IETF Last Call Review of draft-ietf-v6ops-rfc6146-bis-07
review-ietf-v6ops-rfc6146-bis-07-artart-lc-levine-2026-06-28-00

ARTART last call review of draft-ietf-v6ops-rfc6146-bis

Reviewer: John Levine

Overall: Ready with Issues

Figure 1 is scrambled. It looks like it was intended to be two large
boxes representing IPv6 and IPv4 networks connected by smaller boxes
for DNS64 and NAT64. But the right edge of the IPv6 box runs through
the middle of the small boxes. There is a vertical line under the k in
"IPv6 network" that might have been intended to be the right edge of
the IPv6 box but isn't. This figure is unchanged from RFC 6146 where
it was equally scrambled, which makes me wonder when was the last time
somone really looked at it.

Both this figure and Figure 2, which appears correct but is complex
and confusing, could benefit from being redrawn as real figures using
SVG tools.

The security considerations should say something about DNS64 and
DNSSEC, since the synthesized AAAA records are not and cannot be
signed. There are workarounds but none of them are great. RFC 6147
Section 3 discusses this issue so it could refer there.

I have looked at Tony Li's review and while I am not as sceptical of
IPv6 as he is, I generally agree with the changes he proposed.