I deployed an openvpn virtual appliance and clients can reach peered networks, the VNET of the appliance itself, but not the network onpremise that is reachable via the virtual network gateway (routed VPN). When I use the P2S OpenVPN provided from Azure clients can reach onpremise network. What am I missing ?
I deployed an OpenVPN appliance because Azure OpenVPN lacks ccd support.
I solved the problem by adding the OpenVPN client IP range to the VNET address space. I then created a subnet with the same IP range. Obviously, you can't put any resource in this subnet. By then adding this subnet to the route, OpenVPN clients could traverse the gateway.
After my test on my windows client, I can directly access the on-premise network from the Azure VPN gateway based VNet or access the resources in the VPN based VNet from the on-premise network. You could follow these tutorials:
Configure a Point-to-Site connection to a VNet using native Azure certificate authentication: Azure portal
Set up OpenVPN® Protocol on Azure VPN Gateway.
Configure OpenVPN clients for Azure VPN Gateway
I have not deployed an OpenVPN virtual appliance, but I think it will be something like this: Point-to-Site (P2S) connection using OpenVPN infrastructure
According to this quick start, If you use a virtual VPN appliance, It is necessary to create a routing table on Azure so that traffic to your VPN subnet is directed back to your VPN instance and enable IP forwarding for this network interface. You could get more details about custom routes.
Feel free to let me know if I am misunderstanding you.
Related
I have been trying to tackle a problem where I need to create a second VPN tunnel to a site (SiteA), this site already has a VPN tunnel set up with our VPN Gateway.
SiteA is unable to create a second tunnel to our VPN gateway public IP, as a route already exists.
I need to knnow can I add a second IP to the vPN gateway, which I think is a NO, but I can't find anything concrete to validate that, and if that's not possible, can we add a second VPN gateway into the same GatewaySubnet, in our hub vNET.
Although I think this would be problematic as how would the traffic from firewall know which tunnel to send the taffic to.
Some backgound: Hub and spoke design with hub consisting of Az firewall and Az VPN gateway. Peered spokes route through FW to get to VPN gateway. Hope that makes sense.
Thanks in advance.
To create a second VPN tunnel to a site (SiteA), which already has a VPN tunnel set up with your VPN Gateway, you can enable your Azure VPN gateway for an active-active configuration, where both instances of the gateway VMs will establish S2S VPN tunnels to your on-premises VPN device, as shown in the following diagram:
Refer : https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-highlyavailable#active-active-vpn-gateways
In the Active-active Azure VPN gateway configuration, each Azure gateway instance will have a unique public IP address, and each will establish an IPsec/IKE S2S VPN tunnel to your on-premises VPN device specified in your local network gateway and connection. You will need to configure your on-premises VPN device to accept or establish two S2S VPN tunnels to the two Azure VPN gateway public IP addresses which are created when active-active option is enabled and because the Azure gateway instances are in active-active configuration, the traffic from your Azure virtual network to your on-premises network will be routed through both tunnels simultaneously, even if your on-premises VPN device may favor one tunnel over the other.
To change/update an existing Azure VPN gateway from active-standby to active-active mode, refer the below doc:
https://learn.microsoft.com/en-us/azure/vpn-gateway/active-active-portal#-update-an-existing-vpn-gateway
We need a configuration set up exactly like the one described by the diagram in this support document. However, we already have the bottom right 2/3 configured, and it is not clear to me how the Point-to-site VPN should be configured:
Our Azure VMs and our on-premises machines share a VNet, connected via a site-to-site route-based VPN tunnel. We want to add our App Services to that VNet so they can also communicate privately with the VMs, but the documentation for configuring a Point to Site connection assumes you are starting from scratch, rather than adding to an existing VNet, and it does not cover Point-to-site connections to App Services.
It seems like a Point-to-site configuration needs to be added to the existing gateway, but I am unclear on several issues not covered by the documentation: How are certificates handled? What tunnel type is supported/preferred in App Services. Should the address pool of the Point-to-site config match the VNet's Gateway subnet range?
Update: After adding an address pool value for the Point-to-side configuration in the existing VNet gateway, the VNet could be added to our App Service. But even though The App Service VNet config reports that certs are in sync and that the gateway status is online, the App Service does not seem to be able to communicate with a VM, and nothing is listed under Allocated IP addresses in the Point-to-side configuration.
I am not sure if additional configuration is needed or if this implies a problem with the VNet addressing. The VNet default subnet is 10.1.0.0/24, the VNet gateway subnet is 10.1.1.0/24, and the Point-to-site pool is 10.1.2.0/24.
How are certificates handled?
You don't need to create certificates for the Point-to-Site configuration. Certificates are automatically created when you connect your WebApp to the VNet using the portal.
What tunnel type is supported/preferred in App Services?
This is a reference to the P2S VPN features, you can take a look at this link. P2S supports the protocols such as Secure Sockets Tunneling Protocol (SSTP) and IPsec.
Should the address pool of the Point-to-site config match the VNet's
Gateway subnet range?
