[FS#650] 6in4 addresses are not advertised via DHCP.

[LEDE Bugs]

The following task has a new comment added:

FS#650 - 6in4 addresses are not advertised via DHCP.
User who did this - neheb (neheb)

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Aaand that was the issue. I think I did this out of habit from my tomato days where you stripped the 64 from the prefix.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=650#comment2219