Comment # 6 on bug 911072 from Per Jessen

(In reply to Volker Kuhlmann from comment #3)
> Additional info point from me: My Linux systems use the default IPv6
> configuration, my firewall (and therefore gateway) is IPv6 capable, however
> my ISP is not IPv6 capable so all IPv6 connections will fail.

Unless you've got something on your system handing out a real router
prefix/address, that should not be an issue.  Having only link-local addresses
will never cause a system to attempt to use IPv6 externally.