[Jool-list] NAT64 behind NAT44?

[Maurice Walker]

Hello again,

I now installed OpenWrt + Jool on physical hardware and still see exactly the same issues. The VM's synthetic NIC doesn't seem to be the culprit here.
So back to the question if this might be related to the fact that I'm essentially trying to run "NAT644":

Router:
WAN: Dual Stack (one public IPv4 address)
LAN: 2001:db8:1:1::1/64, 192.168.1.1/24
NAT44 from LAN to WAN
default routes via WAN
route 2001:db8:1:64::/64 via 2001:db8:1:1::64

OpenWrt / Jool NAT64:
eth0: 2001:db8:1:1::64/64, 192.168.1.64/24
default gateways 2001:db8:1:1::1, 192.168.1.1
connected to LAN
pool6=2001:db8:1:64::/96
no pool4 specified

Clients:
2001:db8:1:1::x/64, default gateway 2001:db8:1:1::1, connected to LAN

MTU is 1500 on all interfaces.

On www.speedtest.net (which is IPv4-only), the download test works as expected (>150 Mbps), but the upload test fails (socket error).
This works fine when using Go6Lab's public Jool NAT64 (or native IPv4).

Maurice