urtwn on VAX not working properly

[John Klos <john%ziaspace.com@localhost>]

Hi,

I have a VAXstation 4000/90 which is running NetBSD 8 from 15-August-2017. 
It has a TURBOchannel adapter and a TC-USB card from Felix Deichmann 
(thanks, Felix!), and USB works well.
At first I used a Ralink run* USB wireless device and had no problems 
other than the fact that it stuck out very far and made me worry something 
might get knocked and damaged.
I switched that for a Realtek urtwn* USB wireless which barely sticks out 
of the USB port. It came up, wpa_supplicant negotiated to get on the 
network, then dhcpcd was able to get an address. I could ping on the 
network.
Any sort of transfer of data larger than a certain size, though, fails. I 
could see the packets leave the VAX (well, at least the VAX thought the 
data was going out), but nothing appeared at the other end.
dmesg:
https://sage.klos.com/~john/vax_urtwn/dmesg_urtwn
VAX end:
https://sage.klos.com/~john/vax_urtwn/vax0.pcap.gz
Laptop end:
https://sage.klos.com/~john/vax_urtwn/vax1.pcap.gz
ssh log:
https://sage.klos.com/~john/vax_urtwn/ssh_output

Thoughts?

John