I have the following subnets
Subnet_1 = 10.2.3.0
Subnet_1 = 10.2.4.0
I want to prevent subnet to subnet communication. As far as I see, it can be done using the Network Security Group. However I am not sure about the required change.
I tried to reproduce the same in my environment to prevent communication between 2 Subnet
I have created 2 subnets in my Vnet, like below.
Subnet 1: Prod-Subnet (10.0.1.0/24)
Subnet 2: default (10.0.0.0/24)
In order to prevent communication between both the VNet, you need to create an inbound and outbound rule in same NSG group, like below.
I have created 2 virtual machines and attached above subnets to 2 virtual machines, like below.
Prod-subnet attached to VM1
Default Subnet attached to VM2
Create inbound and outbound rule in Network Security Group to block the communicatioin ,like below.
Inbound Rule:
Source IP: 10.0.0.9/24
Source Port: * ( for all)
Destination IP: 10.0.1.0/24
Destination Port: *( for all)
Service: custom
(Note: If you want block particular service and port, mention the port details and protocol type)
Outbound Rule:
Source IP: 10.0.1.0/24
Source Port: * ( for all)
Destination IP: 10.0.0.0/24
Destination Port: *( for all)
Service: custom
Tested communication and its getting denied from the subnets.
VM 1 Result
VM 2 Result
Related
I have 2 virtual machines (say 'A', 'B') in a subnet within a virtual network.
In the future, I can have multiple VMs in the same subnet.
I want to ensure that only virtual machine 'A' can ping 'B'.
Should I create an Inbound security role in the NSG (Network Security Group) with Source as A's private IP, protocol as ICMP, rule as "Allow", and destination as B's private IP?
Or
Should I be creating an Outbound rule in NSG with the same configuration as explained above for the inbound rule?
I see configuring the Inbound rule is the solution. Is it correct?
Go to VM B's NSG -> Inbound rule -> Add 1) Source = IP Addresses 2)
Source IP addresses/CIDR ranges = private ip address of VM A 3) Source
port ranges = 22 4) Destination = Any 5) Service = Custom 6) Protocol
= ICMP 7) Action = Deny
This will block all ping request from VM A to VM B, if you want to block and
ip ranges you can also paste it on number 2 section.
Please below image: subnetimage
I have below things:
3 VM inside 3 subnet all are in Vnet1.
VM1 has enable IIS and it's private access through subnet B.
Is there any ways to allow traffic from VM2 to VM1? I have tried multiple time but didn't worked.
I have followed below MS Docs, but it allows only internally(private) in network, it's not working for internet.
https://learn.microsoft.com/en-us/azure/virtual-network/tutorial-create-route-table-portal
I've custom template of this scenarios, You have just apply it and all configuration will be created.
you can access from below link:
https://www87.zippyshare.com/v/bEcvSVnC/file.html
I'm new Here , Please help me out from this issue.
Update :
VM1 has assign public IP and I need all traffic from public IP of vm1 from VM2.
Please check below image for more info.
• I would suggest you to please attach one more NIC (Network Interface Card) to the VM1 in subnet A and enable IP forwarding in that NIC along with enabling the same setting in VM2 in subnet B. Since, VM2 is exposed to the internet and has a public IP address but VM1 doesn’t, thus when you configure the NSG (Network Security Group) of both the NICs, ensure that you are creating inbound as well as outbound rules for ensuring traffic flow smoothly over port 80 and 443 through both the NICs. This will ensure that internet traffic over the designated ports is only forwarded from the VM2 to the VM1 and vice versa.
• Also, if you want to, you can attach the additional NIC to VM1 and associate it in some other subnet, i.e., subnet C or any other subnet. This will ensure that the subnet level NSG in effect can be configured for the related subnets only, i.e., subnet in which the additional NIC for VM1 is added and the subnet for VM2. For more information, kindly refer to the below documentation links on attaching additional NICs to the VMs: -
https://learn.microsoft.com/en-us/azure/virtual-machines/windows/multiple-nics
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-network-interface-vm#view-network-interfaces-for-a-vm
Snapshots for reference: -
Update : - Yes, you can surely browse the IIS page by accessing the public IP address of the VM1 in local system through chrome browser. But you will need to open the ports 80 and 443 for inbound traffic access on the VM1's NSG. Also, if you want the VM1 to have a publicly accessible DNS name/label, then you will have to configure the desired DNS name in the VM1 settings. To do the above said configurations, kindly refer to the link below: - https://social.msdn.microsoft.com/Forums/expression/en-US/98da3ab5-3909-4048-b935-95d5f7667ab5/accessing-azure-virtual-machine-iis-website-publicly?forum=WAVirtualMachinesforWindows#:~:text=1-%20Click%20on%20the%20VM,Click%20on%20Save.
