It seems like there are a lot of traffic routing options when using Azure's Point-to-site VPN but I can't find any details on when you're connected through the Azure VPN client. Can you, then, send that traffic out through the Azure Firewall egress point. We don't use the default Azure Egress because we need our Azure traffic to come from a single IP (from the AFW)
Any ideas if you can route the traffic coming in from the Client VPN, out through the Azure Firewall?
You need to add a UDR on the gateway subnet with a route stating that if the destination IP is subnet range of your VM, next hop Virtual Appliance as Azure Firewall IP(Private IP).
So the traffic from your P2S client reaches VPN gateway, and will be forwarded to the Firewall.
You need to configure DNAT rules in your Azure Firewall to forward the packets to the correct destination.
Let me know if you have any questions.
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
In our Azure tenant we have a Azure Firewall and a VPN connection with our on prem servers. I want to route all traffic through the azure firewall, whether it's incoming traffic from on prem to azure or outgoing traffic from azure to on prem.
For traffic inside azure I have created a routing table for each subnet and pointed to the firewall. Is this correct? And what do I have to configure for the on prem connection part. Further, how can I test it?
Thanks and best regards
To route traffic coming from the on-prem network, through the Azure Firewall, you also need to specify a route on the "GatewaySubnet".
This route table should contain the (Azure) subnets you want to reach from on-prem.
So if you for example have a subnet 10.5.5.0/24 in Azure, and you want to reach that from On-Prem.
Add a route table, with a route to 10.5.5.0/24, next hop type "Virtual Appliance" and Next Hop IP the private IP of your Azure Firewall.
Add this route table to the GatewaySubnet. (Some times you cannot assosiate from within the route table itself, but have to to through Virtual Network > Subnet and specify the route table there.
(And allow the traffic in the Azure Firewall.)
Is there a VPN solution in Azure that can assign a static public IP to the clients connected for me to achieve full tunnelling? may be in P2S VPN?
P2S VPN does not have full tunneling. Is there any other alternate solution?
• No, you can’t assign a static public IP address to the clients for a VPN solution in Azure as the client address pool that needs to be defined while deploying a VPN gateway in Azure is a subnet of the IP address spaces that the virtual network is created out of.
But you can configure forced tunnelling in your Azure virtual network on your VPN gateway subnets as illustrated below. In the below image, forced tunnelling is shown for Site-to-Site VPN scenario but it can also be implemented for Point-to-Site VPN scenarios in the same way. The Frontend subnet is not force tunneled. The workloads in the Frontend subnet can continue to accept and respond to customer requests from the Internet directly. The Mid-tier and Backend subnets are forced tunneled. Any outbound connections from these two subnets to the Internet will be forced or redirected back to an on-premises site via one of the Site-to-site (S2S) VPN tunnels as shown below.
This allows you to restrict and inspect Internet access from your virtual machines or cloud services in Azure, while continuing to enable your multi-tier service architecture required. If there are no Internet-facing workloads in your virtual networks, you also can apply forced tunneling to the entire virtual networks.: -
• Also, please note that you can *configure the above for your P2S clients by securing the Internet traffic via Firewall Manager and advertising the 0.0.0.0/0 route to your VPN clients. This makes your clients send all internet bound traffic to Azure for inspection. Then, firewall SNATs the packet to the PIP of Azure Firewall for egress to Internet. For this purpose, setup the Azure Firewall Policy to allow P2S traffic to Internet and to advertise all the traffic from 0.0.0.0/0 to your VPN clients, you would need to break them into two smaller subnets 0.0.0.0/1 and 128.0.0.0/1 as mentioned in the below documentation: -
https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-p2s-advertise-custom-routes#forced-tunneling
Also, you can add the code below in your ‘azurevpnconfig.xml’ file that can be directly downloaded from the templates section if the above said subnets cannot be added in ‘Default Routes’ on the portal.
<clientconfig>
<includeroutes>
<route>
<destination>0.0.0.0</destination><mask>1</mask>
</route>
<route>
<destination>128.0.0.0</destination><mask>1</mask>
</route>
</includeroutes>
</clientconfig>
I have setup Azure WAN with a secured hub(Azure Firewall). WAN also has a P2S VPN which am successfully able to connect to. I understand forced tunneling was not an option before Azure VWAN, but now can i do forced tunneling for my P2S clients and give them a common public IP address instead of their own ISP Public IP Address?
Yes, you can do forced tunneling for your P2S clients.
If you secure internet traffic via Firewall Manager you can advertise the 0.0.0.0/0 route to your VPN clients. This makes your clients send all internet bound traffic to Azure for inspection. Then, firewall SNATs the packet to the PIP of Azure Firewall for egress to Internet.
I have a VMSS/svc fabric cluster on internal vnet (not public). The only inbound connections to the VMSS is from on prem through a Azure VPN Gateway.
How do I control the outbound IP address the VMSS go through when accessing the internet? In this case I do not want this traffic routed through a random IP address or through the VPN connection.
Basically I want to secure my Azure SQL so that the outbound internet IPs of the VMSS is whitelisted. And I don't want to add all Azure datacenter IPs.
You could look to use Forced Tunneling which would ensure that your control where the data egress occurs in your on-premises environment, however this would force any data in your Virtual Network back over your VPN connection which may not be desirable (or helpful if you don't control egress from there).
Failing this you could add a software-based firewall running on an Azure VM with a public IP onto the same VNet and then use User Defined Routes (UDRs) to force all traffic bound for the Internet to go via that and then use the public IP address in your SQL firewall.
Longer term you will be able to connect Azure SQL DB to VNets (or at least restrict access to it from one) - see the Uservoice site (and add your vote!)