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[NET] Capture Network Trace

April 29, 2019 No comments

Capturing Network Trace

  1. Open elevated CMD
  2. Run: netsh trace start persistent=yes capture=yes tracefile=c:\temp\nettrace-boot.etl”
  3. Reproduce the issue
  4. Open elevated CMD
  5. Run: netsh trace stop

Note: For boot issues, run step 1-2, reboot* and then continue.

Converting ETL to Wireshark (.CAP)

  1. Download and install Microsoft Network Analyzer
  2. Open the ETL file
  3. Select Save as .CAP
Categories: Networking, OS Tags:

[NET] Domain Name System (DNS)

January 27, 2017 No comments

DNS stands for domain name system – It is one of the most frequently asked interview questions when applying for a job in Information Technology (IT).

DNS controls your domain’s website and e-mail configurations and settings. When someone visits your website/domain like tecism.com, the DNS record controls which name server (NS record) it reaches out to resolve the destination. You can also think of DNS like a phone book for the internet or intranet (internal private network). DNS associates the IP with the domain name and host-names. Imagine remembering the IP address: 64.90.40.22 when you can just visit tecism.com or https://tecism.com, its a lot easier to remember than IP Addresseses.

For example tecism.com, reaches out to a name server (NS record) hosted by dreamhost.com (see reverse dns lookup: http://mxtoolbox.com/) Notice the nameservers points to ns1.dreamhost.com, ns2.dreamhost.com, and ns3.dreamhost.com.

DNS is made up of several elements which control different aspects of a domain name including the

  • name server
    zone file
    a record
    cname
    mx record
    and commonly text record
  • Categories: Networking Tags: