IP over Networks

dingdongboomNetworking and Communications

Oct 27, 2013 (3 years and 11 months ago)

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IP
-
over
-
Networks.ppt 9/98 H. Almay page:
1


IP over Networks

GSM

PSTN / ISDN

IP Network

Services

Direct IP

Access

Broadband

Access

(ADSL)

Remote IP access


IP over LAN


IP in the Backbone


LAN

Backbone

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
2


Internet Access in Europe

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
3




full time remote worker




part time remote worker



day extenders


-

A D S L
-

I S D N
-

analog modems
-

mobile data . . .

Source: GartnerGroup, March 1998

Worldwide growth in remote work

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
4


Remote IP Access Architecture

PSTN/ISDN

Mobile


User

Intranets /

Extranets

Internet

POTS

ISDN

CCB

NMS

GSM

IP Network

Other IP Networks

AAA
-
server

Access

Server

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
5


PSTN/ISDN

Mobile


Direct Access

Remote IP Access: ISDN, PSTN, ADSL, GSM

Intranets /

Extranets

Internet

POTS ADSL

ISDN

CCB

NMS

GSM

IP Service

Other IP Networks

AAA
-
server

RAN

Eksos B

Access Node

Access Server

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
6


ISDN BRA subscriber configurations

Router

LAN

PC with

ISDN card

ISDN

telephone

with data

interface

ISDN NT

S bus

ISDN access router:

Other

ISDN

devices

ISDN NT

S bus

Other

ISDN

devices

ISDN NT

S bus

Other

ISDN

devices

ISDN telephone with

data interface:

ISDN PC card:

ISDN S

Up to 4

Ethernet ports

Up to 2

a/b ports for POTS

ISDN S

Data

interface (RS232)

ISDN S

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
7



Universal dial
-
in access:


2 x ISDN PRI can terminate up to 60 calls:



-

analog modem, V.110 for GSM cellular data, ISDN


Scaleable architecture


Data network connections:



-

1 x Ethernet (AUI) port



-

2 x Sychronous serial ports for WAN connections


Management remotely via SNMP / Local terminal


RADIUS


Wide range of security features


19'' mechanics




Example Access Server

-

for small netwoks/ GSM data
-

ISDN/PSTN

2 x 2M (PRI)

2 serial

ports

Ethernet

IP Network

Cisco

AS 5200

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
8


AAA
-
server

Billing System

files

SNMP


Access

Server

RADIUS

Operator

Intranet

Administrator

HTML

MML,HTML


Authentication, Authorization, Accounting


Statistics


Security Management

Subscriber profile

management:

Management

integrated into

NMS

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
9


PPP
-

Point
-
to
-
point protocol


+
----------
+
----------
+
----------
+
----------
+
------------

| Flag | Address | Control | Protocol | Information

| 01111110 | 11111111 | 00000011 | 16 bits | *

+
----------
+
----------
+
----------
+
----------
+
------------


---
+
----------
+
----------
+
-----------------


| FCS | Flag | Inter
-
frame Fill


| 16 bits | 01111110 | or next Address


---
+
----------
+
----------
+
-----------------


transmitting datagrams using serial point
-
to
-
point links:



method for encapsulating datagrams over serial links



Link Control Protocol



Family of Network Control Protocols

0021 Internet Protocol

0023 OSI Network Layer

002b Novell IPX

8021 Internet Protocol Control


Protocol

c021 Link Control Protocol

c023 Password Authentication


Protocol

c025 Link Quality Report

c223 Challenge Handshake


Authentication Protocol


wide variety of applications/extensions:



PPP over ISDN, SDH, X.25, Frame Relay...



PPP multilink protocol

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
10


Remote IP access related ISDN/PSTN Issues

End
-
to
-
end:


Modem protocols

300 bps
-

56000
bps


Rate adaptation

V.110, V.120


Error correction


Compression

ISDN/PSTN dimensioning


long calls


short calls


unsuccessfull calls


correlated traffic (hot spots)

?
effects of new applications

?
data call bypass

NTC/Home office ISDN number of lines used (7/98)

IP
-
over
-
Networks.ppt 9/98 H. Almay page:
11


Security

Standard level:


Authentication and authorization


Level two tunneling

(Virtual private networks)

Corporate level:


data encryption


strong authentication
(one time passwords)

?
Usability (e.g. how to
connect to company
external services)

?
Legislation