I am struggling to solve a problem NAT issue and need some help. I need to configure May-to-Many NAT on Palo Alto Firewall between two data centers. I have three /25 IPv4 subnets which needs to be mapped to three /25 subnets (subnet to subnet basis if not one to one IP basis) and three IPv6 /40 subnets needs same treatment. Traffic is expected to come from both direction inside to outside and outside to inside on specified TCP, UDP and ICMP ports. I have PA3220 which has been upgraded to PAN OS 9.0 and I will applicate if you can suggest best way to achieve this? Do I need to consider any resource limitation as I have three /25 IPv4 and three /40 IPv6 subnets which can overwhelm the resource?
Please check out these articles and see if they help out.
I have noticed when Destination NAT configured for IPs which aren't configured on Firewall packets are being dropped so /25(IPv4) and /40(IPv6). If I add subnet as a Loopback interrace on firewall then NAT works. I tried using static discard route (Null route) but its not solving the issue. I am guessing its proxy-arp issue or is it something else? Any other way to solve the issue?
I would do this using several NAT rules (one for each subnet). See the third example on the static NAT section for use with subnets. (I have also configured and tested this in the past)
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