I’m working on Azure portal to create virtual machines with bastion and I was wondering, can I use DHCP server for internal IP addresses? I’m not sure it is possible because when I create a machine it already has an internal IP.
DHCP by default does not exist in Microsoft Azure.
Or you may call it as vNet.
Just like you create a "Scope" of IP addresses in DHCP in an on-premesis environment, similarly, in Azure, you create "Subnet" in "vNet" and then when you create a VM and attach a vNet to it then the IP address is assigned from that subnet.
In simpler terms (not exact terms), you can say that:
vNet -> DHCP
Subnet -> Scope
I just wrote above relation in simpler terms so that you are able to understand it easily.
That's what Azure Virtual Networks is for. Take a look at their documentation here: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-overview
Related
I have created one Web app on Azure portal and its integrated with subnet under specific VNET.
Now, when I am trying to do telnet to one of my organisation's internal relay server IP from my web app its not getting connected. The request is going from web app's APIPA address range not from subnet's address range. I checked the IP as well of the web app using ifconfig and I found out that its taking from APIPA address range not from subnet one.
Any idea what steps do I need to take so that web app will take IP from subnet address range of the VNET not from APIPA address range.
Thanks in advance.
After my validation, when the app service on Linux is integrated with a virtual network. There is an extra NIC binding to the app service. It's IP address from APIPA address range. It looks like a design behavior as the app service on Linux is running in a standard Docker Container, read here. Also, for a normal app service is a multi-tenant environment, you can not get a dedicated IP address unless you are using a dedicated environment---ASE, read here.
Furthermore, from how regional VNet Integration works, you will see the app service integrated with a vNet is not the same as a VM from a VNet.
Regional VNet Integration works by mounting virtual interfaces with
addresses in the delegated subnet. Because the from address is in your
VNet, it can access most things in or through your VNet like a VM in
your VNet would. The networking implementation is different than
running a VM in your VNet. That's why some networking features aren't
yet available for this feature.
In this case, if you wan assign a private IP address for app service, you can use Azure Private Endpoint with web apps(Preview). Read this blog for more details.
Azure Private Endpoint provides private IP address access by using a
network interface controller (NIC) attached to a virtual network
subnet for an Azure web app, allowing access from an on-premise VPN or
ExpressRoute. Implementing an endpoint effectively blocks the public
inbound access. This technology is very similar to an internal App
Service Environment (ASE) but much cheaper.
I have 2 Virtual Networks and each of them has a subnet. I want to assign 2 private IP's to a virtual machine. One private IP resides in 1st Virtual Network while second private IP is in 2nd Virtual Network.
I have tried attaching 2 NIC's to the VM, and attached the first private IP to first NIC and second private IP to second NIC.
When I deploy the ARM template it says that second NIC is referring to a subnet which is not in same Virtual Network?
How can I achieve this in Azure?
How can I achieve this in Azure ?
As far as I know, Azure does not support this.
For now, Azure just support multiple NICs on the same virtual network.
Q:Are there any limitations to this feature that customers must be aware
of?
A:Multiple NIC is supported on Azure VMs (IaaS, Standard SKUs) only;
and VMs must be in an Azure Virtual Network.
More information about multiple NICs, please refer to this link.
Select the existing NIC for the box you are trying to assign the second Private IP,
Select IP configuration on the right tab bar,
Click on +Add, write a name for your new IP address,
Select static Private IP address (it could stay as dynamic as well)
I think your best bet would be Azure VNET Peering, which can loosely be thought of as a VPN between the two VNETs via the Azure backbone. This way, all machines in one VNET can talk directly to all those in the second VNET. It assumes that there's no Address Space crossover between the to VNETs, but if that's the case you may always have struggled.
There's a good article here which explains it in more detail.
The best scenario to implement this through below steps.
Site 2 site between the 2 VNET thru VPN gateway.
Also you have to make the machines in Fail over cluster so as they form a cluster.
I have an Azure Cloud Service, and a Azure Virtual Network with Subnet.
I can deploy the Cloud Service onto the Virtual Network by setting the appropriate configuration setting in the .cscfg.
What I'm struggling with though is bringing the role onto a specific IP address. My guess is that it's currently using DHCP to get an IP address.
I've tried using the following Powershell:
Get-AzureVM -ServiceName myrole | Set-AzureStaticVNetIP -IPAddress 127.16.0.4 | Update-AzureVM
But the IP address never changes:
<IpAddress>172.16.0.5</IpAddress>
Is there a restriction on doing this on cloud services?
Any help would be really appreciated.
Thanks,
Graeme
Network configuration schema for Cloud Service is documented here.
https://msdn.microsoft.com/library/azure/jj156091.aspx
As you'll see, you have the ability to specify a ReservedIP but not a static private IP.
My understanding is that Set-AzureStaticVNetIP works for Azure IaaS VM, not for Cloud Service VM.
Virtual machines whether there are IaaS or Paas provisioned in a VNET are always allocated the first available IP address in the subnet after the first 4 addresses which are reserved from .0 to .3.
So considering your request, I will define subnets that enable to target the right subnet IPs for my role instances, and if I need to precisely know which IP is used by which instance, read it in the "role start" method and use it to configure whatever solution you need for this IP to be be "static".
Hope this helps
Best regards
Stéphane
I had a need to add additional public IP addresses to an Azure VM and found a working solution here:
Azure VM: More than one Public IP
Essentially this creates a reserved IP in Azure and then adds the reserved IP to a cloud service. Once it's bound to a cloud service it can be mapped to a VM endpoint.
