[pcp] #71 (dslite): Handling change of B4's IPv6 address
"pcp issue tracker" <trac@tools.ietf.org> Thu, 27 February 2014 22:46 UTC
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Subject: [pcp] #71 (dslite): Handling change of B4's IPv6 address
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#71: Handling change of B4's IPv6 address [DSlite portion of ticket #34 moved to this ticket] ====== 2.5. Change of the CPE WAN IP Address The change of the IP address of the WAN interface of the CPE would have an impact on the accuracy of the mappings instantiated in the PCP Server: o For the DS-Lite case [I-D.ietf-softwire-dual-stack-lite]: if a new IPv6 address is used by the B4 element when encapsulating IPv4 packets in IPv6 ones, the mappings SHOULD be refreshed: If the PCP Client is embedded in the B4, the refresh operation is triggered by the change of the B4 IPv6 address. This would be more complicated when the PCP Client is located in a device behind the B4. [Ed. Note: how an IPv4 host behind a DS-Lite CPE is aware that a new IPv6 address is used by the B4?] o For the NAT64 case [I-D.ietf-behave-v6v4-xlate-stateful], any change of the assigned IPv6 prefix delegated to the CPE will be detected by the PCP Client (because this leads to the allocation of a new IPv6 address). The PCP Client has to undertake the operation described in Section 2.4. ======== An issue is still unsolved in the DS-Lite case where the PCP client is not co-located with B4. This issue is not solved in the base PCP spec, but is addressed in this individual draft: http://tools.ietf.org/search/draft- vinapamula-softwire-dslite-prefix-binding-01 The recommendation in http://tools.ietf.org/search/draft-vinapamula- softwire-dslite-prefix-binding-01 covers the PCP case, in particular these two recommendations: 3. In the event a new IPv6 address is assigned to B4, the AFTR SHOULD migrate existing state to be bound to the new B4's IP address. This ensures the traffic destined to the previous IPv6 address will redirected to the new IPv6 address. The destination address for tunneling return traffic SHOULD be the last seen address from the CPE. The source address of the tunnel would remain same as AFTR. 4. In the event of change of the CPE WAN IPv6 prefix, unsolicited PCP ANNOUNCE messages SHOULD be sent by the B4 element to internal hosts to update their mappings. -- -------------------------------------+------------------------------------- Reporter: | Owner: draft-ietf-pcp- mohamed.boucadair@orange.com | dslite@tools.ietf.org Type: defect | Status: new Priority: major | Milestone: milestone1 Component: dslite | Version: 1.0 Severity: Active WG Document | Keywords: -------------------------------------+------------------------------------- Ticket URL: <http://tools.ietf.org/wg/pcp/trac/ticket/71> pcp <http://tools.ietf.org/pcp/>
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