[Bug 280390] NPTv6 not working

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280390

--- Comment #29 from [email protected] ---
Found a new side effect with ipfw nptv6. Tested and confirmed on both FreeBSD
15.0-RELEASE and 15.1-STABLE.

When the following rule is present:
$cmd nptv6 NPT ip6 from any to any via vtnet0
(or `$cmd nptv6 NPT ip6 from any to any` without `via vtnet0`)

With the rule: VPN clients can access the IPv6 internet via the server, but the
server itself loses all inbound and outbound IPv6 connectivity (cannot ping
external hosts, and external hosts cannot ping the server).

Without the rule: The server's IPv6 connectivity works perfectly fine, but VPN
client lose IPv6 internet access.

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