On Feb 21, 2009, Scott Brim wrote:
3.1.2. Translation
Translation solutions are characterized by a translation
operation between an identifier to a locator and back to an
identifier as the packet traverses the network.
Now that I've pondered this a little, I can't think of any approach
that does that (translate from identifier to locator and back again).
Scott -
All address indirection solutions that are application-transparent do
map both source and destination addresses at both ends. I.e., you have
four mappings per packets: The respective local addresses (source
address at the sending side; destination address at the destination
side) are mapped to achieve provider independence. The respective
remote addresses are mapped to achieve application transparency.
NAT-based approaches and Six/One Router are also one-way: the local
source address is translated to an RLOC when outgoing, and the
destination address is translated to a local address when incoming.
As you mention Six/One Router -- this solution proposal actually has two
modes: One mode is NOT application-transparent; this, as you say, maps
only the respective local addresses (two mappings per packet). But
Six/One Router also has an application-transparent mode, which performs
all four mappings per packet. The two modes are called Unilateral mode
and Bilateral mode, respectively.
And FWIW: Six/One Router, Unilateral mode == NAT66.
- Christian
_______________________________________________
rrg mailing list
[email protected]
http://www.irtf.org/mailman/listinfo/rrg
