I know Virtual network peering is a thing but just like that is VPN Gateway peering is a thing? if so then if a VPN Gateway(A) with AD AuthN(OpenVPN SSL tunnel type) and a VPN Gateway(B) with Azure certificate-based authN with SSTP(SSL) tunnel type, Can A and B be peered.
Questions based on above:
Do we have to do S2S peering setup between A and B with manual routing for each to access any resource from A to B and vice versa?
What is the limitation of this setup and advantages(if any)?
Will it be called a Hybrid solution?
If you have two VPN gateways in Azure, you could configure the VNet-to-VNet connections to connect Azure VNets to each other. You don't need manual routing. VNet-to-VNet supports connecting virtual networks. Connecting multiple Azure virtual networks together doesn't require a VPN device unless cross-premises connectivity is required.
When you connect a virtual network to another virtual network with a
VNet-to-VNet connection type (VNet2VNet), it's similar to creating a
Site-to-Site IPsec connection to an on-premises location. Both
connection types use a VPN gateway to provide a secure tunnel with
IPsec/IKE and function the same way when communicating. However, they
differ in the way the local network gateway is configured.
When you create a VNet-to-VNet connection, the local network gateway
address space is automatically created and populated. If you update
the address space for one VNet, the other VNet automatically routes to
the updated address space. It's typically faster and easier to create
a VNet-to-VNet connection than a Site-to-Site connection.
You could read the document for more details.
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 strange requirement for IKEv1 VPN to a Cisco ASA and Checkpoint system with Azure.
We setup two Azure policy based VNet gateways, virtual networks and associated virtual machines.
The connection has to be IKEv1 AES-256-SHA1-DHGroup2 site-to-site connection per their test and production environments so we setup one for test and production.
The third party system does not support RFC1918 addressing within VPN
tunnels (encryption domain) and/or Peers. There must be publicly
assigned IP addresses for the VPN tunnel, as well as a publicly routed
IP address for the peer.
They recommend using subnets within the tunnel negotiations, and using
your access-lists to narrow this down to specific hosts (subnet SA’s
vs. host SA’s). In the event you need to “hide” multiple hosts behind
a single IP address, you should PAT using a publicly assigned address
to be included in the VPN tunnel. NAT-T (UDP Encapsulation of IPSEC)
is not supported due to global configuration items which affect
multiple customers.
My question is when is NAT-T performed when connecting to an Azure virtual network gateway in policy-based (IKEv1) mode on site-to-site (S2S) connections? Is it done at all or when is it performed? Is it only performed if there is a load balancer out front?
I think I tried to answer the same questions on the MSDN forum. Just re-iterate the answers:
NAT-T is performed on the outer packets/addresses of IPsec packets.
Azure VPN gateway does NOT perform any NAT/PAT functionality on the inner packets in/out of IPsec tunnels. So if you use public IP addresses inside of your on-premises network and your Azure virtual network they will stay the same to/from the Azure VPN gateways and IPsec tunnels.
You can use public IP address spaces as "private" IP addresses on your Azure VMs / Azure virtual network. These will be treated like "private" addresses by the Azure VPN gateways. We will not NAT those inner packets.
Hope this helps.
Thanks,
Yushun [MSFT]
To clarify: Have you gone through this suggestion :
Site-to-Site – VPN connection over IPsec (IKE v1 and IKE v2). This type of connection requires a VPN device or RRAS. For more information, see Site-to-Site:
https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-howto-site-to-site-resource-manager-portal
Point-to-Site – VPN connection over SSTP (Secure Socket Tunneling Protocol). This connection does not require a VPN device. For more information, see Point-to-Site:
https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-howto-point-to-site-resource-manager-portal
VNet-to-VNet – This type of connection is the same as a Site-to-Site configuration. VNet to VNet is a VPN connection over IPsec (IKE v1 and IKE v2). It does not require a VPN device. For more information, see VNet-to-VNet:
https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-howto-vnet-vnet-resource-manager-portal
Multi-Site – This is a variation of a Site-to-Site configuration that allows you to connect multiple on-premises sites to a virtual network.
Only the traffic that has a destination IP that is contained in the virtual network Local Network IP address ranges that you specified will go through the virtual network gateway. Traffic has a destination IP located within the virtual network stays within the virtual network. Other traffic is sent through the load balancer to the public networks, or if forced tunneling is used, sent through the Azure VPN gateway
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/)
I have a virtual network on Azure and would like to establish a VPN connection using the encryption details and shared key that I have received. All the Azure documentation that I've found for point-to-site and site-to-site VPN setups seem to not cover this case, but only cover how an external router can connect to a VPN gateway which has been created on Azure. Is the set up that I want possible with Azure virtual networks or do I need to configure the VPN connection on each VM that I want on the VPN?
You need to create a VNet-to-VNet connection as per this article