[FS#1361] Unable to configure multiple IPv6 prefixes in luci

[LEDE Bugs]

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

User who did this - Diego Rodriguez (diego) 

Attached to Project - OpenWrt/LEDE Project
Summary - Unable to configure multiple IPv6 prefixes in luci
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - I'm running OpenWrt SNAPSHOT r6074-267873a / LuCI Master (git-18.039.58622-76f9f5e) on Alpha ASL26555 (16M). Tried also in 15.05.1, same behavior.

I'm running a 6in4 tunnel for IPv6 connectivity, provided by Hurricane Electric.

HE delegates to me two IPv6 prefixes, a /64 and a /48.
I've set up the tunnel in lucy effortlessly, but just the /48 was working.

After pulling my hair for a long time, I figured out to add by hand another ip6prefix line to my tunnel interface in /etc/config/network

In lucy, There's a field named 'IPv6 routed prefix' that only allows exactly one prefix (and is the last one listed in /etc/config/network interface declaration). The field should be 'extensible', so multiple prefixes could be added, much like 'forwarding DNS' settings in Network/DHCP and DNS settings in lucy.
 

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1361