Configuring DNS proxy - interface is invalid

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Configuring DNS proxy - interface is invalid

L1 Bithead

I have network sub interface with DHCP enabled, I'm trying to attach DNS proxy to it because I need to resolve a name which is not resolved by the DNS server we are using (say 8.8.8.8) but I'm getting erros:

 

  • Details:
  • . Validation Error:
  • . network -> dns-proxy -> TV_DNS_INTERNO -> interface 'ethernet1/7.302' is already in use
  • . network -> dns-proxy -> TV_DNS_INTERNO -> interface is invalid
  • . Commit failed

TV_DNS_INTERNO is shared but I also get erros when it's vsys.

 

I also have doubts regarding how dns proxy works, should I set the IP of this sub-interface as the DNS to my clients?


Thank you.

1 accepted solution

Accepted Solutions

Cyber Elite
Cyber Elite

Hello,

You need to use the interface that is configured with the vlan's IP. My guess is that the interface you are using is setup as a L2 insteaf of a L3. Do you have a vlan interface that is setup as a L3? If yes then try and use it.

 

https://www.paloaltonetworks.com/documentation/80/pan-os/pan-os/networking/dns/use-case-3-firewall-a...

 

Check step 4. the physical interface doesnt have to be L3 but the vlan should have a L3 interface so it can route the packets.

 

Hope that helps.

View solution in original post

1 REPLY 1

Cyber Elite
Cyber Elite

Hello,

You need to use the interface that is configured with the vlan's IP. My guess is that the interface you are using is setup as a L2 insteaf of a L3. Do you have a vlan interface that is setup as a L3? If yes then try and use it.

 

https://www.paloaltonetworks.com/documentation/80/pan-os/pan-os/networking/dns/use-case-3-firewall-a...

 

Check step 4. the physical interface doesnt have to be L3 but the vlan should have a L3 interface so it can route the packets.

 

Hope that helps.

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