[Jool-list] not NAT64ing packets

[Alberto Leiva]

Works for me. Though admittedly I'm testing 3.5.6 on Ubuntu since my
OpenWRT VM died some time ago.

Will try to create a new OpenWRT VM. In the meantime, a couple of
typical troubleshooting questions off the top of my head:

- Does your translator have a route towards 1.1.1.1? (Can you ping
both 2001:123:ab:123:16da:e9ff:fe48:f99e and 1.1.1.1 from the
translator when Jool isn't modprobed?)
- Is Jool printing something in dmesg?

On Tue, Jan 7, 2020 at 10:23 AM Brian J. Murrell <brian at interlinx.bc.ca> wrote:
>
> 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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