Re: (ngtrans) I-D ACTION:draft-ietf-ngtrans-mech-v2-01.txt

["Fred L. Templin" <ftemplin@IPRG.nokia.com>]

Erik Nordmark wrote:

> > I liked the suggestion of 1380 bytes for the MTU when dynamic tunnel 
> > configuration
> > is not used. I believe this also requires an MRU of at least 1400 bytes 
> > in the receiver,
> > however. Does this require any sync-up with the IPv6 node requirements 
> > draft? The
> > text there says:
> >
> >  "If Path MTU Discovery is not implemented then the sending packet size is
> >    limited to 1280 octets ..."
> >    
> That is an orthogonal issue.
> An IPv6 sender that doesn't perform path MTU discovery will only send <=1280
> bytes as you point out, but the IPv4 reassembly buffer size of
> the receiver on a tunnel decapsulator is merely a function of how
> the IPv6-in-IPv4 tunneling is done.
Yes - unless a dynamic mechanism is used.

> > We would like to be able to cite [MECH](bis) out of the next version of the
> > ISATAP draft. Do you have any timeframe for making the changes?
> >    
> I'd like to get it done in a month.
This might be too late for us to get ISATAP ready for last call. We may 
decide to
continue to work the issue out of our document for now. But, I believe 
we have
sufficient flexibility around the minimum sizing to acommodate extra 
layers of
encapsulation, e.g., VPN.

Thanks,

Fred Templin
osprey67@yahoo.com