I'd like to setup a VPN connection from my office towards Azure.
The Azure environment should also contain Local Network Gateways for every customer that we're working towards.
My first question is: Will my customers be able to reach eachothers networks if they are connected to the same Local Network Gateway? If Yes, will this be prevented by creating seperate Local Network Gateways for every customer?
The Local network gateway represents the public IP address of the local VPN device. If all customers are connected to the same VPN device. It's possible that they are connected.
There are Policy-based and route-based VPN devices in Azure. The document has clarified that the on-premises networks connecting through policy-based VPN devices with this mechanism can only connect to the Azure virtual network; they cannot transit to other on-premises networks or virtual networks via the same Azure VPN gateway. If you are using route-based VPN devices, you may configure firewall rules on the on-premise network to restrict the networking traffic from one on-premise network to another on-premise network.
Related
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.
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.
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 an application that different clients will connect to on Azure. Each of my customers needs to connect to their Corresponding own Server ONLY in Azure from their local networks.
What kind of connection (P2S,S2S) can i create from each of my customers PC to connect ONLY with their Server in Azure?
According to your scenario, I think P2S is better for you.
Site-to-Site configurations are between your on-premises location and Azure. This means that you can connect from any of your computers
located on your premises to any virtual machine or role instance
within your virtual network, depending on how you choose to configure
routing. This type of connection relies on an IPsec VPN appliance
(hardware or soft appliance), which must be deployed at the edge of
your network. To create this type of connection, you must have the
required VPN hardware and an externally facing IPv4 address.
If my understanding is correct, your customers clients are not in one location, they have different private IP. Based on my knowledge, you could not use S2S VPN.
Point-to-Site configurations let you connect from a single computer
from anywhere to anything located in your virtual network.
P2S VPN does not require a VPN device. It is better for your scenario.
More information about difference between a Site-to-Site connection and Point-to-Site please refer to this link.
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/)