[FS#1002] Dns ipv6 problem when interface restart

[LEDE Bugs]

The following task has a new comment added:

FS#1002 - Dns ipv6 problem when interface restart
User who did this - Hans Dedecker (dedeckeh)

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The last pcap shows solicits sent by the DHCPV6 client but no answer by the Tim DHCPv6 server ...
This is different with the first pcap which showed solicit messages sent by the DHCPv6 client answered by advertise messages by the Tim DHCPv6 server.
This is getting very confusing to pinpoint the root cause of the issue as now it seems to indicate an issue in the Tim network.
I would like to have odhcp6c traces both in the working and non working cases; therefore change the following line in the /lib/netifd/dhcpv6.sh script 

proto_run_command "$config" odhcp6c \
		-s /lib/netifd/dhcpv6.script \
		-v $opts $iface

Via logread you will be able to read the odhcp6c traces; as said I would like to see the odhcp6c traces both in the working and non working case

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1002#comment3454