acrolinx

Author: asudbring

articles/virtual-network/virtual-network-troubleshoot-nva.md

@@ -14,9 +14,9 @@ ms.author: allensu
 
 [!INCLUDE [updated-for-az](~/reusable-content/ce-skilling/azure/includes/updated-for-az.md)]
 
-You may experience VM or VPN connectivity issues and errors when using a third party Network Virtual Appliance (NVA) in Microsoft Azure. This article provides basic steps to help you validate basic Azure Platform requirements for NVA configurations.
+You might experience VM or VPN connectivity issues and errors when using a partner Network Virtual Appliance (NVA) in Microsoft Azure. This article provides basic steps to help you validate basic Azure Platform requirements for NVA configurations.
 
-Technical support for third-party NVAs and their integration with the Azure platform is provided by the NVA vendor.
+Technical support for partner NVAs and their integration with the Azure platform is provided by the NVA vendor.
 
 > [!NOTE]
 > If you have a connectivity or routing problem that involves an NVA, you should [contact the vendor of the NVA](https://mskb.pkisolutions.com/kb/2984655) directly.
@@ -35,9 +35,9 @@ Technical support for third-party NVAs and their integration with the Azure plat
 
 - Routing tables and rules within the NVA (for example, from NIC1 to NIC2)
 
-- Tracing on NVA NICs to verify receiving and sending network traffic
+- Tracing on NVA network interfaces to verify receiving and sending network traffic
 
-- When using a Standard SKU and Public IPs, there must be an NSG created and an explicit rule to allow the traffic to be routed to the NVA.
+- Use of a Standard version Public IP. There must be an NSG created and an explicit rule to allow the traffic to be routed to the NVA.
 
 ## Basic troubleshooting steps
 
@@ -73,7 +73,7 @@ Each NVA has basic configuration requirements to function correctly on Azure. Th
 
 1. Check the **EnableIPForwarding** property.
 
-1. If IP forwarding is not enabled, execute the following commands to enable it:
+1. If IP forwarding isn't enabled, execute the following commands to enable it:
 
    ```powershell
    $nic2 = Get-AzNetworkInterface -ResourceGroupName <ResourceGroupName> -Name <NicName>
@@ -90,23 +90,23 @@ Each NVA has basic configuration requirements to function correctly on Azure. Th
 
 **Check for NSG when using Standard SKU public IP**
 
-When using a Standard SKU and public IPs, there must be an NSG created and an explicit rule to allow the traffic to the NVA.
+Use of a standard version of public IPs. There must be an NSG created and an explicit rule to allow the traffic to the NVA.
 
 **Check whether the traffic can be routed to the NVA**
 
 1. On [Azure portal](https://portal.azure.com), open **Network Watcher**, select **Next Hop**.
 
 1. Specify a VM that is configured to redirect the traffic to the NVA, and a destination IP address at which to view the next hop. 
 
-1. If the NVA is not listed as the **next hop**,  check and update the Azure route tables.
+1. If the NVA isn't listed as the **next hop**,  check and update the Azure route tables.
 
 **Check whether the traffic can reach the NVA**
 
 1. In [Azure portal](https://portal.azure.com), open **Network Watcher**, and then select **IP Flow Verify**. 
 
-1. Specify the VM and the IP address of the NVA, and then check whether the traffic is blocked by any Network security groups (NSG).
+1. Specify the VM and the IP address of the NVA. Check for traffic blockage by any Network security groups (NSG).
 
-1. If there is an NSG rule that blocks the traffic, locate the NSG in **effective security** rules and then update it to allow traffic to pass. Then run **IP Flow Verify** again and use **Connection troubleshoot** to test TCP communications from VM to your internal or external IP address.
+1. If there's an NSG rule that blocks the traffic, locate the NSG in **effective security** rules and then update it to allow traffic to pass. Then run **IP Flow Verify** again and use **Connection troubleshoot** to test TCP communications from VM to your internal or external IP address.
 
