Hello Pekka, ----- Original Message ----- From: "Pekka Savola" <[EMAIL PROTECTED]> To: "???" <[EMAIL PROTECTED]> Cc: "Bob Hinden & Margaret Wasserman" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Saturday, July 05, 2003 4:25 PM Subject: Re: Re: [I-D] IPv6 DAD Consideration for 802.11 Environment
> On Sat, 5 Jul 2003, [EUC-KR] �ڼ�ȫ wrote: > > >The purpose of DAD is not to detect MAC address duplication, but IP > > >address duplication. > > > > Generally, MAC (IEEE 802 48bit) duplication occurs IP address duplication > > with same Interface ID. > > Also I didn't mention that the purpose of DAD was to detect MAC duplication in this draft. > > The intent of this approach is that we can not detect the same MAC and IP address in 802.11 environment > > with existing DAD procedure. > > DAD does not detect (or rather, is not meant to detect) MAC duplication in > regular wired Ethernet. When MAC is duplicated and the node filters the frames based on Source MAC, DAD is no good. This is true even if the IPv6 address is being constructed using random interface identifier. And if MAC is unique and IID is being derived from MAC address, then also DAD is no good. In this case, DAD is useful, if IID is a random identifier. > > Then why not being able to detect it in 802.11 is a problem? If the wired ethernet also does the source filtering based on MAC address, then it is a problem with both of them (Wired and Wirelss). > > Note that DAD as specified still works in 802.11 perfectly, AFAICS. > > > >Perhaps this would speak for some form of applicability statement for DAD, > > >to be clear what it is meant to solve and what it isn't. > > > > So far there is not any applicability statement for DAD without > > 802.11 environment. > > Which was my point: one should be created :-) > > -- > Pekka Savola "You each name yourselves king, yet the > Netcore Oy kingdom bleeds." > Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings > > -------------------------------------------------------------------- > IETF IPng Working Group Mailing List > IPng Home Page: http://playground.sun.com/ipng > FTP archive: ftp://playground.sun.com/pub/ipng > Direct all administrative requests to [EMAIL PROTECTED] > -------------------------------------------------------------------- > > -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
