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> In the future you can probably go "IPv6-mostly" with a CLAT engine

...although there still isn't any kernel support for the necessary SIIT v4<->v6 translation, so to implement CLAT you end up using unmaintained (and unmergeably bad) out-of-tree kernel modules or unmaintained (and slow) userspace daemons hanging off a tuntap interface.



pf on OpenBSD does it fine.


It does yes. I should have written 'no Linux kernel support' rather than 'no kernel support', sorry. The BSDs are better off than Linux here.




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