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Thanks Henning!
The IPV6_PMTUDISC_DO documentation says that it sets the Don't Fragment flag, which is absent in IPv6 because it always behaves that way. The kernel will then refuse larger-MTU frames with EMSGSIZE; using IPV6_PMTUDISC_WANT instead will fragment the frame at Path MTU boundaries. It is doubtful if the _DO setting works for IPv4, but it is not the intention of my PR to question code that has been around for very long.
See ip(7) which is referenced from ipv6(7).
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