network

HOW TO : Troubleshoot Zscaler client

I recently encountered some connectivity issues while working from home and trying to access some corporate resources. Notes for myself on some tips our infosec team shared to troubleshoot the Zscaler client since all the traffic to the interweb gets routed through it.

  • http://speedtest.zscaler.com/perf
    • Gives you an overview of which Zscaler pop you are connecting to and access speed to the Internet via that pop.
  • http://127.0.0.1:9000/?ztest?q=@YOUR-CORPORATE-DOMAIN (ex: google.com)
    • This provides a detailed report, including:
      • DNS Reachability Test: Confirms if DNS is resolving correctly.
      • UDP Connectivity Test: Checks if UDP packets can pass through.
      • TraceRoute to Zscaler: Shows the path your data takes to reach Zscaler.
      • Throttling Test: Identifies any speed drops.
      • Download/Upload Bandwidth: Measures the speed at which data transfers.
  • https://ip.zscaler.com
    • A quick utility to check where and how your traffic is routed through the Zscaler network. Very similar to the perf test data, but doesn’t let you run a performance test.

October 24, 2024 by Uncategorized 0

HOW TO : count lines in windows command line

Say you are using netstat to checl all established network connections on a windows machine (confirmed to work on windows 7+ and windows server 2008+) and want to find out how many connections you have, you can use

netstat -an | find "ESTABLISHED" | find /v /c ""

breaking down the command string

netstat -an : Uses netstat command to display all connections and listening ports (-a) and displays them in numerical form instead of resolving DNS or using common names (-n)

| : piping (passing) output of one command to the next one

find “ESTABLISHED” : Uses find command to filter out to just lines that contain the string “ESTABLISHED”‘

find /c /v “” : exclude blank lines (/v “”) and count the number of remaining lines (/c)

If you wanted to something similar in linux, you can use

netstat -an | grep "ESTABLISHED" | wc -l
May 30, 2016 by HOWTO Technology Uncategorized Windows 0