> For the complete documentation index, see [llms.txt](https://docs.qmcloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.qmcloud.io/examples/deploy-aws-firewall-and-networking-with-qmcloud/vpc-configuration-details.md). # VPC configuration details CIDR Block - 172.21.0.0/19 Three subnets (private, DMZ and Firewall) in us-east-1c Private - 172.21.18.0/23 (EC2 Instance) DMZ - 172.21.30.0/23 (NAT GW and NLB) Firewall Subnet - 172.21.0.0/23 (Firewall) All traffic inbound and outbound is filtered via the firewall **Connections:** Connect each of the subnets to the VPC using the connector (Select the VpcId property end point on the subnet component represented by the red dot and connect to the VPC component represented by green end point on the Vpc shape). The following diagram depicts the VPC and Subnet components and the connection. ![](/files/DHF97XfvJUEpxpRCNGXG) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.qmcloud.io/examples/deploy-aws-firewall-and-networking-with-qmcloud/vpc-configuration-details.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.