 **Check whether NVA and VMs are listening for expected traffic**
 
@@ -124,17 +124,17 @@ When using a Standard SKU and public IPs, there must be an NSG created and an ex
    netstat -an | grep -i listen
     ```
 
-1. If you don't see the TCP port that's used by the NVA software that's listed in the results you must configure the application on the NVA and VM to listen and respond to traffic that reaches those ports. [Contact the NVA vendor for assistance as needed](https://mskb.pkisolutions.com/kb/2984655).
+If the TCP port used by the NVA software isn't listed in the results, configure the application on the NVA and VM to listen on those ports. For further assistance, [contact the NVA vendor](https://mskb.pkisolutions.com/kb/2984655).
 
 ## Check NVA performance
 
 ### Validate VM CPU
 
-If CPU usage gets close to 100 percent, you may experience issues that affect network packet drops. Your VM reports average CPU for a specific time span in the Azure portal. During a CPU spike, investigate which process on the guest VM is causing the high CPU, and mitigate it, if possible. You may also have to resize the VM to a larger SKU size or, for virtual machine scale set, increase the instance count or set to auto-scale on CPU usage. For either of these issues, [contact the NVA vendor for assistance](https://mskb.pkisolutions.com/kb/2984655), as needed.
+If CPU usage gets close to 100 percent, you might experience issues that affect network packet drops. Your VM reports average CPU for a specific time span in the Azure portal. During a CPU spike, investigate which process on the guest VM is causing the high CPU, and mitigate it, if possible. You might also have to resize the VM to a larger SKU size or, for virtual machine scale set, increase the instance count or set to autoscale on CPU usage. For either of these issues, [contact the NVA vendor for assistance](https://mskb.pkisolutions.com/kb/2984655), as needed.
 
 ### Validate VM network statistics
 
-If the VM network use spikes or shows periods of high usage, you may also have to increase the SKU size of the VM to obtain higher throughput capabilities. You can also redeploy the VM by having Accelerated Networking enabled. To verify whether the NVA supports Accelerated Networking feature, [contact the NVA vendor for assistance](https://mskb.pkisolutions.com/kb/2984655), as needed.
+If the VM network use spikes or shows periods of high usage, you might also have to increase the SKU size of the VM to obtain higher throughput capabilities. You can also redeploy the VM by having Accelerated Networking enabled. To verify whether the NVA supports Accelerated Networking feature, [contact the NVA vendor for assistance](https://mskb.pkisolutions.com/kb/2984655), as needed.
 
 ## Advanced network administrator troubleshooting
 
@@ -144,19 +144,23 @@ Capture a simultaneous network trace on the source VM, the NVA, and the destinat
 1. To capture a simultaneous network trace, run the following command:
 
    **For Windows**
-
+    
+    ```console
    netsh trace start capture=yes tracefile=c:\server_IP.etl scenario=netconnection
+    ```
 
    **For Linux**
 
+   ```console
    sudo tcpdump -s0 -i eth0 -X -w vmtrace.cap
+    ```
 
 1. Use **PsPing** or **Nmap** from the source VM to the destination VM (for example: `PsPing 10.0.0.4:80` or `Nmap -p 80 10.0.0.4`).
 
 1. Open the network trace from the destination VM by using [Network Monitor](https://download.cnet.com/s/network-monitor) or tcpdump. Apply a display filter for the IP of the Source VM you ran **PsPing** or **Nmap** from, such as `IPv4.address==10.0.0.4 (Windows netmon)` or `tcpdump -nn -r vmtrace.cap src or dst host 10.0.0.4` (Linux).
 
 ### Analyze traces
 
-If you do not see the packets incoming to the backend VM trace, there is likely an NSG or UDR interfering or the NVA routing tables are incorrect.
+If you don't see the packets incoming to the backend VM trace, there's likely an NSG or UDR interfering or the NVA routing tables are incorrect.
 
-If you do see the packets coming in but no response, then you may need to address a VM application or a firewall issue. For either of these issues, [contact the NVA vendor for assistance as needed](https://mskb.pkisolutions.com/kb/2984655).
+If you do see the packets coming in but no response, then you might need to address a VM application or a firewall issue. For either of these issues, [contact the NVA vendor for assistance as needed](https://mskb.pkisolutions.com/kb/2984655).