This testvar must be explicitly defined in the configuration file
This parameter specifies the 64-bit ULA Prefix that should be announced by the CPE. If specified, CDRouter will verify that the advertised ULA matches this prefix. The ULA test module will still run without specifying the ULA prefix but the prefix verification will be skipped.
Unique-local IPv6 unicast addresses are defined in RFC 4193, and are restricted to the fc00::/7 address block.