Hi: We just got that patent issued about one of the possible mechanisms to implement a carrier grade NAT.
Our patent is pretty much equivalent to tunneling to the carrier NAT over IPv6 though it does/undoes NAT-PT instead of tunneling so we do not have to define tunnels in the first place. In our patent, the home gateway has a proverbial /96 prefix that it prepends to the IPv4 private address to form the IPv6 address of the node. This is an automatic (stateless) operation that we (used to?) support in IOS and the transport/payload is not modified. The Carrier grade NAT undoes the NATPT, extracts that IPv4 private address and then acts as a standard IPv4 NAT, though it saves the /96 prefix in the NAT states to reconstruct the IPv6 address on the way back. You moght see that as a NAT_PT +NAT operation back to back. Benefits for cisco are: - Easier of implementation on the gw (no tunnel, stateless operation) - Easier of implementation on the Carrier NAT (no tunnel, mostly NAT+NAT_PT back to back) Since carrier class NATs seem pretty hot at the moment, the advice I'm seeking is: - should we draft that to the IETF? - if not should we mention our IPR against an existing draft? Thanks, Pascal >-----Original Message----- >From: patent-administrators(mailer list) >Sent: mardi 4 novembre 2008 14:14 >To: Patrick Wetterwald (pwetterw); Pascal Thubert (pthubert) >Cc: Laurie Mintz (lamintz) >Subject: [CPOL 443213] "Arrangement for reaching IPv4 public network nodes by a node in a IPv4 >private network via an IPv6 access network": has issued as US Patent No. 7,443,880 > >Congratulations! > >US Patent # 7,443,880 entitled 'Arrangement for reaching IPv4 public network >nodes by a node in a IPv4 private network via an IPv6 access network' was >issued on 28-Oct-2008. Thank you for your support of Cisco's patent program. > >As part of Cisco's patent award program, active/regular employees are >entitled to receive a monetary award and a patent plaque. Please check CPOL >to view the status of your award. Details regarding the patent award policy >are at http://wwwin-eng.cisco.com/pcb/cpol/patent.cgi?task=Help&hsecn=Awards > >As part of our ongoing effort to improve the quality of our patent portfolio, >Cisco periodically requires that you provide us with feedback regarding the >status of your inventions and any products that might incorporate them. If >you have not already done so, please visit the URL below and complete the >short questionnaire regarding this CPOL record. NOTE THAT THE ISSUANCE AWARD >PAYMENT IS CONTINGENT UPON YOUR COMPLETION OF THIS QUESTIONNAIRE: > >http://wwwin-eng.cisco.com/pcb/cpol/patent.cgi?task=StatusUpdate&patent _p=443213 > >If this patent is necessary to implement a current or proposed standard, >please visit the Cisco Standards Registration Tool, >http://wwwin-eng.cisco.com/pcb/standards/csrt.cgi, to ensure that the related >contribution is registered and associated with this patent. Failure to >disclose standards activity related to a patent in a timely fashion may >result in forfeiture of award. > >Thank you for your assistance. > >Cisco Patent Team > > > >----------------------------------------------------------------------- ------ >This e-mail was generated by CPOL v2.7.54. To reach CPOL administrators >please use the Contact form. > >For patent idea details: >http://wwwin-eng.cisco.com/pcb/cpol/patent.cgi?task=PatDetails&patent_p =443213 > >Contact URL: >http://wwwin-eng.cisco.com/pcb/cpol/patent.cgi?task=Feedback > >Committee: CMSG >PortMgr: lamintz > >All notes, comments and other information herein constitute Cisco >confidential information and may be privileged communications to or from one >or more attorneys and/or supporting personnel for purposes of obtaining or >facilitating legal advice and/or legal services. > *** CISCO CONFIDENTIAL *** -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
