02-23-2022 03:43 AM
i am confuse AWS network firewall and peering section.
As per AWS documents, it said
**AWS Network Firewall cannot be deployed to inspect traffic between VPCs that are peered together; **
this mean AWS network firewall cannot support.
So let me know paloalto can support below scenario ?
i did vpc peering VPC 1 (10.1.1.0/16)and VPC2 ( 10.2.1.0/16).
VPC 1 have one private subnet ( 10.1.2.0/24) behind the PA firewall
VPC 2 have one private subnet ( 10.2.2.0/24) behind the PA firewall
I have the one private route table destination 10.2.2.0/24 next hop is firewall interface in VPC 2.
I add one route to go 10.2.2.0/24 next hop is peer ID in VPC one private route.
I have the one private route table destination 10.1.2.0/24 next hop is firewall interface in VPC 1.
I add one route to go 10.1.2.0/24 next hop is peer ID in VPC 2.
let me know this traffic will pass firewall ?
can we use PA firewall to inspect traffic of private network(10.1.2.0/24 and 10.2.2.0/24) of two vpc which it is peering?
I don't want to use transit gateway.
02-24-2022 08:10 AM
Hi @sthornton ,
Sorry for misunderstanding. I want to go VPC1 to VPC2 passthrough VPC3 PA firewall without using transit gateway and VPN.
02-24-2022 11:25 AM
This is a very odd setup. Why do you have a firewall in every VPC? By default subnet-2-subnet traffic within a VPC is not going to be inspected by the PA. it would be more practical to use VPC3 as the primary "Security VPC" inspecting traffic passing between VPCs.
With that said, your design CAN work but you would need a RouteTable in every subnet, please see below. I only included VPC1 and VPC3, you can duplicate the configuration for VPC2.
02-24-2022 11:29 AM
Another thing to keep in mind is that if you added more subnets within the VPCs you would need to consider the PA VM instance size. I believe you need a C4xLarge just to have the proper number of interfaces to place in each subnet. With more than 4 interfaces you would need to go to bigger instance size and it will start getting pricey.
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