/3s of the information needed to configure this required a support ticket to Palo Alto in order to get he full picture.
If anyone from PA reads this forum please publish a complete guide on how to completely configure this feature. It would have saved me a lot of frustration and phone calls to support.
Thank you for the detailed steps in getting Split Tunnel working, I am stuck at the same part but I am running OSX on Macbooks and this option does state (windows only) do you know how this is achieved with OSX.
I've configured everything as you mentioned (except the App feature for all FQDNS,since it's Windows Only)
But when connected to VPN, I see that all public queries done with nslookup are done by the configured DNS Servers in the GP Settings.
Thank you and best regards
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