[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)

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Hey Hans,

many thanks for looking into it!

I did a fresh flash of the newest snapshot, installed dslite and luci and then rebooted, same behavior - then replaced the script with yours - again the same behavior.

I installed tmux to follow the logread when doing a network restart. I don't see much, but:

Wed Apr 25 03:03:19 2018 daemon.err odhcp6c[1944]: Failed to send RS (Address not available)
..
Wed Apr 25 03:03:19 2018 daemon.err odhcp6c[1944]: Failed to send DHCPV6 message to ff02::1:2 (Address not available)
..
Wed Apr 25 03:03:21 2018 daemon.notice netifd: Interface 'wan6_4' is now up
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Wed Apr 25 03:03:22 2018 daemon.warn odhcpd[1813]: A default route is present but there is no public prefix on br-lan thus we don't announce a default route!

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1501#comment4656