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#eurobsdcon

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xinqu

Don't be a fool (like I was) when it comes to #jails on #FreeBSD. I ignored them despite using FreeBSD for decades, because I had no problem that could not be solved w/o them and thought "why learn yet another technology I barely need".

But it's not only about solving problems. It gives you a super lightweight and fast tool to test things (and trashing 🗑️ them with zfs destroy) without cluttering your configs or interfering with production services.

E.g. I hesitated to run a webserver for publishing content because I didn't want a publicly accessible Apache on my mail relays, nor on my Nextcloud instance at home.

With jails, the MX is left unmodified. If I feel like it I could move it to a different system just using tar or cpio or zfs send.

All I needed to accomplish that was a few shell scripts to initially generate a jail template and, of course, the invaluable book "FreeBSD Mastery: Jails" of @mwl .

What motivated me to get started? All the
speakers at #EuroBSDCon showing what incredible things they do with Jails. Especially >>IMUNES: A Network Emulation and Simulation Tool Built on FreeBSD<<.

If you want to watch the IMUNES talk you can find the link on my jailed webserver 😉 here pub.v32bis.cc/eurobsdcon.html

pub.v32bis.ccEuroBSDCon Video Index
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EuroBSDCon

Recovering and reminiscing on an incredible #EuroBSDCon 2025 in Zagreb, Croatia! 🇭🇷 :flan_sad:​

What a week! Over 220 attendees, 48 brilliant speakers, and 16 amazing sponsors came together to celebrate all things #BSD. The energy was #BSD, deep dives into tech, inspiring talks, and those hallway conversations that spark new ideas and collaborations.

Huge shoutout to the video crew who made sure every moment was captured, and to everyone who traveled near and far to be part of this vibrant community. Whether it was hacking, learning, or just geeking out over #BSD, the connections made here are what make this event so special.

Zagreb, and the incredible Organizing Committee, you were the perfect host! Already counting down to the next one in Brussels! 🇧🇪

Did you attend? What was your highlight? 👇

We are collecting as much as possible on: 2025.eurobsdcon.org/wrapup.htm

Like and subscribe! :flan_XD:​

Image of a Panda resting it's head on a log of wood. it's has the text: Miss you already <3
#EuroBSDCon2026#EuroBSDCon2025#RUNBSD
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Peter N. M. Hansteen

On Thursday, September 25, 2025, Tom Smyth and I will be giving a "Network Management with the OpenBSD Packet Filter Toolset" tutorial events.eurobsdcon.org/2025/tal at #eurobsdcon in #zagreb. Register: 2025.eurobsdcon.org/registrati #openbsd #freebsd #networking #pf #packetfilter #security #trickery

events.eurobsdcon.orgNetwork Management with the OpenBSD Packet Filter Toolset (T5) EuroBSDCon 2025The OpenBSD Packet Filter (PF) is at the core of the network management toolset available to professionals working with the OpenBSD and FreeBSD operating systems. Understanding the PF subsystem and the set of networking tools that interact with it is essential to building and maintaining a functional environment. The present session will both teach networking and security principles and provide opportunity for hands-on operation of the extensive network tools available on OpenBSD and FreeBSD in a lab environment. Basic to intermediate understanding of TCP/IP networking is expected and required for this session. Topics covered include The basics of and network design and taking it a bit further Building rulesets Keeping your configurations readable and maintainable Seeing what your traffic is really about with your friend tcpdump(8) Filtering, diversion, redirection, Network Address Translation Handling services that require proxying (ftp-proxy and others) Address tables and daemons that interact with your setup through them The whys and hows of network segmentation, DMZs and other separation techniques Tackling noisy attacks and other pattern recognition and learning tricks Annoying spammers with spamd Basics of and not-so basic traffic shaping Monitoring your traffic Resilience, High Availability with CARP and pfsync Troubleshooting: Discovering and correcting errors and faults (tcpdump is your friend) Your network and its interactions with the Internet at large Common mistakes in internetworking and peering Keeping the old IPv4 world in touch with the new of IPv6 The tutorial is lab centered and fast paced. Time allowing and to the extent necessary, we will cover recent developments in the networking tools and variations between the implementations in the OpenBSD and FreeBSD operating systems. Participants should bring a laptop for the hands on labs part and for note taking. The format of the session will be compact lectures interspersed with hands-on lab excercises based directly on the theory covered in the lecture parts. This session is an evolutionary successor to previous sessions. Slides for the most recent version of the PF tutorial session are up at https://nxdomain.no/~peter/pf_fullday.pdf, to be updated with the present version when the session opens.
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