It couldn't be A. Cause Cloud NAT is just an outbound NAT and can not DNAT the unsolicited incoming traffic from On-Prem to GCP. In order to intercept ,translate and forward an incoming session into GCP we need to provide additional DNAT rules on an intermediate GCP instance. So the answer will be C I guess.
It is not said it is VPN connection, so we must assume it is traffic between public IPs. GCP recommends to use Cloud NAT. Even if we go with instance machine we need to reserve public IP, enable ip forwarding (b) AND make SNAT for egress connections in iptables (c) AND make DNAT for ingress connections(d). Questions sounds like bidirectional communication. Why it cannot be VPN? Because prefixes and routes are configured on Cloud Router. It is not even possible to bind Cloud NAT and Router together with VPN. It is A or B,C,D (all 3, because it acts like a reverse proxy)
Cloud NAT is a managed NAT service that provides a simple and scalable way to configure address translation between your on-premises network blocks and GCP. Cloud NAT is a fully managed service, so you do not need to manage the underlying infrastructure or software.
The other options are incorrect because:
B. An instance with IP forwarding enabled. This is not a good solution because it is not scalable and it is not as secure as Cloud NAT.
C. An instance configured with iptables DNAT rules. This is not a good solution because it is not as scalable as Cloud NAT and it is more complex to manage.
D. An instance configured with iptables SNAT rules. This is not a good solution because it is not as scalable as Cloud NAT and it is more complex to manage.
Therefore, the best option is to use Cloud NAT.
Answer is A:
Cloud NAT is a distributed, software-defined managed service. It's not based on proxy VMs or appliances. Cloud NAT configures the Andromeda software that powers your Virtual Private Cloud (VPC) network so that it provides source network address translation (source NAT or SNAT) for resources. Cloud NAT also provides destination network address translation (destination NAT or DNAT) for established inbound response packets.
The one thing I do know is that Cloud NAT is NOT the right solution here, since it handles outbound connections from GCP to a single public IP address.
My best guess for the right answer is C, since we need to change the Destination address of packets coming from an on-premises subnet into GCP - i.e. DNAT.
I don't think merely forwarding the packets to a particular address will be sufficient, as we need to perform NAT on an entire network range.
You're wrong... Cloud NAT is a distributed, software-defined managed service. It's not based on proxy VMs or appliances. Cloud NAT configures the Andromeda software that powers your Virtual Private Cloud (VPC) network so that it provides source network address translation (source NAT or SNAT) for resources. Cloud NAT also provides destination network address translation (destination NAT or DNAT) for established inbound response packets.
The Answer is A
C. An instance configured with iptables DNAT rules
This option suggests using iptables DNAT rules for on-premises to GCP NATing. DNAT (Destination Network Address Translation) is often used to redirect incoming packets from a public IP address to a private IP address inside your network, which aligns with the scenario of on-premises to GCP communication.
This is a tough one with the wording but 100% C or D.
A- for internet-based NAT only not private on a VPN
B- This is a requirement for this setup to work but on its own will not perform NAT
c- This is required for on-prem to GCP NATing
D- This is required for GCP to on-prem NATing
If I had to only select one I would choose D since its GCP to On-prem NATing. But B and C would also be required for the full thing to work.
I labbed this up BTW to get these results and B, C, and D were configured sooooooo.... do with that what you will.
Cloud NAT service is not intended to allow communication between on-premises network and GCP resources, it just handles the inbound and outbound Address Translations in GCP (A is wrong)
A. Cloud NAT is the recommended solution for performing address translation between your on-premises network blocks and GCP. It is a fully managed service that provides automatic scaling, redundancy, and high availability. It allows you to translate the private IP addresses in your on-premises network to the public IP addresses used by resources in your GCP network. Cloud NAT also provides a simple and consistent configuration experience, making it easy to set up and manage.
Option B, which is an instance with IP forwarding enabled, can be used to set up NAT for traffic going from GCP to on-premises networks. However, it cannot be used to set up NAT for traffic going from on-premises networks to GCP.
To set up NAT for traffic coming from on-premises networks to GCP, you need to use a solution such as Cloud NAT, which can perform source NAT for outbound traffic from GCP.
I would go for B
"If an on-premises router advertises a custom dynamic route to a Cloud Router managing a Cloud VPN tunnel or Cloud Interconnect attachment (VLAN), Cloud NAT gateways cannot use that route."
https://cloud.google.com/nat/docs/overview#interaction-routes
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