I have one vnet in Australia East and another in Australia southeast
I need minimum latency setup between these 2 regions.
I am looking at ER connection to both VNET but cant find any detailed guide on this. Traffic will be bidirectional.
Please suggest if someone carried out something similar
Thanks
There are three options to achieve connecting Vnet's in different regions:
Global VNET peering
VNET-to-VNET connection
Expressroute
As for the question,
How to connect 2 cross region azure Vnet using express route ?
Each VNET that is connected to an Expressroute circuit, becomes part of the same routing domain. This means that each VNET that is connected to Expressroute, regardless of whether it is in the same region or in a different region, will have connectivity to each other.
The connection between the two gateways would happen at the peering location, but would not go over the peered network. Meaning, the connection stays on the Microsoft network, but the hairpin happens at the peering location.
Reference: How to Link Vnet to ExpressRoute Circuit
Related
I want to connect 2 virtual machines, one is in North America and the other one in Asia.
When I say I want to connect 2 virtual machines, it is simply that once this tunnel is established, they can talk to each other by IP and connect/talk to each other as if in the same network. Only these 2 machines will talk to each other.
I would like this connection to pass through the Azure cloud as such:
Machine in North America will connect to the Azure cloud in North America.
Machine in Asia will connect to the Azure could in Asia.
Data between North America and Asia will be Azure cloud to Azure cloud only.
I have read on bastion, gateway and other Azure network offerings but I am not certain of what I need to actually make this happen. I feel a bit overwhelmed with all the products Azure offers and I am not sure what I should be using to do what I need.
• Since you want to deploy one of your virtual machines in North America region and the other one in Asia, and further you want the communication between them to happen over Azure cloud itself, then would suggest you to please use the ‘Global VNET peering’ option for this purpose. As you will deploy virtual machines in the respective region’s virtual network which are managed by Azure service fabric’s network resource provider, you can peer these virtual networks which are deployed in their respective regions over Azure’s backbone network itself and accordingly open the ports through the virtual machine’s independent network security group. An illustration of the above scenario is given below: -
• A second way to connect two VNETs in different locations is by using a VNET-to-VNET connection. A VNET-to-VNET connection is essentially a VPN between the two different Azure locations. The VNET-to-VNET connection is established on a VPN gateway. This means your traffic will incur two additional traffic hops as compared to global VNET peering (the two gateways on each end). This also means that you will incur additional latency, and the VPN gateways can become a bandwidth chokepoint. The one benefit of using a VNET-to-VNET connection is that the traffic between the different Azure regions will be encrypted using IPSEC. VNET peering runs over the Microsoft backbone unencrypted, while a VNET-to-VNET connection uses IPSEC to connect the two VNETs together. An illustration of the above said is given below: -
• Also, you can use ‘Expressroute’ to connect VNETs in multiple Azure regions together. Each VNET that is connected to an Expressroute circuit, becomes part of the same routing domain. This means that each VNET that is connected to Expressroute, regardless of whether it is in the same region or in a different region, will have connectivity to each other. The downside of this connection model is that all the traffic is hair pinned over the Expressroute peering location. This means you introduce additional network latency. The connection between the two gateways would happen at the peering location but would not go over the peered network. Meaning, the connection stays on the Microsoft network, but the hairpin happens at the peering location. An illustration of the above said is given below: -
Again, I tried to create a VNet-to-VNet connection.
Briefly, I created
Gateway Subnet at East US Region
Gateway Subnet at West US Region
Virtual Network Gateway for East US Region and
Virtual Network Gateway for West US Region
Using Connection type VNet-to-VNet, I connected both Virtual Network Gateway from both sides.
I created connection between both Virtual Network Gateway.
The status of both connections says, Connected.
Windows Server Domain Controller is set up at East US and Windows 10 is installed at West US.
Windows 10 is unable to ping and join the Windows Server Domain Controller.
While joining the Domain Controller, the error message is
The issue is
I am able to connect both VMs which is at two different VNets using RDP with Public IP.
Both VMs’ virtual network gateways are also connected to each other through Connections.
I am able to connect one VM from another using RDP with Private IP.
But I am not able to join Windows 10 VM to Windows Server 2016 Domain Controller.
I request please go through the link https://1drv.ms/u/s!Ail_S1qZOKPmlgBU5fLviInoisrx?e=ImrqpL and help me to fix the issue related to VNet-to-Vnet Connection so that Windows 10 VM from one VNet can join the Windows Server 2016 Domain Controller VM which is at another VNet.
I hope you'll consider it positively.
Regards
TekQ
You might have to create routes, you are not using recommended private address space so routes are not created for you.
Azure automatically creates default routes
for the following address prefixes: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16: Reserved for private use in RFC 1918.
100.64.0.0/10: Reserved in RFC 6598.
Check the effective routes to seen next hop for traffic in the peering address space.
https://learn.microsoft.com/en-us/azure/virtual-network/diagnose-network-routing-problem
Additional Information on VNet Routing
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview
Instead of rely on Vnet Gateway and VPN S2S, you could as well using Vnet Peering between region.
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-peering-overview
I agree with the other answers. Global VNet Peering would remove the necessity of using a VPN GW, which greatly simplifies the environment and removes the monthly cost of hosting a pair of GWs. Assuming you need those GWs for other connections to VPN devices on-premises, then you can still use this design.
As Hannel pointed out, you're using public ranges for your private networks. That is also okay, but routing would be affected for VMs in those subnets if they attempted to go to actual public IPs in those ranges. Note that Hewlett Packard owns large parts of those ranges, so if your VM needed to get info from an HP website, you would have to create manual UDRs to route that traffic to Next Hop Internet.
So, please do check your Effective Routes on your NICs. You can check this from the NIC and also from Network Watcher. This should help you identify if another route is taking precedence or even if you have a route sending traffic to a virtual appliance.
Do make sure that you chose VNet-to-VNet when you set up your connection. If you chose IPSec, then you would need to have correctly configured your local network gateways.
If two vnets are connected to each other via multiple set of peering vnets, how does azure route the traffic? Fo example, lets consider the below: A, B, C, D are 5 VNets and the they are peered (bi-directionally with traffic forwarding allowed).
Now if A wants to send a packet to D, how it is determined whether it will take the A-B-C-D path or the A-E-D path?
Any docs will be helpful.
As far as I know, VNet Peering connections are non-transitive. It seems that it's still on the roadmap. See the feedback here.
From your picture, If only VNet Peering connections between them, then A could not reach D, also A could not reach C. A only could reach direct-connected B and E.
If you want to allow much VNets communication. You could implement a hub-spoke network topology in Azure. As the hub network, you could deploy a VPN gateway then enable allow gateway transit to other spoke VNets and enable use remote gateways in each spoke VNets. If you require connectivity between spokes, consider implementing an NVA for routing in the hub, and using UDR(custom routes) in the spoke to forward traffic to the hub. In this scenario, you must configure the peering connections to allow forwarded traffic.
VNet Peering enables you to connect VNets through the Azure backbone network. Azure automatically creates a route table for each subnet within an Azure VNet and adds system default routes to the table. You can also override some of Azure's system routes with custom routes.
If multiple routes contain the same address prefix, Azure selects the
route type, based on the following priority:
User-defined
route BGP route
System route
You could get more details about Virtual network traffic routing
According to this article you'd need an NVA somewhere, vnet peering is non transitive.
At the beggining of the same article they talk a bit more about this.
To sum it up. packet wont reach D from A unless you fix your networking setup
Some years ago but i think service chaining allows that as far as i understand the documentation
To enable service chaining, configure user-defined routes that point
to virtual machines in peered virtual networks as the next hop IP
address. User-defined routes could also point to virtual network
gateways to enable service chaining.
I have one Vnet (VNet1) in region 1 which is connected to on-premises using s2s VPN. I have got this peered with a second Vnet (Vnet2) in the same region following hub-spoke network pattern. VNet2 is configured to use Vnet1 Gateway transit for on-premises connectivity.
Now I have a third Vnet (Vnet3) in region3 which is also a spoke for Vnet1. Since this is in a different region I used VNet-VNet VPN (since Global Vnet peering doesn't support transitive gateway.) I reused the existing VPN that was used for S2S on Vnet1 for the Vnet1-Vnet3 connectivity.
The question is how do I support transit Gateway feature from VNet3->Vnet1 to achieve on-premises connectivity? To test it out I have setup UDR to route all traffic from Vnet3 to VPN Gateway. So this should bring the traffic to Vnet1. But this doesn't allow me to reach on-premises. Shouldn't Vnet1 routes know that the traffic is for on-premises and route it accordingly? Do I need some kind of NVA in Vnet1?
Any help would be appreciated.
If you want to create multi VPNs between the vnets, first you should take care and pay attention to the limitations of it. See limitations for multi VPN. And you also can follow the steps to create the multi VPNs.
Can someone let me know when Microsoft Azure introduced Vnet Peering? I'm working with a company that has introduced a number of Vnets (8 Vnets) for security. I'm trying to suggest that creating that number of Vnets is unnecessary.
I just would like to know if there are any other benefits to Vnet peering and when it was first introduced by Azure?
Cheers
Carlton
I just would like to know if there are any other benefits to Vnet
peering and when it was first introduced by Azure?
Virtual network peering enables you to connect two virtual networks in the same region through the Azure backbone network. Once peered, the two virtual networks appear as one, for connectivity purposes. The two virtual networks are still managed as separate resources, but virtual machines in the peered virtual networks can communicate with each other directly, by using private IP addresses. More information about this please refer to this link.
I'm trying to suggest that creating that number of Vnets is
unnecessary.
It depends on your company's need. If you want to connect two Vnets, you must create a peering tunnel.
VNet peering is between two virtual networks, and there is no derived transitive relationship.
In others words, if you want 3 VNets to be both interconnected, you need create 3 peering tunnels. Please refer to the similar question.
We announced peering in September 2016. See our service update for reference: https://azure.microsoft.com/en-us/updates/vnet-peering-ga/
VNet peering has many benefits: low latency, high bandwidth, direct VM to VM connectivity among others. You can see a comprehensive list here: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-peering-overview
You can also suggest using subnets in the same virtual network: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-create-vnet-arm-pportal
-- Anavi N [MSFT]