Just wanted to share some thoughts on #RFC9715 - an #RFC that defines standards on reducing the #DNS issue of IP fragmentation over #UDP. It's not a long read, but a good one for everyone who understands the issues of large UDP responses on the #Internet. A great leap forward to (hopefully) reduce the reflection/amplification #DDoS potential of DNS.

Just today I learned that #Google will share their public DNS resolvers to limit to ~1400 bytes (smaller adjustments expected while figuring out the sweet spot in production). From now on, DNS responses which exceed this limit will have the truncated flag set instructing the client to resolve back to #TCP.

Anstatt random Zöllen einfach mal #IPv4 abschalten, weil ist ja sowieso alles Frei.

#ipv4 is hell

So much easier to go #ipv6 only.

Hello le #fediverse ! J'envisage peut-être de passer mes instances #peertube, #friendica, #pixelfed et #mastodon vers des serveurs full #ipv6 (des tests sont en cours avec pixelfed), ce qui me permettrait d'avoir une ip publique différente par machine, ce qui n'est pas le cas avec #ipv4, tous mes services tournent sur une même machine (ça fonctionne mais ce n'est pas très safe). Êtes-vous prêts pour le 100 % #ipv6 ? Vos réponses m'aideront à prendre une décision

Проброс сайта, не имеющего глобального IP-а́дреса, из локальной сети на свой сервер в Интернете (обратный прокси) через сеть Yggdrasil
https://multed.com/2024/04/03/nginx-and-yggdrasill.html

Just had a hair-tearing situation (and I already have barely any hair left) where @letsencrypt certbot simply refused to create a key/cert pair on a @debian server.

Turned out to be a domain with a mix of IPv4 and IPv6 #DNS records. #IPv4 were changed, #IPv6 not.

https://www.claudiokuenzler.com/blog/1480/lets-encrypt-certbot-error-mixed-dns-records-ipv4-ipv6

Today, when looking into #ipv4/#ipv6 issues, I learned about #happyeyeballs (https://en.wikipedia.org/wiki/Happy_Eyeballs).

Such a pretty name for such an annoying problem.

Question to the network people out there:

Are there any ISPs that are IPv6 only (without providing a NAT/whatever)?

Background: Having an argument with a provider that hasn't published any AAAA records, and whilst I think that's poor form, I'm wondering if this would actually negatively affect any actual users in practice?

#IPv4-Adressen als Wertanlage

It would be nice if infosec and IT tools provided better IPv6 support.

Weren't we supposed to run out of IPv4 addressees 10 years ago? What happened to the IPv6 revolution?

IPv4 and IPv6 addresses

Start: 15 April 2025 3:00 pm
End: 15 April 2025 5:00 pm

15th April 2025 at 3pm UK

This month we look at IP (Internet Protocol) addresses, including both IPv4 and IPv6.  The talk includes a brief description of IPv4 addresses, problems with IPv4, IPv6 addresses and current IPv6 status.

Joining details will be emailed to subscribers nearer the time.  If you aren’t a member, it’s free to join here https://u3acommunities.org/subscribe-to-computing-forum/.

Plenty of time is reserved for discussions.

https://u3acommunities.org/event/ipv4-and-ipv6-addresses/

TIL about lsd(1)

What an awsome addition to my lolcat arsenal!

The acronym is not correctly used by me in this case, because I **know** I used LSD in the 1990's (the command in a UNIX ENV:) and LSD is just as pretty as it was psychedelic in the last century!

`man lsd `

An ls command with a lot of pretty colors and some other stuff.

@altbot

#bash #sh #zsh #ksh #csh #Networking #IPv6 #IPv4 #ProxMox #freeBSD #Linux #POSIX #Programming

IPv4 Addresses & Subnetting: Your Ultimate Guide

Join CISSP training - https://infosectrain.com/courses/cissp-certification-training/

So today, I changed some parts of my network equipment: router and access points.

Everything went relatively smoothly.
Some observations:
* #IPv4 and #IPv6 internet connectivites are ok
* I can use more of my ISP subscribed bandwidth (up to 2.5Gbps down and 800Mbps up).
* DHCP reservations have been recreated
* Wifi is now in part #WiFi7 enabled.

So I’m basically back to the previous state. And will have to take advantage of the new possibilities as I familiarize myself with this new system.

Tomorrow will be the first real test though

Is there a standardised (or vaguely common) hostname akin to localhost that either a) only resolves to the IPv4 127.0.0.1, or only resolves to the IPv6 [::1]? In my experience, whether localhost resolves to an IPv4 or IPv6 address seems to be somewhat OS-dependent (or even system-dependent), I am wondering if there's a standard way to specify that I do want either the IPv4 version or the IPv6 version?

Why did this come up, you ask? I have a service on localhost that only listens on IPv4, but today localhost resolved to [::1] and it broke. Now I fixed it easily by specifying 127.0.0.1 as the server address instead of localhost in the upstream proxy, but it did make me start wondering.

Note that I've fixed my issue. I'm purely curious about standard/common hostnames for IPv4-only localhost or IPv6-only localhost. If you give me advice on fixing the problem, I'll just ignore it.

IPV4, IPV6… Hey! What Happened to IPV5? - If you’ve ever been configuring a router or other network device and noticed that ... - https://hackaday.com/2025/03/09/ipv4-ipv6-hey-what-happened-to-ipv5/ #retrocomputing #networking #ipv4 #ipv6