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@sergey-safarov You did not say how it "did not work as expected".
With what I've learnt, I was a bit surprised about the IPv4 original code, which says
optval= (pmtu_discovery) ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
WIth ptmu_discover != 0 this code sets the DF flag on all IPv4 traffic, and makes it behave like in IPv6 where this is implied. But I am not so sure if it picks up any ICMP messages Fragmentation needed and DF set are processed. An unconnected socket has no way of using that.
Had it been IP_PMTUDISC_WANT, like I used for IPv6, then at least any such messages would have been learnt by the OS for the route and influence the resend.
I did not want to change the existing code, but given that you do not experience a benefit, this might make sense. It is much less clear than in the case for IPv6, though, so I am uncertain.
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