this post was submitted on 10 Nov 2024
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Explain Like I'm Five

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ELI5: ipv6 (feddit.org)
submitted 5 days ago by superkret@feddit.org to c/explainlikeimfive@lemmy.world
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Seriously, my knowledge ends with:

  • It offers a shitload of IP addresses
  • They look really complicated
  • Something about every device in your local network being visible from everywhere?
  • Some claim it obsoletes NAT?

I get that it's probably too complicated a subject for an ELI5, so if there are good videos or resources explaining it in less than half an hour, feel free to share.

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[–] corroded@lemmy.world 1 points 5 days ago (1 children)

Really? Just out of curiosity, what kind of connection are you on? I have two ISPs, one of which provides a single IPv4 address only, and the other provides one IPv4 and one IPv6 address.

[–] superkret@feddit.org 2 points 5 days ago (1 children)

It's a coaxial cable connection from Vodafone in Germany, using Dual Stack Lite.

It uses IPv6-only links between the provider and the customer, but does not use NAT64 translation. When a device in the customer network sends an IPv4 packet to an external destination, the IPv4 packet is encapsulated in an IPv6 packet for transport into the provider network. At the LSN, the packet is decapsulated and NAT44 is performed

[–] corroded@lemmy.world 2 points 5 days ago

Based on this reply, I get the distinct impression that you know a LOT more about networking than your original ELI5 post lets on, and almost certainly more about the subject than I. I work in tech, but not with networking specifically; most of my knowledge is from way too many years and dollars spent on homelabbing.

One of my internet connections is a DSL connection; by default, they provide a single IPv4 address. My DSL modem has an option to enable IPv6 tunneling through IPv4, but I was never able to get it to work, and customer support was completely clueless. I suspect this isn't something their network supports and they're just counting on their users not caring. My other connection is over satellite (Starlink), and as far as I am aware, they're only providing a single IPv6 connection, not a block of addresses.

To make things easy, I've just blocked IPv6 at my firewall, and I use policy-based routing on my PFsense box to send traffic to either connection depending on latency/bandwidth requirements (Streaming goes to satellite, VoIP goes to DSL, etc). I know that IPv6 has improvements beyond just "more addresses," but at this point I can't really justify enabling it on my network. It would only be used internally, and I just don't see any tangible benefit.