I have an interesting uplink that drops packets of size about 1430-1470, but has no issue with smaller or bigger packets, even 1500. ICMP is rate-limited, and

I have an interesting uplink that drops packets of size about 1430-1470, but has no issue with smaller or bigger packets, even 1500. ICMP is rate-limited, and 1500 byte packets work, so PMTUD doesn't kick. Hence, the connections hang if you hit the magic size. Had to decrease MTU. Unfortunately, that doesn't solve remote-side UDP.