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Labcourse “Routerlab”. Customer Access. The big picture. Phone Network. Phone Exchange. Point of Presence. Core Network. ATM Network. PPP-AC. DSLAM. Core Routers. Access Router. DSL Router. Customer Datacenter. Datacenter. Modem. Splitter. Home Network. Accessing the Net. PPPoE

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Presentation Transcript
the big picture
The big picture

Phone Network

Phone Exchange

Point of Presence

Core Network

ATM Network

PPP-AC

DSLAM

Core Routers

Access Router

DSL Router

Customer Datacenter

Datacenter

Modem

Splitter

Home Network

accessing the net
Accessing the Net

PPPoE

Connection

ATM Circuit

IP Data

Phone Exchange

Point of Presence

Core Network

ATM Network

PPP-AC

DSLAM

Core Routers

Access Router

DSL Connection

DSL Router

Customer Datacenter

Datacenter

Modem

Splitter

RADIUS

Auth. Request

Home Network

ppp point to point protocol
PPP – Point-to-Point Protocol
  • Encapsulates other protocols (tunnel)
  • Enables AAA (authentication, authorization, accounting)
  • Supports auto-configuration
  • We consider IP over PPPoE (PPP over Ethernet)
phases of ppp
Phases of PPP

No

Established

successful?

Need

authentication?

Link

Establishment

Phase

Authentication

Phase

Yes

Link

Dead

Yes

No

Authentication

successful?

Link

Termination

Phase

Network-Layer

Protocol Phase

Yes

No

pppoe frame
PPPoE Frame

0x8863: PPPoE Discovery

0x8864: PPPoE Session

Ethernet Frame

Data

Dst. Addr

Src. Addr

Type

PPPoE

0x00: Data

0x07: PADO

0x09: PADI

0x19: PADR

0x65: PADS

0xa7: PADT

Always 0x1

Always 0x1

Announced in PADS Frame,

before: 0x0000

Version

(4 Bit)

Type

(4 Bit)

Code

(1 Byte)

Session-ID

(2 Byte)

Length

(2 Byte)

PPP Protocol

(2 Byte)

Payload Length in Bytes

0x0021: IP

0x8021: IP Control Prot. (IPCP)

0xc021: Link Control Prot. (LCP)

0xc023: Password Auth. Prot. (PAP)

0xc223: Challenge Handshake

Auth. Prot. (CHAP)

Payload

(variable)

pppoe session
PPPoE Session

DSL-AC

Client

PPPoE Active Discovery (AD) Initiation: PADI

Broadcast Packet, optional: Service-Name

PPPoE AD Offer: PADO

Service-Name, AC-Name

If multiple PADO:

Choose one

PPPoE AD Request: PADR

Service-Name, AC-Name

PPPoE AD Session Confirmation: PADS

Session-ID

  • PPP Session
  • PPP Session handshake (LCP), including authentication
  • IP configuration (IPCP)
  • IP Session (Payload)

Set local IP configuration

Authenticate user and

authorize session

PPPoE AD Termination

Can be sent by either side

Record

accounting data

radius
RADIUS
  • “Remote Authentication Dial-In User Service”
  • Central RADIUS Server
  • Provides authentication service for Network Access Servers (NAS)
  • NAS: Every device that a user can use to connect to a network, e.g:

PPP-AC, WPA access-point, 802.1x switch

ppp session with radius
PPP Session with RADIUS

Client

PPP-AC/NAS

Auth. Server

LCP: Conf Request

Auth. Proto: PAP

LCP: Conf Ack

Auth. Proto: PAP

RADIUS: Access Request

Username + Password

PAP: Auth Request

Username + Password

  • RADIUS: Access Accept
  • Attributes:
  • IP Address
  • ….

PAP: Auth Ack

Username + Password

IPCP: Conf Req.

IP: 0.0.0.0

  • RADIUS: Accounting Start
  • Attributes:
  • IP Address
  • Session ID
  • ….

IPCP: Conf Reject

IP: 1.2.3.4

Write accounting

record

  • RADIUS: Accounting Stop
  • Attributes:
  • Session ID
  • Duration,Traffic Volume

LCP: Terminate Link

Write accounting

record

excurse other providers
Excurse: Other providers

Point of Presence

Datacenter

Core Network

PPP-AC

Access Router

Phone Exchange

Point of Presence

Core Network

ATM Network

PPP-AC

DSLAM

Core Routers

Access Router

DSL Router

Customer Datacenter

Datacenter

Modem

Splitter

Home Network

the smaller picture
The smaller picture

Phone Network

Point of Presence

loadgen10X

Phone Exchange

Point of Presence

Core Network

ATM Network

PPP-AC

DSLAM

Core Routers

Access Router

DSL Router

Customer Datacenter

Datacenter

Modem

Splitter

Home Network

the smaller picture1
The smaller picture

Point of Presence

loadgen10X

rj1

PPP-AC

Access Router

DSL Router

Customer Datacenter

Loadgen103

VLAN 102

Home Network