I have 3 subnets in my VNet and I would like to restrict traffic coming from a VNET integration on a webapp to just one of the three subnets. Is it possible to do that?
Inbound and outbound network traffic on a subnet can be network security group controlled using a network security group. Controlling inbound traffic requires creating network security rules in a network security group, and then assigning the network security group the subnet containing the App Service Environment
It totally possible by using NSG, please follow the recommendations from the service ASE
https://learn.microsoft.com/en-us/azure/app-service/environment/app-service-app-service-environment-control-inbound-traffic#creating-a-network-security-group
Related
For Azure Network Security Groups (NSGs), we have a default inbound security rule called AllowVnetInBound rule.
AllowVnetInboundRule - https://learn.microsoft.com/en-us/azure/virtual-network/network-security-groups-overview#allowvnetinbound
But is there a way to create a rule that denies vnet to vnet inbound rule? I am trying to achieve this both from portal and azure powershell, but I don't see any vnet option in the dropdown for the source.
if I understood correctly, you could use the Service Tag called 'VirtualNetwork' in your Inbound Security Rules, and it should be enough to Deny inbound traffic coming from the same Virtual Network.
We have managed AKS Cluster and it has a few applications PODS. In the same subscription, we have a few servers in the different Resource Group and different VNET. We have a requirement to happen a communication between these two VNET's. I have configured vnet peering between two VNET's but we can see that the communication is not happening.
When I add a rule like "Allow port 443 from all networks" on to the NSG of Virtual machines then everything works fine.
Troubleshooting steps are done.
VNET Peering
Got an API Server IP Address from the "kubeconfig" file and added in the NSG of VM's in a diff RG.
But did not resolve an issue. Could you please help me to fix the issue.
AKS Resources are behind the Internal Load Balancer, so peering did not help. I had to use the Public IP Address provisioned during the AKS Creation process in the NSG. After adding PIP(Available in MC_rg-*** resource group) everything started working.
I would suggest to try connecting the VNET's through VPN gateways .
From an Azure virtual network, connecting to another virtual network is essentially the same as connecting to an on premises network via site-to-site (S2S) VPN.
You will need to go through the below listed steps :
Create VNetA and VNetB and the Corresponding Local Networks.
Create the Dynamic Routing VPN Gateways for each virtual network.
Connect the VPN Gateways.
Please find the referred document for implementing the same solution I have mentioned above .
For more information on difference of vnet peering and vnet gateway you can refer this document.
I'm trying to understand the Network Security Groups and Application Security Groups. What I'm trying to achieve is I have a basic set up as below.
In my vnet, I have 2 subnets which are front-end and back-end and I have 2 NSGs that each subnet is assigned to.
Let's say I decided to allow RDP requests on my "back-end" subnet only for requests coming from the "front-end" subnet and deny any other RDP requests coming from other subnets.
I know that if I create ASGs and assign the FrontEnd VM and BackEnd VM an application security group then I can create a rule on NSG which is to allow RDP request from one ASG to the other ASG to achieve this but if you have dozens of VMs in a subnet then you wouldn't want to waste time to assign an ASG to every VM.
Is there a way to define a rule on a subnet that allows specific requests coming from other subnets?
create a rule and set the source to VirtualNetwork that will allow anyone from inside the Virtual Network (and peered ones) to send that type of traffic. If you want subnet granularity - you'd have to use subnet IP address ranges to allow\deny specific traffic patterns. You might also want to override the default rule to allow anything inside the virtual network
I have an ILB ASE v2 with WAF (public IP). The ASE has its subnet where all web apps reside. For obvious security reasons I think I need to lock down access from Internet and leave only HTTPS open. But when I do that I can't see app services info in the portal. So what should my NSG look like for this subnet?
Also, WAF has its own subnet. It doesn't have NSG assigned either. Should it have one?
When you add a NSG to the AppSercice subnet with Deny All internet traffic, it is blocking the portal to fetch information from App Device. Try adding a NSG rule with greater priority with source IP as Azure Cloud tag and allow it.
So you are blocking all Internet traffic and allowing Azure IPs for communication.
Let me know if it works.
Here's the resulting rules set for ASE subnet NSG:
you might want to add HTTP to it if you need it.
Let's take the following scenario:
I have a resource group in the East Region with 1 VM
I have a resource group in the West Region with 1 VM
Both of these VMs are only accessible via Private IP addresses. RDP via Public IP address is not an option. One would assume that in order for me to RDP to these machines, I would have to VPN into Azure's gateway first. However, I don't want to create a virtual gateway in every single resource group.
Is it possible for me to vpn into one resource (in one resource group), and access all of the machines in all other resource groups?
Yes, It's possible to do this with VNet peering(connecting VNets within the same Azure region). You could follow this to implement a hub-spoke network topology in Azure. In this case, the hub VNet is a peering VNet with allow gateway transit enabled and the spoke VNet is a peering VNet with use remote gateways enabled.
please note that you cannot use remote gateways or allow gateway transit with global peering(connecting VNets across Azure regions). Refer to requirements and constraints about global peering.
To use remote gateways or allow gateway transit, peered virtual
networks in must be in the same region.
so you have to move the peering VNets in the same region if the two VNets in each resource group are not in the same region.
Another option will create a separate VPN gateway in another resource group but this is not your expectation. Note that
A Point-to-Site client can only connect to resources in the VNet in
which the virtual network gateway resides.
Refer to VPN gateway FAQ.
You can use vnet peering with Use remote gateways checkbox enabled. You need to peer the vnets together and check use remote gateways on the second vnet (one without gateway).
Reading:
https://learn.microsoft.com/en-us/azure/architecture/reference-architectures/hybrid-networking/hub-spoke
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-peering-overview