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Category Archives: Networking
Capture Network Traffic with netsh trace command
A very useful netsh capture command when you are not able to install Wireshark or Micorosft Network Monitor app inside a server. Windows has a built in command that allows you to capture network traffic. To start capturing (Run command … Conti...
Powershell script to test TCP port connectivity
I recently ran into an issue where a site kept going up and down and it was difficult to determine where the issue is. I used the script to validate if the F5 load balanced VIP was going down or … Continue reading →...
Posted in Networking, Scripting Tagged Automate telnet port testing on Windows 7 10 server using batch script, automating telnet session using bash scripts, Bash script telnet to test multiple addresses and ports, Batch file telnet test if a port is open, How can I automate Telnet port checking in Powershell?, Test from shell script if remote TCP port is open, test tcp port using a script, Use PowerShell to test that a port is open on a server Leave a comment
How to redirect a port using netsh interface portproxy command in Windows
When you run the below command on your local desktop. -Your Desktop will start to listen on port 443 on all IPs (0.0.0.0) -Any connection that comes to your Desktop IP on port 443 will be forwarded to the following … Continue reading →...
Citrix Netscaler: Configuring HTTPS load balancing
I finally got a chance to set up and configure a Citrix Netscaler appliance to load balance two websites. In this setup the Netscaler will load balance two SSL (HTTPS) web servers with end-to-end encryption. I did run into some … Continu...
Posted in Networking Tagged Citrix NetScaler - Simple HTTP Site Load Balancing, Configuring SSL Offloading with End-to-End Encryption, How Do I Configure end-to-end SSL on NetScaler, set up step by step load balancing in netscaler citrix web sites web servers, setting up basic https load balancing netscaler vpx 1000 5 Comments
iPerf Network performance comparison between Virtual Machines on ESXi6
I finally found some time to run a series of iPerf network performance tests between Windows server 2008 R2, Windows 2012 and a Linux Debian virtual machines. The tests compare bandwidth throughput between vmxnet3, e1000 going through a 1Gbit and &he...
Posted in Linux, Networking, VMware Tagged bandwidth performance test vmware vsphere 6, change default window size linux tcp stack, comparison between e1000 vmxnet3 1gbit 10gbit jumbo frames mtu 9000, esxi slow network performance, iperf linux TCP window size: 1.00 MByte (WARNING: requested 512 KByte), network throughput performance, tcp tunning linux vm increase default window size, vm to vm network throughput, vmware iperf tests esxi6 1 Comment
How to set up a Microsoft Network Load Balancing (NLB) in Windows 2008 R2
OVERVIEW Here is a quick guide how to set up two Web Servers that will be serving out the same web page for redundancy and load balancing purposes. When we go to www.mywebsite.com address, the name will resolve to the Load Balancing … Cont...
Netstat script that runs every 60 seconds and counts open connections
Here is a quick NETSTAT script that runs every 60 seconds and appends the output to c:\ports\netstat.txt. The script exports the count of connections in a specific state. The output is very similar to what TcpView shows you at the bottom of &he...
Posted in Networking, Scripting Tagged netstat runs every minute and logs open ports, netstat script that runs on an interval, netstat script TIME_WAIT ESTABLISHED CLOSE_WAIT LISTENING ALL OPEN PORTS, netstat script to count ephemeral ports, run netstat as a scheduled task, script to log network connections Leave a comment
Set up and troubleshoot SNMP on an ESXi 5.5 host
Here are some quick notes how to troubleshoot and set up SNMP on an ESXi host. The below also includes how to install snmpwalk and request info from an snmp server. STEPS HOW TO PROPERLY SET UP SNMP ON AN … Continue reading →...
Posted in Linux, Networking, Scripting, VMware Tagged configuring snmp traps in esx/esxi 5.5, Continuous snmpwalk command, esxi snmp settings, how to set up snmp on esxi 5.1, how to test snmp polling on esxi host, snmpget and snmp plling not working esxi 5.5, snmpwalk -v 2c -O n -c public, Timeout: No Response from, troubleshoot snmp server polling snmpwalk esxi vcenter mib Leave a comment