AWS Client VPN Deep Dive

Explore the AWS client VPN architecture, designing a VPC with two public and two private subnets, deploying endpoints in public subnets, and planning certificates with a CA and ACM.

Set up a certificate authority server for AWS client VPN in your VPC, generate server and client certificates with the easy RSA wrapper, and prepare them for ACM integration.

Upload the ca server certificate to AWS certificate manager and import it into ACM for AWS client vpn, while troubleshooting aws cli installation and ec2 permissions via roles.

Configure an AWS client VPN using ACM certificates and a security group in a VPC. Enable mutual authentication, select UDP or TCP, and manage split tunneling, routing, and authorization rules.

Test the AWS client VPN by downloading the endpoint configuration, embedding the certificate and key, and installing the Windows client, then ping a private EC2 test server to verify connectivity.

Explore split tunneling in AWS Client VPN by routing only selected traffic through the VPN tunnel to VPC subnets, while other traffic uses local internet, improving performance and reducing costs.

Enable split tunneling to selectively route only necessary traffic through the AWS client VPN, preserving internet breakout, accessing private resources, and reducing cost while maintaining access to critical services.

Build and test a Windows active directory domain controller on EC2, create test users and groups, and prepare AD integration with AWS Client VPN.

connect your Windows Active Directory to AWS using the AWS Directory Service AD Connector, enabling Client VPN to authenticate users against your AD with role-based access.

Set up AWS client VPN with Active Directory authentication via the AD connector, using a single subnet, a default route, and broad user and IP authorization before AD group rules.

Apply Active Directory authorization rules in AWS Client VPN to grant granular access by group, using PowerShell to fetch group IDs, and verify with pings for sales and tech groups.

Learn to decommission an AWS client VPN with AD Connector by removing subnet associations and authorization rules, deleting the endpoint, and removing the directory connector, with notes on split tunneling.

Explore how multi-factor authentication strengthens AWS client VPN by integrating Active Directory with Duo Authentication Proxy for MFA at login, using Radius or LDAP.

Sign up for a free Duo trial, provision a Linux EC2, and install the Duo proxy. Configure radius with Active Directory and AWS client VPN, then run a local test.

Configure the Duo authentication proxy for AWS Client VPN by editing the auth proxy cfg, linking to Active Directory and Duo Cloud for Radius authentication and multi-factor enforcement.

Test the Duo proxy with Freeradius utilities against AD to verify MFA and user authentication. Prepare for the next chapter by integrating AWS client VPN with MFA for secure access.

Install duo proxy on the Active Directory server to enable MFA for the AWS ad connector, validating the shared radius secret, then test with a new ad connector configuration.

Install and configure the AWS client VPN with Active Directory and MFA support. Use the official AWS client VPN app, import the configuration, and test MFA authentication for secure networking.

Master the AWS client VPN MFA integration by troubleshooting Duo logs, adjusting the proxy configuration, and validating a successful dual-push MFA that connects the VPN securely.

Explore AWS client VPN packet flow and transitive routing, VPN endpoint interfaces and traffic in the VPC. Review DNS and security group requirements, and use tcpdump or Wireshark to troubleshoot.

Explore how AWS client VPN transitive routing over VPC peering works, configure authorization rules and route tables, and verify access to a peered VPC web server using ICMP and HTTP.

Demonstrate transitive routing for AWS client VPN via a transit gateway, establishing attachments to VPCs, configuring route tables, and validating connectivity with ping and web traffic.

Create a site-to-site vpn with Strongswan to enable transitive routing from an aws client vpn in Ireland to an on-premises network in North Virginia, including udp 500/4500 and vgw setup.

Demo how AWS client VPN transitively routes to on-premises networks by propagating routes to the AWS subnet via the AWS VPN gateway, enabling site-to-site connectivity.

Explore how AWS client VPN uses Private Link to enable transitive routing across VPCs and accounts via a hub and spoke pattern with Private DNS and ENIs, overlapping CIDRs.

Explore private link transitive routing between a consumer VPC and a producer VPC, using an endpoint service backed by an internal network load balancer and nginx.

Demonstrates setting up a private link endpoint for a client vpn, enabling transitive routing to a remote app across overlapping vpcs, with dns resolution and test verification.

Delete VPC endpoints, endpoint services, load balancers, and target groups to clean up private link resources, then remove NAT gateways and delete the VPC across consumer and producer accounts.

Learn how AWS client vpn uses transit gateway and virtual private gateway attachments to enable transitive routing among vpcs and on-premises networks, with direct connect providing a private high-bandwidth link.

Explain the certificate revocation process for AWS Client VPN users, including generating and uploading CRLs, updating expiry, and automating CRL updates to maintain access control.

Monitor CRL expiry for AWS client VPN endpoints using CloudWatch, CRL days to expiry, and alarms tied to SNS or Lambda automation to import a new CRL.

Monitor and renew AWS client VPN server certificates across their life cycle using CloudWatch and ACM; learn renewal commands for easy RSA 3.1 and 3.2 and validate clients can reconnect.

Enable vpc flow logs at the vpc level to capture traffic to and from enis, then use CloudWatch logs to troubleshoot client vpn connectivity by distinguishing accepted and rejected traffic.

Use VPC flow logs and tcpdump to troubleshoot AWS client VPN connectivity, identify blocked traffic, and validate SSH and ICMP access with security groups and subnet CIDR checks.

Diagnose and fix AWS Client VPN authorization issues by understanding Active Directory group mapping, group IDs, and the longest prefix match, with practical steps to validate and troubleshoot.

Complete the journey into secure remote access on AWS by mastering authentication, authorization, routing, logging, certificate management, and deep troubleshooting to design, deploy, and operate enterprise-grade client VPN solutions.