rfc2408.txt:Douglas Maughan:nsa:usa:82:nov:1998:UNKNOWN:format,figure,kwd:draft-ietf-ipsec-isakmp:2009-07-27:2009-03-26:10:0:98:13:121:1:2008-10-08:0::2008-10-08:173:2010-01-25:183