Scenario
In Azure, I have the following configuration:
1 VNET (address space) - 10.10.0.0/24
Subnet 1 - 10.10.0.0/28
Subnet 2 - 10.10.0.16/28
VM 1 (in subnet 1) - has IP# of 10.10.0.1
VM 2 (in subnet 2) - has IP# of 10.10.0.17
Problem
I need to create a UDR (a custom route) that allows VM1 to receive all packets from VM2.
What would that route be?
I cannot seem to find any links on the internet explaining this scenario.
I have tested in my environment.
By default, the VM1 in subnet1 is allowed to receive all data packets from VM2 in subnet2 if both subnet1 and subnet2 are in the same Virtual Network. We do not need to create any custom route (User Defined Route) for this
For this to work, the firewall for the private networks needs to be turned off inside both the VMs. Then both the VMs will be able to receive data packets from each other
I created VM1 (10.0.0.4) in subnet1 (10.0.0.0/24) and VM2 (10.0.1.4) in subnet2 (10.0.1.0/24)
I turned the firewall off for private networks in both the VMs VM1 and VM2
I can receive data packets from each other
I pinged VM2 private IP address from VM1 and able to receive the data packets from VM2
I have the following scenario.
2 vnets (same location/location, but different resource groups)
vnetA: Address space 10.1.0.0/16
Gateway subnet 10.1.1.0/24
VM 10.1.0.5
vnetB: Address space 10.0.0.0/16
Gateway subnet 10.0.2.0/24
VM 10.0.1.7
They are both peered through vnet to vnet gateways, but machines cannot ping each other.
Could anyone please guide to documentation or give advice to this please?
You should check the Network Security Groups rules associated to the VNet's Subnets or to the VM's NICs. Unfortunately there is no a specific rule for ICMP protocol, but TCP and UDP only. You have to come up with a rule that suites your needs with the 'any' protocol (i.e. '*').
Instead of using ICMP, when you want to test network connectivity I would suggest to use some TCP protocol based tool like Test-NetConnection and create proper rules in the NSG to let the network traffic pass.
Please, I am trying to do some that should be simple... but it is not working.
I have 03 VMs in the same subnet.
The Subnet has a security group that I created HTTP/80 inbound OK.
Now, I need to open SQL to my second VM in the same subnet.
I already try to change the security group of my VM running SQL to the same of the IIS server.
I did do my Windows firewall inbound rule too. No way.
I tried to created another rule to test if my security group was forwarding correctly, without success.
This is my SQLIN rule:
Priority: 2100 / Source: Any / Protocol: TCP / Source port: 1433 / Target: CIDR Block: x.x.x.x/32 (server vm azure ip (internal) / Target port: 1433 / Action: ALLOW.
I can access my SQL through my VPN, but I need to open to the Internet.
The another test to check if my security group is doing what I create in the rules... is... I try to open RDP through port 3390... and redirect to 3389 (because in this security group I already have 3389 published to another server...)
The rule
Priority: 2120 / Source: Any / Protocol: TCP / Source port: 3390 / Target: CIDR block: x.x.x.x/32 (server vm azure ip interrna) / Target port: 3389 / Action: ALLOW.
I did not have sucess in both rules.
Again: Subnet is associated to this security group, and BOTH VMs are associated to this sec group.
If the 2 VMs are on the same subnet then you don't need to open up the NSG for the machines to talk to each other - you should just be able to use the windows firewall rules. Make the SQL VM private by making sure it doesn't have a public IP, or use the NSG here. I suspect the problem is with windows firewall from the IIS box or into the SQL box.