NAT连接下从主机访问VM中IIS托管网页失败求助

Hey there, let’s work through your network issues together—since you’re new to this, I’ll keep each step straightforward and actionable.

1. Fix the VM’s Internet Access First #

If your VM can’t reach the internet, that’s a red flag that the network configuration is off. Let’s start here:

• Correct the Default Gateway for NAT Adapters
  You mentioned setting the VM’s gateway to your host’s physical network gateway, but that’s not how NAT mode works. NAT virtual networks have their own internal gateway managed by your virtualization software (VMware, VirtualBox, Hyper-V, etc.). For example:
  • VMware Workstation’s default NAT gateway is usually 192.168.x.2 (replace x with your NAT network’s subnet)
  • VirtualBox’s default NAT gateway is typically 10.0.x.1
    Check your virtualization software’s NAT network settings to find the correct gateway IP, then update your VM’s static IP configuration to use this gateway instead of your host’s physical gateway.
• Validate DNS Settings
  Double-check the DNS server IP your teacher provided—if it’s incorrect, the VM won’t resolve domain names. As a test, temporarily set the VM’s DNS to 8.8.8.8 (Google’s public DNS) and see if you can ping google.com. If that works, the issue is with the teacher’s DNS IP.
• Confirm Adapter Types
  Are both of your VM’s adapters set to NAT? If you’re using two adapters for separate websites, consider using one NAT adapter (for internet access) and one Host-Only adapter (for direct host-VM communication). This avoids subnet conflicts and simplifies routing.

2. Resolve Host-VM Connectivity (Ping & IIS Access) #

Once the VM can access the internet, let’s fix the host’s inability to ping the VM or reach your IIS sites:

• Adjust Windows Firewall on the VM
  Windows Server 2019’s firewall blocks ICMP (ping) and HTTP requests by default. You need to create two inbound rules:
  1. Allow ICMPv4 (Ping)：Open Windows Defender Firewall > Advanced Settings > Inbound Rules > New Rule. Select "Custom", then "ICMPv4", and allow the connection for your host’s subnet (or all IPs for testing).
  2. Allow HTTP Traffic：IIS usually creates this rule automatically, but if it’s missing, create a new inbound rule allowing TCP port 80 (or 443 if using HTTPS) for all IPs or your host’s subnet.
• Verify Hosts File Changes
  Make sure your host’s hosts file entry is formatted correctly—no extra spaces, just:

  192.168.1.15    yourwebsite.com
  

  After saving, flush your host’s DNS cache with this command in Command Prompt:
  ipconfig /flushdns
• Check for Subnet Conflicts
  If your host’s physical network is already using the 192.168.1.x subnet, assigning the same subnet to your VM’s NAT adapter can cause routing chaos. Your virtualization software’s NAT network should use a different subnet (e.g., 192.168.2.x) to avoid conflicts.

3. Troubleshooting Commands to Run #

Run these commands to get more details about what’s going wrong:

On the VM: #

• ipconfig /all: Check that your static IP, gateway, and DNS settings are correctly applied (no DHCP overrides).
• ping 8.8.8.8: Tests basic internet connectivity. If this works but ping google.com doesn’t, it’s a DNS issue.
• tracert 8.8.8.8: Tracks the route to Google’s DNS—if it stops at the gateway, your VM can’t reach the NAT gateway.

On the Host: #

• ping 192.168.1.15: Confirm if the host can reach the VM’s IP. If it fails, run tracert 192.168.1.15 to see where the connection breaks.
• Check your host’s firewall: Ensure it’s not blocking outbound traffic to the 192.168.1.x subnet.

If you’re still stuck, share what virtualization software you’re using (VMware, VirtualBox, Hyper-V) and the full output of ipconfig /all from both the host and VM—this will help narrow things down faster.

内容的提问来源于stack exchange，提问作者angelcb9