ipv6 default route from somewhere

[Dave Taht]

I have been gradually moving more tinc servers over to ipv6 addresses
on the tinc 1.1 branch.

Tinc is inserting a default route for ipv6 for some reason...

default via 2600:3c01:e030:f2::1 dev tinc6  proto static  metric 950
pref medium

In my case the default route supplied by ra is still the correct
thing, but I don't see where in the code tinc is inserting this route
from.... which, as I'm also connecting tinc over ipv6 makes things
rather circular in some instances.

Is there a way to suppress this behavior, or make it insert a source
specific route?

I'm also using source specific routing to manage the different ipv6
address spaces, which generally works well in linux 3.10.12 and later,
e.g.:

default from 2600:3c01:e030:f2::/64 via 2600:3c01:e030:f2::1 dev tinc6
 metric 1024  pref medium
default from 2601:646:4103:56c0::/60 via fe80::16cc:20ff:fee5:64c2 dev
eno1  proto babel  metric 1024  pref medium

(not my real ip addresses)