| e. marocco, g. canal lucent, 2006, 26 th october p2psip: interworking enrico marocco research...

| E. Marocco, G. Canal

Lucent, 2006, 26th October

P2PSIP: Interworking

Enrico MaroccoResearch Engineer

[email protected]


The World is Converging Mobile

802.11GSMGPRS

802.16UMTS


802.11GSMGPRS

802.16UMTS

But Mobile is becoming Ephemeral

ToothingCommunities

MunicipalFree WirelessNetworks

Ad-Hoc Networks


Limited or Ephemeral Network Environments

Characterized by physical constraints (e.g. space, time, number...) Limited diffusion Limited requirements (e.g. security, equipment...)

Highly specialized (e.g. messaging, gaming, ad-hoc applications...)

Almost isolated (or partially connected)

Collaborative Self-Sustained Cyber-Communities


Technology in Limited or Ephemeral Environments

Unstable links Cannot rely upon stable servers Need of distributed fault

tolerance (vs. single point of failure)

Missing or unconfigurable naming service

Cannot deploy stable servers Need of multiple access points

for resources (vs. centralization)

“Peer-to-Peer” Distribution of location and

routing services for communication

Distribution of storage service for file-sharing


Who Cares?

Telcos? Vendors?

AcademicsOpen Source

Users!

IGNORE?


Peer-to-Peer Limited or Ephemeral Networks

Pros

Ease of deployment Need common devices

Click 'n go

Costless Need cheap devices

No O&M

Increase of adoption AUTOCONF, MANET

Just Applications

Cons

Scarce security No identity assertion

No protection against malicious peers

Scarce connectivity Hard to go over locality

No Services


What can Operators do?

Ignore it In ephemeral environments service provisioning is not feasible Internet-like applications are out of core business

Fill the gaps Provide access-level service for upgrading reachability Provide “some” services to applications

Impede Filter P2P traffic whenever is possible Force the use of IMS


A Notable Example

Municipal Free Wireless

Mesh of APs on street lamps Full local connectivity Cheap – Sustainable 10-50 Mb/sec

Restricted Internet connection Must serve Ms of users Cannot support bandwidth-

eager applications

Internet

“full” IP

HTTP

SMTP

POP3


Municipal Free Wireless

Applications

Exploiting “global” connectivity Email Web browsing

Exploiting “local” connectivity File sharing VoIP

Internet

“full” IP

HTTP

SMTP

POP3


Municipal Free Wireless - VoIP

Cannot access the home network for call routing

Restricted connectivity

Cannot rely on central servers Link weakness Unaccessible configuration

Must rely on resources shared by users


P2PSIP: How It Works

P2PSIP Overlayrome.test.net

INVITE [email protected] [email protected]

[email protected] [email protected]


P2PSIP: What Is Missing

rome.test.net paris.test.org

REGISTER [email protected]

INVITE [email protected]

[email protected]

[email protected]@paris.test.net


P2PSIP: Providing Interworking

rome.test.net paris.test.org

REGISTER [email protected]

isp.test.comINVITE [email protected]

[email protected]

[email protected]


P2PSIP: Actors

ClientsPeers

Super Peers

Relay Agents

Proxies


P2PSIP: Architecture

p2psip.org

SIPSI

Plocation

location

loca

tion

DNSlocation


P2PSIP: New Elements

Proxy

Access to the Internet E.g. peers with DSL access

Registered in the DNS with the overlay identifier Semi-stable Open issue: how to register?

Client/Peer Must be able to route

messages

Media Relay

Access to the Internet E.g. host with DSL access

Must implement a relay mechanism TURN, TEREDO


P2PSIP: Interworking 1/2

p2psip.org

sip:[email protected]

sip:example.com


Get Pro

xy

Get Relay

INVITE

Media

RFC3263

ICE


P2PSIP: Interworking 2/2

p2psip.org


sip:example.com


Get Pro

xy

Get Relay

Media

RFC3263

INVITE


P2PSIP: Providing More Than Transport

YES

Identity

Gateways

Presence service

Conferencing

Voice mail

MAYBE

Emergency calls

Legal interception

No

QoS


Do Not Repeat The Same Old Mistakes

Do not understimate This applies to municipal and building networks, but could also extend

to big Internet communities (Skype-like)

Go for a standard P2P solution Remember the lesson learned from IM&P (ICQ + AIM + MSN +

Yahoo!)

Keep it open IMS is SIP based; let it also be SIP compliant

It is not services vs. applications Voice is both a service and an application


Some Pointers

Municipal Free Wireless Networks MuniWireless Web Portal (http://www.muniwireless.com/) Earthlink Municipal Networks Web Page (http://www.emnwifi.net/)

P2PSIP P2PSIP Project Page (http://p2psip.org) Concept and terminology (draft-willis-p2psip-concepts) SIP-P2PSIP Interworking (draft-marocco-p2psip-interwork)

IMS ;-)


Thank You!

Enrico [email protected]

http://sipdht.sourceforge.net

| e. marocco, g. canal lucent, 2006, 26 th october p2psip: interworking enrico marocco research...

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