Tux Machines

today's howtos

Posted by Roy Schestowitz on Jul 07, 2023

Free Software Leftovers

Implementing a system call for OpenBSD and Major pfsync(4) Rewrite Has Been Committed

URL explained - The Fundamentals

↺ URL explained - The Fundamentals

> In this post, I'll try to explain the syntax and use of an URL and the difference between URI, URL, URN, and URC.

Extending the Reach of Data Logging

↺ Extending the Reach of Data Logging

> SparkFun has long offered embedded products that focus on logging information from a connected system or sensor. These ready-to-use products enabled rapid data logging of a connected device to a local storage (SD card) or to an attached serial device, while delivering a low-power, flexible data logging solution that required minimal configuration and no firmware development effort. Later versions also added the capability for automatic device recognition, delivering a true, plug-and-play data logging solution.

Basic NFS v4 seems to just work (so far) on Ubuntu 22.04

↺ Basic NFS v4 seems to just work (so far) on Ubuntu 22.04

> Part of the reason it worked this transparently is that the client and the server both had our standard /etc/resolv.conf and had their hostnames in a standard format (and have fully qualified domain names in the same subdomain). My understanding is that this matters because for 'sec=sys', NFS v4 clients and servers need to agree on a NFS v4 domain name to insure that login 'fred' on the client is the same as login 'fred' on the server. This 'domain name' can be set explicitly in idmapd.conf(5), but if you don't do this it's derived from the DNS domain names of the hosts involved. In a production deployment, we'd probably want to set this specifically in idmapd.conf just to avoid problems.

Still NAT’ing with IPv6

↺ Still NAT’ing with IPv6

> Things are different with IPv6. I learned that ISPs typically delegate you an entire /48 range of addresses, from which your router DHCP’s to your local machines. This negates the need for NAT and port forwarding, because every end point is globally routable.

I want XAES-256-GCM/11

↺ I want XAES-256-GCM/11

> In 2023, the way to use AES is AES-GCM. Anything else is very unlikely to make sense. We might not like that, we might wish OCB hadn’t been patented, but with hardware support in most processors these days GCM is both faster than the alternatives, ubiquitous, and just tolerable to implement.

gemini.tuxmachines.org