I have an issue with Google Cloud VPN and tunneling to a peer VPN. The tunnel is up and running but I cannot connect to any points on the peer network from my GCE VM.
My setup looks like the following:
A custom VPC network with one interal IP-range. Let's call it custom-net
A classic VPN Gateway with a IPSec tunnel to a peer VPN. The tunnel has status Established. The VPN Gateway has a Reserved IP address to it. The VPN Gateways VPC network is custom-net.
Three routes on custom-net:
Local route to the only subnet, prio 1000
To default internet gateway, prio 900
To the gateway tunnel, prio 1000
A fresh Linux VM in GCE. Let's call it vm1. It has one network interface on custom-neton its only sub network.
Two firewall rules in GC that allow everything Ingress and Egress.
I can connect to vm1 with ssh and access the internet from it, but I cannot access any points in the peer VPN despite the tunnel being status Established. The IP-range on custom-net does not interfere with any ranges on the peer network.
What could be the issue here? I'm novice in network setups. Could it be something missing in the routing, or do I have to do some configuration in vm1 to get this to roll?
Any help appreciated!
For the routes Google Cloud automatically creates one route for each remote IP range you specify. This shouldn't be an issue
That said, several points can be checked to further troubleshoot this:
If you use policy based tunnel make sure the ip addresses you are trying to reach are declared in your traffic selectors. Moreover check on stackdriver logs for the tunnel, to see if the aforementioned IP ranges are being negotiated. You can use this advanced filter:
resource.type="vpn_gateway"
resource.labels.gateway_id="your_gateway_id"
textPayload="established"
Kindly expand the logs and check in the “textPayload:” field to see if the destination ip range is being negotiated.
Confirm you can ping the Remote Peer Gateway from VMs in gcp
Run mtr from both sides and see where packets are being dropped at some point.
Get tcpdumps from the remote gateway and another from the Google Compute Engine Instance while doing connectivity tests(ping, mtr) so you can analyze packet flow.
See the VPN Interop Guides page for guides that describe some supported third-party VPN devices and services. This may give you some tips on how to configure specific devices to work with Cloud VPN.
Consult Cloud VPN Troubleshooting for additional details
I hope this helps
Related
I have an Azure Windows Virtual Machine where I have enabled the Inbound Rule Port 8080 under Network Security Group. However, when I try to check the connectivity from my Windows Machine to Azure VM it fails. I used the below command.
>telnet <public_ip_address_of_the_vm> 8080
Connecting To XX.XXX.XXX.XXX...Could not open connection to the host, on port 8080: Connect failed
Note: The VM is enabled with Public IP Address. How to further troubleshoot this issue?
The first thing to do is ensure the VM is running. Then, look at is the Effective Security Rules for the NIC in question.
If the VM has multiple NICs you need to look at the effective rules for each nic (they can be different).
To run a quick test to determine if traffic is allowed to or from a VM, use the IP flow verify capability of Azure Network Watcher. IP flow verify tells you if traffic is allowed or denied. If denied, IP flow verify tells you which security rule is denying the traffic.
If there are no security rules causing a VM's network connectivity to fail, the problem may be due to:
Firewall software running within the VM's operating system
Routes configured for virtual appliances or on-premises traffic. Internet traffic can be redirected to your on-premises network via forced-tunneling. If you force tunnel internet traffic to a virtual appliance, or on-premises, you may not be able to connect to the VM from the internet. To learn how to diagnose route problems that may impede the flow of traffic out of the VM, see Diagnose a virtual machine network traffic routing problem.
Full Troubleshooting Docs with step-by-step instructions.
I am setting up an Azure VPN Gateway in order for my Azure VM to connect to a remote RTSP feed, following this documentation: https://learn.microsoft.com/fr-fr/azure/vpn-gateway/tutorial-site-to-site-portal.
What I have done:
Create a virtual network + a subnet and a Virtual Machine
Create the VPN Gateway in the same virtual network
Create a local network gateway with the Public IP and IPs range of the remote network that contains the RTSP feeds
Create the site to site VPN connection with needed shared access key.
The status of the VPN connection is "connected", as you can see in below picture:
Moreover, the subnet on which my azure virtual machine is, is in the same virtual network as the subnet of the VPN Gateway:
From what I understand, as long as the VM is in the virtual network of the Gateway, I should be able to reach the remote network...
Expected behaviour: I should be able to reach the following IP addresses: 192.168.250.30/32 that are on the remote network, from my azure virtual machine.
Actual behavior: From my azure virtual machine, I'm still unable to reach the remote network.
Any ideas where the problem can come from?
If the issue is that the Azure VM's are not getting gateway routes, then a gateway reset should be tried first and the gateway reset needs to be done twice.
Reference :
VPN gateway Reset
References for S2S VPN issues troubleshooting:
S2S VPN cannot connect and stops working
S2S VPN disconnects intermittently
Note : If this doesn’t solve your issue then please reach out to Azure support for more troubleshooting as it may need assisted support by clicking (Support+Help) and creating a technical support request. Please validate your Onprem VPN device as well.
And as Andriy Bilous has mentioned in comments section:
You should see default gateway on your VM routing table. Default Gateway is responsible for routing traffic further. Can you see that
tunnel is UP on your VPN onpremise device.
If no VPN Gateway subnet (10.0.0.0/28) in your VM route table - You may add route to VM using route command. Example: route ADD 10.0.0.0
MASK 255.255.255.240 [Your Gateway IP address]
Here a Data engineer who needs your help to setup a connection to an on-premise environment :)!
