netInstall on CRS125 failure

I’ve been consistently unable to netinstall a CRS125 with 6.35.4 or 6.36rc28.

I see the DHCP packets from the CRS arrive on the only network interface, but even after all the usual tricks (disable firewall, IP address assignment etc), netinstall doesn’t reply. I have tried on two Windows 10 systems, and under wine on Ubuntu 16.04, but not cigar. I had netinstall on windows 10 working against a RB2011 6 months back.

Has anyone else found this?

I get this output from netinstall:

recv bytes: 300
opcode: 1
htype: 1
hlen: 6
hops: 0
xid: 6b6e15f0
secs: 40
unused: 0
ciaddr: 0.0.0.0
yiaddr: 0.0.0.0
siaddr: 0.0.0.0
giaddr: 0.0.0.0
chaddr: 4c:5e:c:96:23:c6:
sname:  (64)
file:  (128)
cookie: 63538263
35  01  03  3d  07  01  4c  5e  0c  96  23  c6  3c  09  4d  69  70  73  5f  62  6f  6f  74  37  02  01  03  ff  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  00  02  00  00  00  00  00  22  00  68  2f  0b  00  00  e0  cb  7b  vend: 

REQ RECEIVED:
FAILED TO REPLY