Tue April 9

packets & protocols using wireshark

Here are some we may want to discuss and/or look for ...

• ARP
• DNS
  • 1.1.1.1
• SSH (includes scp)
• List of TCP & UDP port numbers
• SMTP
• IMAP
• POP
• HTTP
• SSL | HTTPS etc
• NTP

    $ arp -a                       # list arp cache
    $ host cs.marlboro.college     # issue DNS to do lookup
    $ dig cs.marlboro.college      # similar, can specify server
    $ cat /etc/resolv.conf         # DNS config (unix)
    $ scutil --dns                 # DNS config (mac)
    $ ssh mahoney@shannon.marlboro.college
    $ scp file mahoney@shannon.marlboro.college:

asides

• You are not Google | hackernews discussion
• The unreasonable effectiveness of SQL | hackernews discussion
• stackoverflow developer survey 2019 | hackernews discussion