I have created a virtual network (10.0.0.0/16) with a default subnet (10.0.0.0/24).
Then I created a (Windows) virtual machine which is connected to the vnet/subnet and has allowed ICMP inbound and outbound rules for the ping test. Ping google.com is no problem.
The next step was to create a Virtual network gateway & Local network gateway to connect to an on-premise environment.
The Local network gateway has an Site-to-site (IPsec) connection to a VPN device from a third party (over which I have no control). Status in the Azure portal = 'Connected'.
The third party is able to ping the Virtual Machine in Azure, the 'data in' property on the VPN connection shows that 2 kb (ping) has been received. So that works!
When i try to send a ping command to the ip-address (within the 'address space' specified from the Local network gateway) the ping command fails (Request timed out.).
After a lot of searching on google/stackoverflow I found out that I need to configure a Route Table in Azure because of the BGP = disabled setting. So hopefully I did a good job configure the Routing Table Routes but still I can't perform a successful ping :(!
Do you guys/girls know which step/configuration I have forgotten or where I made a mistake?
I would like to understand why I cannot perform a successful ping to the on-premise environment. If you need more information, please let me know
Site-to-site (IPsec) connection screenshot/config
Routing Table setup screenshot/config
Routing Table Routes in more detail
If you are NOT using BGP between the Azure VPN gateway and this particular network, you must provide a list of valid address prefixes for the Address space in your local network gateway. The address prefixes you specify are the prefixes located on your on-premises network.
In this case, it looks like you have added the address prefixes. Make sure that the ranges you specify here do not overlap with ranges of other networks that you want to connect to. Azure will route the address range that you specify to the on-premises VPN device IP address. There are no other operations that we can do. We don't need to set UDR, especially we don't associate a route table to the Gateway Subnet. Also, avoid associating a network security group (NSG) to the Gateway Subnet. You can check the route table by selecting Effective routes for a network interface in Azure VM. Read more details here.
If you would like to verify the connection from Azure VNet to an on-premise network, ensure that you PING a real private IP address from your on-premise network(I mean the IP address is assigned to an on-premise machine), you can check the IP address with ipconfig/all in local CMD. Moreover, you could Enable ICMP through the Windows firewall inside the Azure VM with the PowerShell command New-NetFirewallRule –DisplayName "Allow ICMPv4-In" –Protocol ICMPv4. Or, instead of using PING, you can use the PowerShell command Test-NetConnection to test a connection to a remote host.
If the problem persists, you could try to reset the Azure VPN gateway and reset the tunnel from the on-premises VPN device. To go further, you could follow these steps to identify the cause of the problem.
My VNet won't allow me to connect to the s2s location via p2s connection.
I'm trying to connect the Azure VPN client on my machine and reach a site that is allowed in a network which I have a s2s connection to.
Here's the thing, I can't get traffic to flow from my pc running the VPN client, out to the target site.
Topology
PC > VPN Client > VNet via p2s > Remote network via s2s > FTP server
I'd like to be able to ping the FTP server from my machine.
Currently only devices in the VNet can ping.
I tried setting up BGP but it broke the connection, as I don't really know how things should be set.
I don't have access to the remote site or it's devices.
I have a Azure local network gateway which is configured as the s2s location.
I'm sorry if that doesn't make sense.
Edit: here is the picture of the network
BGP is the standard routing protocol which enables the Azure VPN Gateways and your on-premise VPN devices to exchange "routes" that will inform both gateways on the availability and reachability for those prefixes to go through the gateways or routers involved.
To configure the BGP, your on-premise device should also support BGP. Read
What address does Azure VPN gateway use for BGP Peer IP?
What are the requirements for the BGP Peer IP addresses on my VPN device?
What should I specify as my address prefixes for the Local Network Gateway when I use BGP?
Without BGP, If you add the point-to-site addresses after you create your site-to-site VPN connection, you need to update the routes manually. You need to manually add the routes to the remote network on your machine.
For more information, you could refer to configure and validate virtual network or VPN connections. Except the Ping tool, you prefer to use TCping tool, see the detailed steps.
Generally, you could troubleshoot the issue by searching the common issue and solution in the virtual network gateway---Diagnose and solve problems on Azure portal. It's recommended to new a support ticket to get your issue resolved quickly.
My solution to this as I can't enable BPG is to use a proxy server within the VNet.
I have a App service which is in VNET1 and this VNET1 is connected to VNET2 on other network with Point-to-Site Connection. My App Service is connected to VNET1.
These two VNETs are connected and tested. those are working fine.
when i ping (tcpping) from App Service console to VNET1 and VNET2 IP its working fine. Also Curl Request is working fine.
But when i call the Same URL from App service page. its showing Request Time out Error.
Any Suggestions why this is not working?
There are many things that can prevent your app from reaching a specific host and port. Most of the time it is one of three things:
There is a firewall in the way If you have a firewall in the way, you will hit the TCP timeout. That is 21 seconds in this case. Use the tcpping tool to test connectivity. TCP timeouts can be due to many things beyond firewalls but start there.
DNS is not accessible The DNS timeout is three seconds per DNS server. If you have two DNS servers, the timeout is 6 seconds. Use nameresolver to see if DNS is working. Remember you can't use nslookup as that does not use the DNS your VNet is configured with.
Invalid P2S IP range The point to site IP range needs to be in the RFC 1918 private IP ranges (10.0.0.0-10.255.255.255 / 172.16.0.0-172.31.255.255 / 192.168.0.0-192.168.255.255). If the range uses IPs outside of that, then things won't work.
For more details, refer this Troubleshooting steps and see if that helps.