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I found the problem now I have to search for the solution:

Problem: if I observe the route on ipv6 I see, default via de80::c671... etc dev eth0 proto ra metric 1024 expires 1407 sec
The expires...

Found solution (add accept_ra 1 in interfaces file):

After some Googling and finding an old Ubuntu bug, the puzzle got more clearer: The DHCP client in Debian 7 declines router advertisements by...