Service Route Configuration - DNS resolution seems to fail

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Announcements
Please sign in to see details of an important advisory in our Customer Advisories area.

Service Route Configuration - DNS resolution seems to fail

L0 Member

Hi, 

 

I'm currently staging a PAN-VM (8.1.3 KVM) and have hit an issue.

 

The setup:

 

  1. I've configured the interfaces, zones, routing (static default route) etc. correctly.
  2. I've modified the service router configuration to use the Internet facing dataplane interface IP (i.e. customized and not use management interface). That is I allow DNS, NTP, Palo Alto updates to access the Internet via dataplane outside/untrust interface. 
  3. Under device-->services tab I have entered for DNS server settings (8.8.8.8) primary and 8.8.4.4 (secondary).

The issue:

I commit and immediately after I test pings from the CLI to: 8.8.8.8 sourcing from the outside interface and its sucessfully. I then ping google.com (either continuouly or specifying a ping count of 5) and it works 100%. However, after a few moments issuing new pings to google.com fail and I get the "ping: unknown host google.com". Further, I observe the PAN FW can no longer contact the licensing server or palo alto update server as it relies on successful DNS lookups. I turn my attention back to pings to the IP 8.8.8.8 and it doesn't skip a beat. 100% success.

 

Any further commits and immediately pings to google.com work again (continuous or count specified ping)  will yield 100% success. However, as soon as I kill the continuous pings (or use count specified ping) and wait a moment, the pings to domain names (google.com) fail again. 

 

Any ideas?

 

Cheers,

John

 

 

1 REPLY 1

L4 Transporter

@JohnRoberts: Is the issue still persistent?

I would suggest to have a log in the traffic log, if you got any dns response packets, while you experienced the issues.

Nonetheless, the current preferred PAN-OS release is 8.1.8.

If the issue is persitant after upgrading, please test, if other dns resolvers work better for your environment

Best Regards
Chacko
  • 4107 Views
  • 1 replies
  • 0 Likes
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!