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I use NPtv6 to convert the prefix 2001:db8::/48 delegated by the ISP to my ULA addresses fc00::/48. This works as expected.

But when I ping from fc00::1 (internal) an IP address on the delegated prefix it does not work. With pfsense the same setup works but I guess the reason is the binat rules:

opnsense:

Code Select Expand

pfctl -v -s nat | grep binat
binat on external inet6 from fc00::/48 to any -> 2001:db8::/48

pfsense:

Code Select Expand

pfctl -v -s nat | grep binat
binat on em0 inet6 from fc00::/48 to any -> 2001:db8::/48
binat on em0 inet6 from any to 2001:db8::/48 -> fc00::/48    <---- missing on opnsesne

unfortunately I can't check this because I can't create a nat rule on the cli. Does anyone have any ideas on how to solve the problem?