rfc8168.txt:Cong Liu:tsinghua:china:9:may:2017:UNKNOWN:kwd,seccons,ianacons:draft-ietf-dhc-dhcpv6-prefix-length-hint-issue:2006-02-02:2005-12-15:18:0:0:34:52:1:2004-7-1:0::2004-7-1:529:2006-06-30:148