You should not match the address pool of P2S with VNet's Gateway subnet. They are two address pools with different network.
I have a VM running a WebAPI service that I want to hit from an Azure web app using a vnet-to-vnet conneciton. As such, I have the VPNs configured as follows:
Virtual Machine - VMVnet
Address Space: 10.1.0.0/16
Subnet: 10.1.0.0/24
Gateway Subnet: 10.1.1.0/27
Private IP: 10.1.0.4
I also opened the target port up in Windows Firewall.
Web App - AppVnet
Address Space: 10.2.0.0/16
Subnet: 10.2.0.0/24
Gateway Subnet: 10.2.1.0/27
I also have Virtual Network Gateways configured for both, each with a connection going to the other.
Now, after I connect the app to AppVnet and sync the routes from the app service plan's networking section, I should be able to hit the VM using its private IP from the app code. When I try, I get the following error:
An attempt was made to access a socket in a way forbidden by its access permissions
I also tried setting up Virtual Network Peering between the networks, but that didn't work either.
Is what I'm trying to do even possible with Azure web apps? I saw this question, which seemed like what I was looking for but the information in it is a bit lacking.
If not, I have tried this with a point-to-site configuration with the app connected to the VM's vnet, and it worked fine. Would it be preferable to set up a second nic on the VM using the AppVnet and connect all apps through that?
I'm just wondering why neither the vnet-to-vnet nor vnet peering works
with the web app
First of all, you need to know to Integrate your app with an Azure Virtual Network.
Here are some things to keep in mind before connecting your web app to
a virtual network:
If your target virtual network already exists, it must have point-to-site VPN enabled with a Dynamic routing gateway before it can
be connected to an app.
If your gateway already exists with point-to-site enabled, and it is not in the basic SKU, IKEV2 must be disabled in your point-to-site
configuration.
That is to say, you already have a P2S connection that you can connect to AppVnet from your App. If you want to connect to VMVnet through the AppVnet from your app, you can achieve it by gateway transit for virtual network peering in hub-and-spoke network architecture.
In the diagram, gateway transit allows the peered virtual networks to use the Azure VPN gateway in Hub-RM. In this case, your AppVnet is the Hub-RM. Your web app is the VPN client in a P2S VPN connection.
I am not sure that you real configuration in your side, but I guess your creating Vnet to Vnet connection is just like Hub-RM to Spoke-RM connection in the diagram, so it does not work. Setting up Vnet peering and gateway transit enabled, it should work. For more details about Configure VPN gateway transit for virtual network peering.
My goal is to connect from an external computer to both a Azure virtual network as well as a small on-premise network via an Azure VPN Gateway:
The Azure virtual network has the address range 10.1.0.0/16.
The on-premise network has the address range 10.2.0.0/16.
So far, I have done the following:
Set up a virtual gateway on the virtual network.
The virtual gateway is configured as a point-to-site VPN gateway.
The virtual gateway is connected to the on-premise network via a site-to-site connection.
So the topology looks like this:
VPN-client =p2s=> Azure =s2s=> On-premise
I can now dial in via VPN, but I can only ping addresses within the virtual network. On-premise addresses are not reachable.
I have also added the line
ADD 10.2.0.0 MASK 255.255.0.0 default METRIC default IF default
to the routes.txt file on the VPN client, but it's still not working.
This is not possible to achieve this.
Why
First, Azure VNet is a logic isolation and segmentation. Each virtual network is isolated from other virtual network.
When you try to connect the VNet Via P2S VPN, your client can communicate with resources in the VNet. But it cannot direct the traffic out of the VNet.
When you try to connect the VNet via S2S VPN, your site can communicate with the resources in the VNet.But it cannot direct the traffic out of the VNet.
Because they are using different Gateway and have different CIDR and Azure VNet cannot route the inbound traffic to one specify outbound gateway.
For Example
VNetA <peering or VPN gateway> VNetB <peering or VPN gateway> VNetC
But VNetA cannot communicate with VNetC
This is important for Azure VNet to reach isolation and segmentation.
I have a couple of queries about Azure VNet to On-Premises Site-to-Site networking -
As per Azure, Site-to-Site connection between On-Premises and Azure VNet should have a VPN tunnel. For this to happen there should be a VPN supported device at On-Prem and also a VPN Gateway at VNet. Is my understanding correct ?
Secondly, if a custom device capable of VPN functionality is deployed at On-Prem as well as a VM in Azure VNet, can they establish a connection between them without default Azure provided Site-to-Site VPN tunnel ? Is it possible to establish a network in Site-to-Site without VPN tunnel like with just igw's(Internet Gateways in AWS Cloud)?
What is the significance of next hop being "Internet" in azure route table ?
Yes. This device should also have a real external ip address, not behind the NAT.
Yes, you could use, say, Sophos to create VPN without using Azure's default VPN.
Internet. Represents the default Internet gateway provided by the Azure Infrastructure. (https://azure.microsoft.com/en-us/documentation/articles/virtual-networks-udr-overview/)