Which allows peered virtual networks to share the gateway and get access to resources?

I have two virtual networks that each have their own virtual network gateway (VNET1 and VNET2). I have connected them with VNET to VNET connections. All resources in each VNET can see each other via PING as well as RDP so I know the VNET to VNET connection is working properly.

I also have a Point to Site configuration setup on VNET1 which allows me to VPN from my onsite premise. When I start up the VPN connection, I can see everything in VNET1, but I cannot see anything in the other VNET (VNET2).

Shouldn't I be able to see resources from both VNETs regardless of which VNET I've established my VPN connection with since they are connected to each other?

Charles Xu

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asked Jun 7, 2018 at 22:42

For your issue, you can use connect VNET1 to on-premise with VPN, and connect VNET1 to VNET2 with peering, but if you want to connet VNET2 from on-premise through VPN, you have to set up gateway transit in both VNET.

You can finish you work following the document Configure VPN gateway transit for virtual network peering and you will get what you want.

answered Jun 8, 2018 at 1:22

Charles XuCharles Xu

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11

A virtual private cloud (VPC) is a virtual network dedicated to your AWS account. It is logically isolated from other virtual networks in the AWS Cloud. You can launch AWS resources, such as Amazon EC2 instances, into your VPC.

A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses. Instances in either VPC can communicate with each other as if they are within the same network. You can create a VPC peering connection between your own VPCs, or with a VPC in another AWS account. The VPCs can be in different Regions (also known as an inter-Region VPC peering connection).

AWS uses the existing infrastructure of a VPC to create a VPC peering connection; it is neither a gateway nor a VPN connection, and does not rely on a separate piece of physical hardware. There is no single point of failure for communication or a bandwidth bottleneck.

A VPC peering connection helps you to facilitate the transfer of data. For example, if you have more than one AWS account, you can peer the VPCs across those accounts to create a file sharing network. You can also use a VPC peering connection to allow other VPCs to access resources you have in one of your VPCs.

When you establish peering relationships between VPCs across different AWS Regions, resources in the VPCs (for example, EC2 instances and Lambda functions) in different AWS Regions can communicate with each other using private IP addresses, without using a gateway, VPN connection, or network appliance. The traffic remains in the private IP space. All inter-Region traffic is encrypted with no single point of failure, or bandwidth bottleneck. Traffic always stays on the global AWS backbone, and never traverses the public internet, which reduces threats, such as common exploits, and DDoS attacks. Inter-Region VPC peering provides a simple and cost-effective way to share resources between regions or replicate data for geographic redundancy.

Pricing for a VPC peering connection

There is no charge to create a VPC peering connection. There is a charge for data transfer across peering connections. For more information, see Amazon EC2 Pricing.

VNet Peering

▪ VNet peering connects two Azure virtual networks.

▪ Two types of peering: Regional and Global.

▪ Peered networks use the Azure backbone for privacy and isolation.

▪ You can peer across subscriptions.

▪ Easy to setup, seamless data transfer, and great performance.

Gateway Transit and Connectivity

▪ Gateway transit allows peered virtual networks to share the gateway and get access to resources.

▪ No VPN gateway is required in the peered virtual network.

▪ Default VNet peering provides full connectivity.

✔️ IP address spaces of connected networks can't overlap.

Configure VNet Peering

▪ Allow forwarded traffic - from within the peer virtual
network into your virtual network.

▪ Allow gateway transit - Allows the peer virtual network to use your virtual network gateway.

▪ Use remote gateways - only one virtual network can have this enabled.

✔️ If you select 'Allow gateway transit' on one virtual network; then you should select 'Use remote gateways' on the other virtual network.

Service Chaining

▪ Leverage user-defined routes and service chaining to implement custom routing.

▪ Implement a VNet hub with a network virtual appliance or a VPN gateway.

▪ Service chaining enables you to direct traffic from one virtual network to a virtual appliance, or virtual network gateway, in a peered virtual network, through user-defined routes.

VPN Gateways

▪ Site-to-site connections: connect on-premises datacenters to Azure virtual networks.

▪ Network-to-network connections: connect Azure virtual networks (custom).

▪ Point-to-site (User VPN) connections: connect individual devices to Azure virtual networks.

Implement Site-to-Site VPN Connections

▪ Take time to carefully plan your network configuration.

▪ The on-premises part is necessary only if you are configuring Site-to-Site.

▪ Always verify and test your connections.

Create the Gateway Subnet

▪ The gateway subnet contains the IP addresses; if possible, use a CIDR block of /28 or /27.

▪ When you create your gateway subnet, gateway VMs are deployed to the gateway subnet and configured with the required VPN gateway settings.

▪ Never deploy other resources (for example, additional VMs) to the gateway subnet.

▪ Avoid associating a NSG with the gateway subnet.

VPN Gateway Configuration

▪ Most VPN types are Route-based.

▪ Your choice of gateway SKU affects the number
of connections you can have and the aggregate
throughput benchmark.

▪ Associate a virtual network that includes the
gateway subnet.

▪ The gateway needs a public IP address.

✔️ It can take up to 45 minutes to provision the VPN gateway

VPN Gateway Types

Route-based VPNs use routes in the IP forwarding or
routing table to direct packets:
Supports for IKEv2.
Can use dynamic routing protocols.

