Tag: network
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Cannot log in to Microsoft Account over VPN
I could not log in to any Microsoft account when using a VPN. The solution is to add the Your account to the loopback exemption. However, I’ll explain the reason in this post.
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Disable DHCP Service for VMware Fusion in Big Sur
My home lab virtual machines are connected on private network 192.168.1.x. All internet traffic goes to a gateway server and is forwarded over the internet network adapter. The gateway server is a DHCP server also to assign IP addresses to my lab devices. The benefit to use my own DHCP server is I can control…
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Password is incorrect when access admin$ or c$ on Windows
There are default shares for administration purposes on Windows. You can access it by //computer name/admin$ or //computer name/c$. I faced a problem on some machines that it cannot access the shared paths.
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Quick Notes: Windows lost network every 20 minutes
You may see a Windows machine lost network connectivity every 20 minutes, or the Windows machine lost network when you are connecting it via RDP.
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Private IP Address Routes to L3 Subnet on Dual vNIC VM
It’s not easy for me to describe the issue in one line on the title. Let me give some background here. I have 2 set of VMs. Set 1 has VM A & VM B. Set 2 has VM C & VM D. Each VM has a vNIC configured with a private IP address. VM…
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Emulex OneConnect OCe10102 on ESXi 6.0
Please refer to following post for basic troubleshooting of Emulex OneConnect. How to Install Proper Drivers for 3rd Party Network Adapter on ESXi 5.x I have a box uses Emulex OneConnect OCe10102 network adapters. The adapter is quite old and Emulex brand card doesn’t support ESXi 6.0. I upgraded the server to ESXi 6.0 and…
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Troubleshooting Network Performance of Virtual Machine
There are several layers of networking on the virtualization infrastructure. Guest operating system, Virtual Machine, ESXi driver, physical network adapters, RJ45/SFP and network switches…etc. Sometimes it’s hard to say where exactly caused a problem. Especially hardware layer problems. Today I worked on a very interesting case, it may give some ideas to troubleshooting network performance…
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虚拟主机无法获得DHCP IP地址
Just a quick post. When virtual machine cannot get DHCP IP address the first thing you want to check is firewall. Whatever Windows firewall or physical firewall. You should make sure UDP port 67 and 68 are not blocked. Otherwise you will see the virtual machine gets 169.x.x.x IP address only. The two ports is…
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Virtual Machine Cannot Get DHCP IP Address
Just a quick post. When virtual machine cannot get DHCP IP address the first thing you want to check is firewall. Whatever Windows firewall or physical firewall. You should make sure UDP port 67 and 68 are not blocked. Otherwise you will see the virtual machine gets 169.x.x.x IP address only. The two ports is…
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Network Latency on Virtual Machine
Slight network latency may cause application problem on sensitive virtual machines. Even the network responding time is just 3 or 7 ms. There is a way to improve the stability of responding latency – Enable RSS on NIC. Network traffic is handled by single CPU core when RSS is disabled. Enable it will distribute the…