[Jool-list] not NAT64ing packets

[Brian J. Murrell]

I'm using 3.5.6.0 on OpenWrt 18.06.4.  Yes, I know it's old and
stricken but it was working for me for a while and 19.07.x is right
around the corner.  Hopefully.  :-)  The router has since rebooted and
the module didn't get automatically reloaded, so I will have to
investigate why/how to do that, but that's not relevant here.

In any case after the reboot I inserted the module manually:

# modprobe jool pool6=64:ff9b::/96
# lsmod | grep jool
crypto_hash             8288  2 jool,md5
jool                  101424  0 
nf_defrag_ipv4           800  4 jool,xt_socket,xt_TPROXY,nf_conntrack_ipv4
nf_defrag_ipv6          4304  4 jool,xt_socket,xt_TPROXY,nf_conntrack_ipv6

So it seems to be loaded OK.  It just doesn't seem to be NAT64ing
packets:

# ping 64:ff9b::1.1.1.1
PING 64:ff9b::1.1.1.1(64:ff9b::101:101) 56 data bytes
[nothing]

Those packets are making it to the router:

# tcpdump -i br-lan -s 0 -n net 64:ff9b::/96
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on br-lan, link-type EN10MB (Ethernet), capture size 262144 bytes
11:18:40.500058 IP6 2001:123:ab:123:16da:e9ff:fe48:f99e > 64:ff9b::101:101: ICMP6, echo request, seq 53, length 64
11:18:41.524101 IP6 2001:123:ab:123:16da:e9ff:fe48:f99e > 64:ff9b::101:101: ICMP6, echo request, seq 54, length 64
11:18:42.548170 IP6 2001:123:ab:123:16da:e9ff:fe48:f99e > 64:ff9b::101:101: ICMP6, echo request, seq 55, length 64
11:18:43.572236 IP6 2001:123:ab:123:16da:e9ff:fe48:f99e > 64:ff9b::101:101: ICMP6, echo request, seq 56, length 64

but the corresponding ipv4 packets are not being sent on the WAN
interface:

# tcpdump -i eth0.2 -n -s 0 host 1.1.1.1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0.2, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
9 packets received by filter
0 packets dropped by kernel

Is there something I am missing/forgetting other than to just "modprobe
jool pool6=64:ff9b::/96"?

Cheers,
b.

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