Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
2,463 questions
Azure VM network NAT not working
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(208, 20%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBK%3C/text%3E%3C/svg%3E)
Brian Koch
1
Reputation point
So I have a VM in azure for a firewall. Azure config shows the public IP should be 20.x.x.x. I have a few IPSEC tunnels already configured and working. I've had issues with connecting via IPSec VPN to a new site. Finally as a troubleshooting step, I've configured an IPSec VPN tunnel to another firewall that I have visibility into (63.y.y.y) . This VPN tunnel won't connect either. When I checked the debug logs, it shows on firewall 63.y.y.y that i'm receiving packets from 20.z.z.z instead of 20.x.x.x. I'm at a loss on this behavior.
{count} votes
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Bruno Lopes 26 Reputation points2022-02-05T00:29:29.837+00:00 @Brian Koch Can you give more details? Your scenario is a little confusing.
Is it possible to share the logs?I'm not thinking that your problem is the NAT, for this case. Do you use NSG to control the VM connections?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(48, 36%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESM%3C/text%3E%3C/svg%3E)
SaiKishor-MSFT 17,236 Reputation points2022-02-08T21:05:53.803+00:00 @Brian Koch Please do share more details as requested so we can understand and assist better. Thank you!
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