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L2TP Implementation without LCP Re-negotiation KDDI Proposal

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L2TP Implementation without LCP Re-negotiation KDDI Proposal. Masaru Umekawa ([email protected]) Masaaki Koga ([email protected]) Masaru Fukumitsu ([email protected]) Anete Hashimoto ([email protected]). 05/08/2002. Why L2TP ?.

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L2TP Implementation without LCP Re-negotiationKDDI Proposal

Masaru Umekawa ([email protected])

Masaaki Koga ([email protected])

Masaru Fukumitsu ([email protected])

Anete Hashimoto ([email protected])

05/08/2002

KDDI Confidential Proprietary

why l2tp
Why L2TP ?
  • To solve the conflict between the Private IP address used among the carries, L2TP tunneling has been considered and agreed within the CDG international roaming team.
  • In the last CDG meeting, SKT suggested and explained about L2TP tunneling with LCP re-negotiation
  • Issue:Can the mobile respond properly if the call setup is different in the home data network and in the serving side?

KDDI Confidential Proprietary

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L2TP Without LCP Re-negotiation

  • In this material, KDDI suggests L2TP without LCP Re-negotiation as a way to solve the above issue
  • No need to change current mobile implementation

Some clients possibly cannot renegotiate LCP re-negotiation (RFC2809, section4.2)

  • There is less air resource consumption if LCP re-negotiation is avoided

KDDI Confidential Proprietary

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Dual Authentication without LCP Re-Negotiation

Dial-up

Client

LAC

Serving Radius

LNS

Home Radius

LCP-CFG-REQ

Example of attribute for L2TP initialization

RFC2868(Section3)

- Tunnel-type

- Tunnel-Server-Endpoint

- Tunnel-Client-Endpoint

- etc

LCP-CFG-REQ

LCP-CFG-ACK

LCP-CFG-ACK

Example of AVP for LCP

Forwarding(RFC2661, Section4.4.5):

- Initial Received LCP CONFREQ

- Last Sent LCP CONFREQ

- Last Received LCP CONFREQ

- Proxy Authentication Type

- Proxy Authen Name

- Proxy Authen Challenge

- Proxy Authen ID

- Proxy Authen Response

- etc

PAP-REQ

Access-Request

Access-Accept

SCCRQ (Start-Control-Connection-Request)

SCCRP (Start-Control-Connection-Reply)

Example of AVP sent in ICRQ:

- Calling-Number

SCCCN (Start-Control-Connection-Connected)

ICRQ(In-Coming-Call-Request)

ICRP(In-Coming-Call-Reply)

ICCN(In-Coming-Call-Connected)

LCP Forwarding as per

RFC2809 (section 4.2)

SLI(Set-Link-Info)

Access-Request

L2TP Tunnel

Access-Accept

Accounting-Request(Start)

Accounting-Request(Start) [Optional]

Accounting-Response

Accounting-Response

PAP-ACK

IPCP (Configure-Request)

IPCP (Configure-Reply)

Accounting-Request(Start)

PPP Session

Accounting-Response

KDDI Confidential Proprietary

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Reference

  • RFC2661 Layer Two Tunneling Protocol “L2TP” (Standards track)
  • RFC2809 Implementation of L2TP Compulsory Tunneling via Radius (Informational)
  • RFC2868 RADIUS Attributes for Tunnel Protocol Support (Informational)

KDDI Confidential Proprietary

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