Policy-based VPNs encrypt and direct packets through IPsec tunnels based on the IPsec policies:
Support for IKEv1 only.
Legacy on-premises VPN devices.

*Most VPN Gateway configurations require a Route-based VPN.

Gateway SKU and Generation

▪ The Gateway SKU affects the connections and the throughput.

▪ Resizing is allowed within the generation.

▪ The Basic SKU (not shown) is legacy and should not be used.

Create the Local Network Gateway

▪ Defines the on-premises network configuration.

▪ Give the site a name by which Azure can refer to it.

▪ The local gateway needs a public IP address.

▪ Specify the IP address prefixes that will be routed
through the gateway to the VPN device.

Configure the On-Premises VPN Device

▪ Consult the list of supported VPN devices (Cisco, Juniper, Ubiquiti, Barracuda Networks).

▪ A VPN device configuration script may be available.

▪ Remember the shared key for the Azure connection (next step).

▪ Specify the public IP address (previous step).

Create the VPN Connection

▪ Once your VPN gateways is created and the onpremises device is configured, create a
connection object.

▪ Configure a name for the connection and
specify the type as Site-to-site (IPsec).

▪ Select the VPN Gateway and the Local Network
Gateway.

▪ Enter the Shared key for the connection.

High Availability Scenarios

▪ VPN gateways are deployed as two instances.
▪ Enable active/active mode for higher availability.

ExpressRoute

▪ Private connections between your on-premises network and Microsoft datacenters.

▪ Connections do not go over the public Internet - partner network.

▪ Secure, reliable, low latency, high speed connections.

ExpressRoute Capabilities

▪ Layer 3 connectivity with redundancy.
▪ Connectivity to all regions within a geography.
▪ Global connectivity with ExpressRoute premium add-on.
▪ Across on-premises connectivity with ExpressRoute Global Reach.
▪ Bandwidth options - 50 Mbps to 100 Gbps.
▪ Billing models - unlimited, metered, premium.

Coexisting Site-to-Site and ExpressRoute

▪ Use S2S VPN as a secure failover path for ExpressRoute.

▪ Use S2S VPNs to connect to sites that are not connected with ExpressRoute.

▪ Notice two VNet gateways for the same virtual network.

Virtual WANs

▪ Brings together S2S, P2S, and ExpressRoute.

▪ Integrated connectivity using a hub-and-spoke
connectivity model.

▪ Connect virtual networks and workloads to the
Azure hub automatically.

▪ Visualize the end-to-end flow within Azure.

▪ Two types: Basic and Standard.

You want to connect different VNets in the same region as well as different regions and decide to use VNet peering to accomplish this. Which of the following statements are true benefits of VNet peering?

▪ Network traffic between peered virtual networks is private.

▪ Peering is easy to configure and manage, requiring little to no downtime.

Your company is preparing to implement a Site-to-Site VPN to Microsoft Azure. You are selected to plan and implement the VPN. Currently, you have an Azure subscription, an Azure virtual network, and an Azure gateway subnet. You need to prepare the on-premises environment and Microsoft Azure to meet the prerequisites of the Site-to-Site VPN. Later, you will create the VPN connection and test it. What should you do?

▪ Obtain a VPN device for the on-premises environment.

▪ Create a virtual network gateway (VPN) and the local network gateway in Azure.

▪ Obtain a public IPv4 IP address without NAT for the VPN device.

Your company is preparing to implement persistent connectivity to Microsoft Azure. The company has a single site, headquarters, which has an on-premises data center. The company establishes the following requirements for the connectivity:

▪ Connectivity must be persistent.
▪ Connectivity must provide for the entire on-premises site.

You need to implement a connectivity solution to meet the requirements. What should you do?

Implement a Site-to-Site VPN.

You are configuring VNet Peering across two Azure two virtual networks, VNET1 and VNET2. You are configuring the VPN Gateways. You want VNET2 to be able to use to VNET1's gateway to get to resources outside the peering. What should you do?

Select allow gateway transit on VNET1 and use remote gateways on VNET2

You are configuring a site-to-site VPN connection between your on-premises network and your Azure network. The on-premises network uses a Cisco ASA VPN device. You have checked to ensure the device is on the validated list of VPN devices. Before you proceed to configure the device what two pieces of information should you ensure you have?

▪ The shared key you provided when you created your site-to-site VPN connection.

▪ The public IP address of your virtual network gateway.

You manage a large datacenter that is running out of space. You propose extending the datacenter to Azure using a Multi-Protocol Label Switching virtual private network. Which connectivity option would you select?

ExpressRoute

You are creating a connection between two virtual networks. Performance is a key concern. Which of the following will most influence performance?

Ensuring you select an appropriate Gateway SKU.

Your manager asks you to verify some information about Azure Virtual WANs. Which of the following statements are true?

▪ You must use a VPN device that provides IKEv2/IKEv1 IPsec support.

▪ Virtual WAN supports ExpressRoute.

▪ Virtual WAN supports site-to-site connections.

Which of the following allows peered virtual networks to share the gateway and get access to resources?

Which attributes will allow a VNet to use a VPN gateway connected to a peered VNet?

What type of gateway can be created using virtual network gateway?

Which virtual networks can you peer to VNet1?