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Maybe we can get good IPv6 support now (lemmy.world)

submitted 5 months ago by [email protected] to c/[email protected]

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https://www.sidn.nl/en/news-and-blogs/cgnat-frustrates-all-ip-address-based-technologies

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[–] [email protected] 4 points 5 months ago (1 children)

I run both because of this; and because SLAAC enables features in Desktop OSes that offer some level of additional privacy.

For example; Windows can do "Temporary IPv6 Addressing" that it will hand out to various applications and browsers. That IPv6 address rotates on a periodic basis; once every 24 hours by default; and can be configured to behave differently depending on your needs via registry keys.

This could for example, allow you to quickly spin up a small application server for something; like a gaming session; and let you use/bind that IPv6 address for it. Once the application stops using it and the time period has elapsed; Windows drops the IP address and statelessly configures itself a new one.

[–] [email protected] 1 points 5 months ago (1 children)

I also like the privacy extensions, but how often does your prefix even change? Most places I've seen you get a /64 announced and it basically never changes -- so somewhat elementary to "break through" that regardless.

[–] [email protected] 2 points 5 months ago

I have a /48 that I can basically roll through.

A /64 is more than enough though to prevent most casual attempts at entry; and does force more work / enumeration to be done to break into a network and do damage with. I'm not saying the privacy extensions are the greatest; but they do work to slightly increase the difficulty of tracking and exploitation.

With a /48 or even a /56; I can subdivide things and hand out several /64s to each device too; which would shake up things if tracking expects a /64 explicitly.

I actually use /55s to cordon off blocks inside the /48 that aren't used too. So dialing a random prefix won't help. You'd be surprised how often I get intrusive portsweeps trying to enumerate my /64s this way...and it doesn't work because I'm not subnetting on any standard behavior.