In pursuit of mastering Redis, I embarked on hands-on learning within a Linux environment, opting for CentOS 7 as my experimental platform. I set up a virtual machine (VM) using VMware to practice various Linux commands without disrupting my primary operating system. Initially, I established a bridge connection between my physical host and the VM, which functioned smoothly as long as I was in an optimal network setting. However, the inconsistent Wi-Fi signal at home led to recurrent disconnections during SSH sessions, significantly hampering my learning process.
To circumvent this issue, I decided to abandon the bridge network configuration in favor of NAT mode. This approach allows VMware to emulate a network environment complete with routing and DHCP services. By doing so, even under weak external Wi-Fi signals, the stability of my SSH connections would remain intact, ensuring uninterrupted learning.
However, upon switching to NAT mode, I encountered a new obstacle. The physical host could no longer establish an SSH connection to the VM. Testing connectivity via ping commands failed to yield any response. Curiously, while the VM could successfully ping www.baidu.com, indicating internet access, it could not communicate with devices within the virtual LAN, VMnet8.
After extensive online research, I stumbled upon a potential solution that deviated from common practices: toggling the Jumbo Packet setting from “Disabled” to “Enabled.” Despite being an unconventional approach, I decided to give it a try. To my delight, this method proved effective!
Unfortunately, the relief was short-lived. Following a routine shutdown and reboot, I found myself once again facing connectivity issues. Reverting the Jumbo Packet status back to “Disabled” restored the connection. This led me to hypothesize that the actual resolution was not tied to the Jumbo Packet state change, but rather to the possible restart of VMnet8 triggered by this action.
Based on this hypothesis, I conducted another experiment: after shutting down and restarting the computer, instead of manipulating the Jumbo Packet setting, I opted to directly restart VMnet8. As anticipated, the SSH connectivity problem vanished upon restarting VMnet8, allowing me to log into the VM and resume my studies without hindrance.
Additional Note: For users who, like me, require frequent network adapter restarts to maintain stable connections, employing batch scripts can simplify the process. Instructions on how to restart network adapters (network adapters) using Windows cmd command prompts can be found in relevant tutorials.
Summary
Restarting VMnet8 effectively resolves the issue where a VM can access the internet but fails to connect to the host, ensuring that learning and work are not disrupted by network fluctuations.