On Fri, Oct 10, 2014 at 05:52:21PM +0000, Wessels, Duane wrote: > Mohamed, > > I'd say it is valid. > > RFC 6891 says (section 6.1.2) that a client or server should simply > ignore OPTION-CODE values that it doesn't know about. The request > should be processed as though that funny option code were not even > there.
There's more to it. Mark has written it up here: http://tools.ietf.org/html/draft-andrews-edns1-01 Mukund
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