I have a case where I want to migrate on-prem servers to Azure, but I should still have the local IPs pointing to these VMs. I mean by the local IPs the country-range of IPs since these VMs should be accessed using country IPs for regulatory reasons.
I heard that this is possible, but I have no idea what type of resources I should use to allow this, VNET, VPN, ExpressRoute ?? And how to do it as I have no experience in networking what so ever.
Regards,
NAT is a method of remapping one IP address space into another by modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device.
You can setup a site-to-site VPN between on-prem and Azure Vnet, then deploy a server on-prem run as the NAT device.
It is possible, but with some complications and constraints:
You can run these servers/VMs in Azure using their public IP addresses. You need to create the Virtual Network using these address ranges, but it is possible. The catch here is that these public IP addresses are only accessible via cross premises connectivity solutions such as Azure VPN gateway or Azure ExpressRoute. You cannon access these VMs using their "public" IP addresses directly over the Internet. For this purpose, these public IP address ranges are really treated as "private addresses".
Once you create the virtual network with the public IP addresses (as private address space) in Azure, you will also need to make sure your routing in the on premises network is configured correctly to forward the traffic to these VMs over the VPN tunnels or MPLS/WAN network if you are using ExpressRoute.
If these servers/VMs need to accept requests directly from the Internet, the traffic from the Internet will still come to your on premises network because that's where your ISPs will direct the traffic. You will need to ensure these traffic will be routed correctly over the cross premises connectivity (VPN/ExpressRoute) to Azure.
Hope this helps a bit. Please let me know if this answers your question.
Thanks,
Yushun [MSFT]
Related
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>
The Problem
I'm trying to understand more about networking, firewalls, and IP ranges to help me solve a few real-life problems. The problem I ran into is that the SQL server I'm connecting to has a firewall which can list individual IP's or IP ranges, but my ISP changes my IP fairly frequently, which means that whitelisting my current IP is a temporary solution and I'll eventually be disconnected.
The Question
If I wanted to stabilize my IP and make it so that it comes from a predetermined range (or even a single static IP), would the best way of doing that be to make a virtual network that I can VPN into that has a specified range of IP's? Or is there any easier solution?
Details
I'm interested in the answer at a broad level, but the specific database I'm connecting to is on Azure. Hence, my thought process would be to create a Virtual Network and and a Virtual Network Gateway, which I would connect to using a standard VPN connection tool like Hamachi or Open VPN. I'm assuming then that I could open up a tool like PGAdmin and connect to the database, because the database would consider the incoming connection to be from the IP range that I've whitelisted and that the Virtual Network sits on. Is this accurate?
As you stated, if there is a public IP range from your on-premise outbound traffic, you just need to whiltelist the IP list on the firewall of Azure SQL database server. It is a simple method.
If you want to block the public endpoint from on-premises machines, you can use private endpoint for Azure SQL database. Read On-premises connectivity over private peering for more details.
With Private Link, customers can enable cross-premises access to the
private endpoint using ExpressRoute, private peering, or VPN
tunneling. Customers can then disable all access via the public
endpoint and not use the IP-based firewall to allow any IP addresses.
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!)
I have an azure app service with a web job that grabs data from a web service. The networking properties show that the webjob has a few outbound IPs, which are public Azure IP addresses.
I know that the web service app can be configured to route traffic through a VNET, however, it's not clear to me if the IP is translated to a local IP in the VNET, or if the Azure public IP remains. This obviously has implictions if there are firewalls on the network that block external IP's. Would this also mean that the return route could be over the internet rather than through the network? (espseically if the traffic end's up going down a VPN and outside of Azure - surely a 40. something public azure address would then force a return over the internet, which may not always be possible).
it's not clear to me if the IP is translated to a local IP in the
VNET, or if the Azure public IP remains.
As far as I know, when we use public IP address to communicate the internet, the public IP address will not translated to a internal IP.
I think this might cause an issue when using this with a VPN as I'm
not sure how the return path would know to use the VPN rather than
route over the internet.
When we use Azure P2S or S2S VPN, we can't force the internet traffic through the VPN tunnel.
Update:
Does anyone know if its possible to have my corporate azure account to be assigned a block (e.g. subnet) of azure public IP within a region to make it easier to create firewall rules for my corporate firewall which blocks most outgoing ports.
Our customer does not want anyone sourced inside from the corporate .com account to have access to all 22 and 3389 ports out on the internet, but will limit them to a subnet if we can be assigned a subnet on which we will hang our bastion servers on.
I wouldn't know about blocks of IP's, but you can certainly create a virtual network in which you create all your resources in Azure, and hten configure a firewall in azure, which will have a permanent IP. This can then be used to set up a site-to-site VPN thing between your corporate network and the machines in Azure.
https://azure.microsoft.com/en-gb/services/virtual-network/
For public facing ports, you can add another virtual network card and rest assured that the traffic on one card cannot, in any way pass over to the other, network connected card.
This would also be a better strategy than to set up a range of VM's in Azure with public IP's.