Ice Breaking Topics

• "Would you prefer to live in a place that has just one, warm season that
• lasts the whole year or a place with different seasons?"
• What makes you dislike a person?
• Do people trust you easily?
• What’s your favorite animal, and why do you find it interesting?
• What is your favorite childhood memory?
• Would you like to be famous? In what way?
• Does your name have any special meaning?
• Do you believe there a cosmic significance to incidents in life?

Ice Breaking Topics

• Do you prefer spending time alone or with others? Why?
• What would you do if you could change one decision you made in the past?
• What's a day in your life like?
• What's your least favorite thing about your culture, and why?
• What is your favorite board game or card game?
• What would you do if you woke up one day and everyone had disappeared except for you?
• Do you think modern lifestyles give people enough time for leisure?
• "What do you think are the good points and the possible bad points about
• having leisure time?"

Ice Breaking Topics

• Have you ever tried any adventure sports?
• What would you do if you could switch lives with any fictional character for a day?
• What is your favorite board game?
• Who is your biggest hero? Why?
• What would you do if you found out that your best friend was actually an alien?
• What’s the most unique thing you've ever eaten, and what did it taste like?
• When someone is feeling stressed, what are 3 suggestions you'd share with them?
• Do you sometimes find yourself turning into the person you don't like?

Ice Breaking Topics

• What is your favorite board game or card game?
• Do you believe in the law of attraction?
• What is your favorite type of fish?
• If you could have any piece of technology from any time period, what would it be and why?
• Do you like to camp? If so, where is your favorite place to camp?
• What is the most difficult decision you've ever had to make?
• What's the most interesting project you've worked on, and what did you learn from it?
• What is one place you would love to visit but haven't yet?

Ice Breaking Topics

• What kinds of movies do you like best?
• What animal scares you the most?
• How do like going to movies - alone or with a significant other/friend/family?
• How do you make your coffee?
• How do you usually spend your evenings?
• Is there someone that you hate?
• When do you decide to break off a friendship?
• What makes your family amazing?

监视指定主机的数据包

打印所有进入或离开sundown的数据包.

tcpdump host sundown

也可以指定ip,例如截获所有210.27.48.1 的主机收到的和发出的所有的数据包

tcpdump host 210.27.48.1 

打印helios 与 hot 或者与 ace 之间通信的数据包

tcpdump host helios and ( hot or ace )

截获主机210.27.48.1 和主机210.27.48.2 或210.27.48.3的通信

tcpdump host 210.27.48.1 and (210.27.48.2 or 210.27.48.3 ) 

打印ace与任何其他主机之间通信的IP 数据包, 但不包括与helios之间的数据包.

tcpdump ip host ace and not helios

如果想要获取主机210.27.48.1除了和主机210.27.48.2之外所有主机通信的ip包，使用命令：

tcpdump ip host 210.27.48.1 and ! 210.27.48.2

截获主机hostname发送的所有数据

tcpdump -i eth0 src host hostname

监视所有送到主机hostname的数据包

tcpdump -i eth0 dst host hostname

问题来源于raspberry pi4 安装了打印服务，但是cups服务有点异常报，/etc/securetty找不到。
查了下应该是ubuntu 20.04的bug.

root@ubuntu:~# systemctl status cups
● cups.service - CUPS Scheduler
     Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2020-07-01 00:58:26 CST; 12min ago
TriggeredBy: ● cups.path
             ● cups.socket
       Docs: man:cupsd(8)
   Main PID: 8324 (cupsd)
      Tasks: 2 (limit: 4434)
     CGroup: /system.slice/cups.service
             ├─8324 /usr/sbin/cupsd -l
             └─9318 /usr/lib/cups/notifier/dbus dbus://

Jul 01 01:08:15 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:15 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:22 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:22 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:27 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:27 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:29 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:29 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:39 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory
Jul 01 01:08:39 ubuntu cupsd[8324]: pam_unix(cups:auth): Couldn't open /etc/securetty: No such file or directory

解决的办法就是新建这个文件/etc/securetty，内容为