Re: Transport level multihoming

[Thomas Narten <narten@raleigh.ibm.com>]

Daniel Senie <dts@senie.com> writes:

> OK. So today end users can multi-home using certain NAT boxes, having
> zero cost to upgrade to IPv6 a fixed cost to get multihoming, and no
> recurring costs.

Can you please clarify what you mean here? My understanding is that
traditional NATs allow a site to avoid needing to renumber, but don't
help with multihoming.

Or are you referring to a specific NAT implementation that allows
sharing of state across boxes, and if so, do the NAT boxes use
different external IP addresses (i.e., to different providers), and
does (say) a TCP connection that somehow migrates from one box to
another continue to work transparently?

That is, what are the details on how this works?

Thomas