DMZ to inside LAN

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DMZ to inside LAN

L1 Bithead

I know you need a security policy to go from dmz to Lan but do you need a nat statement.  On all the Palo Alto documents that I have seen no nat rule is used.  If I am wrong could some one send me a link.  

 

Thank you 

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L3 Networker

no, DMZ <-> Trust should not require a NAT.

 

As long as the routing is all square, you won't need anything beyond the security policy. With or without the policy in place, the traffic logs should confirm that.

 

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L6 Presenter

Hi,

 

It all depends if you want to "hide" the source ip or/and  if you coming from the private ip address to the public or vice versa. from DMZ to LAN (assuming you do have a private ip address range), if you want to "hide" the DMZ server source  ip address then you can NATed to the PA LAN interface so all request will appear for the LAN users as PA source ip. NAT is not a requirement between the rfc 1918 ip addresses but it is between the public ip as private ip are not allowed on Internet.

Cyber Elite
Cyber Elite

Can you explain what you are trying to do a little bit more, and what your current infrastructure looks like. You may be thinking about a u-turn NAT or hairpinning but without knowing what your setup looks like we can't give you an answer for your enviroment.

Generally the respective zones would just need security policies put into place to allow the traffic. 

L3 Networker

no, DMZ <-> Trust should not require a NAT.

 

As long as the routing is all square, you won't need anything beyond the security policy. With or without the policy in place, the traffic logs should confirm that.

 

View solution in original post

Thank you 

L7 Applicator

As everyone has mentioned, if the hosts are communicating on their connected internal addresses all is good.

 

But I suspect you may be referring the the case where internal hosts get DNS entries with the external address of the servers in your DMZ.  Then you do need to use what is called "U turn" NAT for the connections to work.

 

See this documentation.

https://live.paloaltonetworks.com/t5/Learning-Articles/How-to-Configure-U-Turn-NAT/ta-p/65081

Steve Puluka BSEET - IP Architect - DQE Communications (Metro Ethernet/ISP)
ACE PanOS 6; ACE PanOS 7; ASE 3.0; PSE 7.0 Foundations & Associate in Platform; Cyber Security; Data Center

thank you 

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