Softwires Network Address Translation (SNAT)

Document Type Replaced Internet-Draft (individual)
Authors Ralph Droms  , Brian Haberman 
Last updated 2008-10-22 (latest revision 2008-07-14)
Replaced by draft-durand-softwire-dual-stack-lite
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-durand-softwire-dual-stack-lite
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Service providers (ISPs) are interested in reducing the use of IPv4 in their internal networks because of the anticipated exhaustion of the IPv4 address space. Softwires Network Address Translation (SNAT) combines IPv4 NAT and IPv4-in-IPv6 softwires to carry IPv4 traffic through the ISP network that uses only IPv6 service. Multiple subscribers are multiplexed through a single external global IPv4 address, reducing the total number of IPv4 addresses in use by the ISP to support Internet traffic to those subscribers.


Ralph Droms (
Brian Haberman (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)