[FS#546] odhcpd gives out only one IPv6 address per DUID

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - torstefi (torstefi) 

Attached to Project - LEDE Project
Summary - odhcpd gives out only one IPv6 address per DUID
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - Earlier this evening, my router had a recent git-version of OpenWRT, where this worked correctly, i.e. all interfaces got IPv6 addresses that then got added to DNS (dnsmasq on the router). After I upgraded (sidegraded?) to LEDE 17.01, this is broken, and only the first interface is assigned an address. This exact behavior occurs with four different clients (One AMDsoc based industrial board with 2 network interfaces (Manjaro), one dual socket Intel Xeon based server with three network interfaces (Manjaro), one dual socket Intel Xeon based workstation with two network interfaces (Windows), and one Intel atom based NAS with two network interfaces (ReadyNAS OS, actually Debian 8)).

HW/SW:   
My router is a WNDR3800 with LEDE 17.01

Steps to reproduce:

Configure stateful DHCPv6. Connect host with multiple interfaces to network. Restart DHCP client to trigger assignment.

Expected result:

Addresses assigned to all interfaces.

Actual result:

Address assigned to one (1) interface.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=546