Description of problem: That's not valid. What are you intending by such a configuration? Version-Release number of selected component (if applicable): anaconda-11.3.0.38-1
Poking at the anaconda source, I see: loader.c:648: loaderData->ipv6 = strdup("dhcp"); loader.c:1272: loaderData->ipv6 = strdup("dhcpv6"); Presumably that's the source, although one of those lines probably needs fixed.
*** Bug 328921 has been marked as a duplicate of this bug. ***
The internal Network object in anaconda does not directly map down to ifcfg-* settings. At one point it did, so I added support to write out correct IPV6 values based on what we collected from the user.