Why is my domain controller causing my router to send advertisements for Unique Local Addresses?

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http://serverfault.com – I'm currently evaluating Server 2012 to serve as a domain controller in a small heterogeneous network of Linux and Windows workstations and servers, all of which would eventually be joined to the domain. This is a 100% dual stack network; every device has IPv4 and IPv6 connectivity. The router is a Linux server running radvd 1.9.1 and various other necessities. I have just installed the first domain controller; its domain name is ad.businessname.com (where businessname.com is handled by external DNS servers; the domain also has the public website, email etc. and these won't be joined to the d (HowTos)