A few days ago, the IP address of our VB Windows Server changed from 40.x.x.x to 13.x.x.x on the Azure platform. We have many loggers in the field that connect to this IP address and now, none of them can connect.
Can the IP change without any warning from Azure?
Also, there is no support to be found. No number, no online support... I mean, This is not a problem I should be paying support for... besides.. support is more expensive than the VM.
Your IP address will change if, for instance, you restart your virtual machine. However, you can set this to be static by doing so:
go to Public IP addresses
Click Configuration
Set assignment to Static
Click Save
This will retain the IP address that you have right now but at an additional cost.
Can the IP change without any warning from Azure?
For now, there is no warning when public IP address change. I think you should know IP address types and allocation methods in Azure.
There are two methods in which an IP address is allocated to a public IP resource - dynamic or static. The default allocation method is dynamic, where an IP address is not allocated at the time of its creation. Instead, the public IP address is allocated when you start (or create) the associated resource (like a VM or load balancer). The IP address is released when you stop (or delete) the resource. This causes the IP address to change when you stop and start a resource.
If you want to public IP address not change, you could change dynamic to static.
Related
I have around 30 VMs on Azure and all have static IP-Addresses. Now suddenly after a restart, one has changed to Dynamic address and got a new IP address.
This happens for 2 machines so far within a 2 weeks period.
How can that happen and how can I get back previous IP addresses since they are registered in a firewall that provides a service to us?
BR
Amin
I did reproduce your issue and found that.
Point 1: Went to ipconfig and make it as static Ip address and did check after restart and stop as well I am getting the same static Ip address.
Point 2: Manually assign the same static IP address in VM itself now I can’t connect to my VM.
So, we don't recommend to make any change on the NIC card settings on the VM.
Point 3: Permanent solution for this not to lost the static Ip address is use the PowerShell command to create a Virtual Machine with the static IP address. If you configure the settings on the NIC card, after reboot it may change the IP address, so the best way to set static IP address is as per the recommended way in the article above.
PowerShell Command to Set Static Private IP
PowerShell Command to Set Static Public IP
Reference : Azure VM looses static IP after stopping and starting the VM in the portal?
When I shutdown a VM from Azure portal, it enters de-allocated state. I understand that if a public ip address is assigned to it, the only way to ensure that it maintains that ip is by creating a static ip address.
But what happens to a (dynamic) private ip address when the VM enters deallocated state ? Does it maintain the private ip address or do I lose it ?
According to the documentation: Once assigned, dynamic IP addresses are released if a network interface is:
Deleted
Reassigned to a different subnet within the same virtual network.
The allocation method is changed to static, and a different IP address is specified.
When you shut down a VM you are not actually doing any of these 3 things. So it should keep the IP address.
The standard way that DHCP works is that an IP address has a Time-To-Live (the default in Windows was 72 hours).
So if all the IP addresses in the subnet have been used and some have expired, since they have not been renewed, due to the VM's being shut down. Then new VM's may start to use some previously assigned IP addresses.
I have an Azure VM with SQL Server on. There are a number of applications using this database via it's public ip address. The ip address is currently set to Dynamic and the VM requires maintenance which could change it. Is there a way of assigning a static ip address to the VM while keeping the current one active while I update the applications to use the new static one?
Is there a way of assigning a static ip address to the VM while
keeping the current one active while I update the applications to use
the new static one?
If I understand it correctly, you just want to change the public IP address to static.
We can change the public IP address to static via Azure portal, that IP address will not change.
I have RM VNET and the address range is 192.168.3.0/24
I have 4 VM running on it without issue.
What I noticed here is I found the IP of the VM's get changed every alternate days and because of this the APP running on the VM's are affected.
For now I have assigned Static IP for the VM's. but need to change it to Dynamic as static IP is chargable
Is there any way to assign a static IP for the VM's without charges?
If this is referring to the free public IP assigned to you, one way to get around the cost is using a CNAME entry in your DNS pointing to your resource's FQDN. Set TTL as low as you can afford so the outside world can pick up the change fast.
Here is an article about how: http://www.codewrecks.com/blog/index.php/2015/10/11/where-is-my-dns-name-for-azure-vm-with-new-resource-manager/
If this is referring to VM's internal IP address such as 192.168.3.3, I don't believe static private IP address is chargeable.
Here is an solid article explain things:
https://azure.microsoft.com/en-us/documentation/articles/virtual-network-ip-addresses-overview-arm/
we need to access our partner's sql azure db, they ask for an ip so they add to the whitelist, thing is we doing the dev work on our azure vm (under different subscription), what ip should we give them, I suppose a public IP address? Will that change over time?
Thanks advance for the help!
Your VM public IP will not change unless all the VMs in that cloud service (the service holding the public IP) are stop/deallocated. Restarting the VM won't change the IP either.
I usually shutdown my VM very carefully to prevent accidentally changing my IP addresses. So far for past few years, I just tried once unintended change.
Note:
You may also consider the newly introduced Reserved IP to reserve an IP and prevent it from changing. However,
[a]t this time, you can’t reserve an IP address for a cloud service
that you have already created.
which means you could only reserve a new IP address if you would like to use Reserved IP.