[FS#1501] DS-Lite is broken on snapshot with some models

[LEDE Bugs]

The following task has a new comment added:

FS#1501 - DS-Lite is broken on snapshot with some models
User who did this - Tim Biermann (TimB87)

----------
Sure, this is again with the most current snapshot, WAN unmanaged and dslite configured.
On one my clients I ran ping on 8.8.8.8.

root at OpenWrt:~# ifconfig ds-wan6_4
ds-wan6_4 Link encap:UNSPEC  HWaddr 2A-02-09-08-13-00-00-0C-00-00-00-00-00-00-00-00
          inet addr:192.0.0.2  P-t-P:192.0.0.1  Mask:255.255.255.255
          inet6 addr: fe80::943a:ecff:fe51:15b2/64 Scope:Link
          UP POINTOPOINT RUNNING NOARP  MTU:1280  Metric:1
          RX packets:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:183 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:200 (200.0 B)  TX bytes:10912 (10.6 KiB)
root at OpenWrt:~# tcpdump -i eth1.2 -vvv -w ping-t8.8.8.8.output
tcpdump: listening on eth1.2, link-type EN10MB (Ethernet), capture size 262144 bytes
^C1393 packets captured
1470 packets received by filter
0 packets dropped by kernel
root at OpenWrt:~# 

Please see the attached capture. Thanks :)
----------

One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1501#comment4734