[AusNOG] IPv6

[Mark ZZZ Smith]

So according to Christian Huitema in "IPv6: The New Internet Protocol", 2nd edition, they did consider swapping the source and destination fields around in around 1996, after the IPv6 specs were pretty much finalised, yet doing something as significant as that was still achievable because there weren't any implementations around.
However, they thought that for the cases where swapping them around would make a performance difference (i.e., where the header portions containing the src & dst addr were read in multiple parts) it was likely that the source address would also be a possible input into forwarding, so leaving the order as it is was best.
Regards,Mark.
      From: David Beveridge <dave at bevhost.com>
 To: Chris Hurley <chris at minopher.net.au> 
Cc: "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net> 
 Sent: Wednesday, 1 April 2015, 7:30
 Subject: Re: [AusNOG] IPv6
   


On Tue, Mar 31, 2015 at 11:49 PM, Chris Hurley <chris at minopher.net.au> wrote:

While I appreciate the horse has well and truly bolted the BIGGEST mistake
in IPv6 was not making it backwardly compatible with IPv4.

IPv6 is not incompatible with IPv4, both can be run together on the same machine.For what it's worth, I think the biggest mistake with IPv6 was putting the destinationaddress an the end of the header instead of the start.  A router must wait for the entire header to be received before it can start switching the packet. 
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