On Sat, 10 Aug 2002, Margaret Wasserman wrote: > There are many implementations that don't have the ability to > reassemble a 65,353 byte packet, at least not without allocating > a 64K buffer for this purpose. So, this seems to be a harsh > restriction to place on RFC 2893 implementations. > > If we need to choose one or the other, I'd prefer limiting the > MTU of these tunnels to 1280.
Do such implementations which have problems with 64KB packets need to be able to use tunneling? Doesn't seem harsh to me (e.g. small devices like LCNA's should not have to do this), though we need analysis whether this is really a problem. > Margaret > > > At 08:10 AM 8/9/02 , Erik Nordmark wrote: > > > since there's no standard, some implementation can be picky and > > > assume MRU == MTU. maybe RFC2893 should talk more about MRU and MTU. > > > >How about: > > A node implementing RFC 2893 MUST be able to reassemble IPv4 packets > > of a size up to and including 65353 octets and MUST NOT place > > any limits on the size of the received encapsulated packets. > > In particular, it MUST NOT assume that the maximum size of > > received packets has anything to do with the MTU for the tunnel. > > > >Of course, it might also make sense to add some SHOULD (or MUST?) to > >section 3.2 in RFC 2893 to make IPv4 MTU discovery across the tunnel > >seem less optional than what the current text says. > > > > Erik > > > >-------------------------------------------------------------------- > >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] > -------------------------------------------------------------------- > -- Pekka Savola "Tell me of difficulties surmounted, Netcore Oy not those you stumble over and fall" Systems. Networks. Security. -- Robert Jordan: A Crown of Swords -------------------------------------------------------------------- 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] --------------------------------------------------------------------