This all works great but there is one bit I don't understand - The IP address of the reserved IP and the resultant VM endpoint don't match. I have to set up DNS to point to the IP address of the endpoint to make this work. Is there something I am not doing right, or is this just the way reserved VMs work?
It looks like this unanswered question is the same issue:
azure reserved IP for VM is diffrent than the given
Thanks!
The "Azure Cloud Service" is a container that provides internet connectivity to "Azure VMs". Thus, you assign the Internet facing Public IP to the Cloud Service. This article is relatively good at explaining the relationship: Azure Cloud Services
From above link:
Here’s a definition of an Azure IaaS cloud service that will make it easy for you to understand what it is in the context of Azure Infrastructure Services:
A cloud service is a network container where you can place virtual machines.
All virtual machines in that container can communicate with each other directly through Azure (and therefore don’t have to go out to the Internet to communicate with each other).
This container is also assigned a DNS name that is reachable from the Internet.
A rudimentary DNS server is created and can provide name resolution for all virtual machines within the same cloud service container (note that name resolution provided by the DNS server is only available to the virtual machines that are located within the cloud service).
One or more Virtual IP Addresses (VIPs) are assigned to the container and these IP addresses can be used to allow inbound connections from the Internet to the virtual machines.
Certain services (like FTP) may require your vm have a public IP: Azure VM Public IP
(IaaS v1) An Azure cloud service comes with a permanent DNS name - something.cloudapp.net - and has a single VIP allocated whenever there are VMs deployed in it OR whenever a reserved IP address is associated with it. Traffic is either load balanced or NATted (port forwarded) to the VM from the Azure Load Balancer sitting on the VIP. You can also associate a public instance-level IP address (PIP) with a VM, which gives it an additional IP address. The VIP always has a DNS name (something.cloudapp.net) while the PIP has one only if you specifically add it, I did a post which goes into these differences.
(IaaS v2) VMs are not deployed into cloud services and only have a public IP address if one is specifically added - either by configuring a PIP on the NIC of the VM (and optionally giving it a cloudapp.azure.com DNS name) or by configuring a load balancer and either load balancing or NATting traffic to it. This load balancer is configured with a public IP address and can optionally have a cloudapp.azure.com DNS name associated with it. (Ignoring internal load balancers in this discussion.)
We are attempting to move our domain controller to the cloud to facilitate a distributed network. The crux of the problem we're having is that I am unable to send network traffic through the VPN to the VNet and VM domain controller I've created there.
The setup is as follows: (Main Office) SonicWALL NSA 220. (Branch Office 1) SonicWALL TZ105. (Branch Office 2) SonicWALL TZ105. (Azure) VNet with Site-to-Site networking enabled, VM residing within a subnet within the VNet. I've manually configured the VNet gateway to create the VPN connections to all three locations and have confirmed that the VPNs are live and operational and appear to be functioning correctly.
The VNet was created with a "dynamic" routing gateway, per SonicWALL documentation. The SonicWALLs are configured with "tunneled" VPNs and static routes created from each office to the VM subnet. I have not created any outgoing NAT translation rules because I am operating under the assumption that the VNet gateway performs that function. I've enabled incoming translation rules.
I've created the Windows 2012 R2 virtual machine and configured it as a domain controller. Disabled Windows Firewall (by turning it off in the control panel) and intend to install McAfee SaaS (but will not do so until I have everything working as intended). As of right now, the virtual machine can ping hosts on all three office networks (main office, branch office 1, and branch office 2) however the VM cannot be pinged from outside the subnet in Azure.
The Azure configuration looks like this:
Address Space: 192.168.0.0/21
Subnet 1: 192.168.1.0/16
Gateway: 192.168.0.0/29
Local Network 1: 192.168.10.0/16
Local Network 2: 192.168.11.0/16
Local Network 3: 192.168.12.0/16
Routing configuration is as follows:
Source: [Local Subnet]
Destination: [Azure Subnet 1]
Type: All
Interface: VPN Tunnel
The Virtual Machine resides on Subnet 1 with a static IP address (e.g., 192.168.1.4) configured through Windows Azure Powershell.
Ping from the VM to our local networks works fine. Ping from our local networks to the VNet/VM does not work.
I have a feeling that the problem lies in NAT translation. I looked but was completely unable to find any documentation, discussion, information, or resources addressing how the Azure VNet gateway translates incoming and outgoing traffic. I've tried adding translation rules for incoming traffic from Azure to our local network to no avail.
Any ideas? I am not very familiar with network troubleshooting tools so if a response asks for creation of a log or use of any such tools please provide some detail as to how to do it.
Thanks,
Adam
With further troubleshooting I was able to solve the issue and I can now ping all systems from Azure to Local Network and from Local Network to Azure. The problem was with a default NAT rule on the SonicWALL which provided for use of our public IP address for all traffic originating inside our corporate network unless a more specific rule otherwise applies.
To solve the problem I added the following NAT rule:
Source:
Original-Local Subnet
Translated-Original
Destination:
Original-Azure Subnet
Translated-Original
Service:
Original-Any
Translated-Original
Interface:
Inbound-Any
Outbound-Any
This rule corrected the scenario we were experiencing where our firewall was translating all traffic being sent to Azure as our public IP address which, obviously, would create a problem.