"Social Media for Nerds". by Scott Granneman

7:15pm What "social media" might a nerd or techie want to use? Mastodon? Slack? Discord? TechTV? Twitch? Solaborate? ??? What are the diffs between these and other social media? Why use one rather than another?

Come to MAIN Topic: "Social Media for Nerds".
Presenter: Scott Granneman

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The above main talk is immediately preceded at
~7:05 by
ANNOUNCEMENTS & general Q&A

Which is preceded by ...

6:30pm
BASE/TUTORIAL Topic: An adventure in starting network "sniffing".
WireShark into TCPdump!
Presenter: Grant Taylor & Lee Lammert

Are you just starting to "sniff" to see what is going on at that network interface? Last month we showed an overview of how to start and "get the feel". This month, lets look at some specifics. (This is a tutorial, so if it seems a bit esoteric, we expect folks to ask questions. We hope for a good discussion.)

Our mission tonite is to have Wireshark SSH to a system and run tcpdump remotely and send the packet data back to Wireshark on the client.

To do this, the client needs to be able to log into the remote system
and gain sufficient privileges to run tcpdump without password prompts.
There are a few different ways to do this. The simplest hack is to
allow root to log in (with keys) and put the client's public key in
/root/.ssh/authorized_keys so that the client can SSH directly to root
and run tcpdump. A better solution would be to log in as a normal user
and use something like sudo (without password prompt).

N.B. I use a local SSH agent to use an encrypted SSH key to both
authenticate to the remote system and to sudo on the remote system.

client% ssh -T ${REMOTE} "/usr/bin/sudo /usr/sbin/tcpdump -U -s0 -w -
not port ${SSH}" | wireshark -k -i -

Episode 2 of a series! You can see episode 1 (from May 8) in our archive at

# https://www.sluug.org/ and look under Presentation Archives. for... SLUUG BASIC" Network Sniffing for Beginners" for Slides Complete recording: Video, Sound, Captions, Chat. )

ONLINE MEETINGS ONLY until further notice.

• ONLINE sessions will use a remote video meeting service.
• HOW TO CONNECT instructions will be on the [https://www.sluug.org/](https://www.google.com/url?q=https://www.sluug.org/&sa=D&source=calendar&usd=2&usg=AOvVaw30xd8Gqu0jxQlAsm68bqFG) web page (The URL link to instructions at the above home page, are posted the day prior to this remote ZOOM meeting. The link is called "linked here".) and on our mailing lists. Note that your browser cache may need to be refreshed each time you check the web page for the instructions.
• We will open the remote session at about 6:00 PM, so that you can join early to test sharing your mic, screen & video camera.

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# Meetings are every 2nd Wednesday of the month from 6:30 PM to 9:00 PM.

The Saint Louis Unix Users Group (SLUUG) is dedicated to education and communication among computer users. SLUUG members include interested in Unix, Unix-like Operating Systems, Linux, BSD and other Free Open Source Software (FOSS), OPEN standards,...
Details will be published on https://www.sluug.org/ when available.