Can only access DMZ server using private address, U-turn NAT not working

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Can only access DMZ server using private address, U-turn NAT not working

L1 Bithead

Configuring a new PA-850, new to this so go easy on me.

 

I have three zones, internal, outside, DMZ.

 

DMZ webserver

Private IP = 192.168.2.16

Public IP = 212.12.34.56

 

I have created two NAT rules as follows:

 

internal u-turn to DMZ

source zone = internal

dest zone = outside

dest address = 212.12.34.56

dest translated address = 192.168.2.16

 

external to DMZ

source zone = any

dest one = outside

dest address = 212.12.34.56

dest translated address = 192.168.2.16

 

For purposes of testing this is working I have created a security rule of ANY ANY.

 

I can only view the webserver from the internal network using the internal IP address of 192.168.2.16, using the FQDN or public IP I only get timeouts.  Wireshark on the internal clients show outbound HTTP but Wireshark on the server shows no traffic inbound except when using 192.168.2.16.

 

The u-turn NAT rule is above the public NAT rule and the hide-NAT rule is last in the list.  I am sure I am missing something simple but I have been through the how to u-turn video and guide here: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClEiCAK

 

The only thing I can see is there is also some source translation in the video which is not shown in the document but I think that is a red herring.

 

Any ideas?

1 accepted solution

Accepted Solutions

L1 Bithead

Plugging in the Outside interface into a small switch brought the interface up and the translation between internal and DMZ then occurred as expected.  I don't remember seeing anything about this in the documentation but I guess a one-liner I may have missed.

 

Thanks for posting back OtakarKlier I did learn how to use the monitor a little so it wasn't a waste of time.

View solution in original post

2 REPLIES 2

Cyber Elite
Cyber Elite

Hello,

Make sure you have logging enabled on your policies and see where the traffic is flowing. I know you have your any any policy, but it might not be setup correctly. The thought I had was possible asymmetric routing. So check your virtual router and make sure everything is getting routed correctly.

Regards,

L1 Bithead

Plugging in the Outside interface into a small switch brought the interface up and the translation between internal and DMZ then occurred as expected.  I don't remember seeing anything about this in the documentation but I guess a one-liner I may have missed.

 

Thanks for posting back OtakarKlier I did learn how to use the monitor a little so it wasn't a waste of time.

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