Re: IPv6-PMP?

[james woodyatt <jhw@apple.com>]

On Apr 14, 2007, at 17:29, Mark Smith wrote:
> Are you able to clarify the above a bit further? Are you saying  
> that you're planning on implementing NAT for IPv6, so that you can  
> "transparently" intercept connections/flows and have them processed  
> by middleboxes in the network?
Yes.  I have to do this to make application layer gateways (ALG) for  
IPv6 to be fully transparent.  There are a lot of well-known problems  
with trying to make ALG's operate on a packet-by-packet basis in the  
IP filter before the TCP stack can reassemble the octet-stream.  It's  
not too bad for FTP, but it's really perilous when you're trying to  
handle RTSP and other applications that have complicated interactions  
between application layers and the network layer.
I figure while I'm doing that, I might as well write a general  
purpose IPv6 NAT.  I wish I didn't have to do this, but the security  
considerations are pushing me into it.

--
j h woodyatt <jhw@apple.com>