How IPv6 Impacts SIP and Telecom

How IPv6 Impacts SIP
and Telecom

Dan York
Senior Content Strategist, DO Hub
york@isoc.org
+1-802-735-1624

www.internetsociety.org

Dan York

www.danyork.com
The Internet Society

My Recent Change

DO Hub Project

york@isoc.org
+1-802-735-1624


Why IPv6?


In The Beginning...

192.168.20.12


Mobility

www.flickr.com/photos/kapungo/3396823518/

A Plethora of Portable Platforms

www.flickr.com/photos/clonedmilkmen/5111779335/

Internet of Things

www.flickr.com/photos/dmje/5159177886/

Internet of Things


EVERYTHING
over
IP


How IP Address Allocation Works

Regional Internet Registries (RIRs)

Internet Service Providers (ISPs)

You


Global IPv4 Disparity !


Oops... as of Feb 1, 2011...

All Gone!

Regional Internet Registries (RIRs)

Internet Service Providers (ISPs)

You


Solutions?


IPv4 Marketplace


Prolonging IPv4 - NAT Today

NAT

Public
IP
Private
IP

Addresses

PC

Home
Internet Firewall Firewall
Firewall

IP
ISP
Phone
Home


Carrier Grade NAT (a.k.a. LSN)

NAT

Public
IP
Private
IP

Addresses

PC

Home
Firewall

IP
ISP
Phone
Home


Old NATs Never Die...

NAT
NAT

Public
IP
Private
IP
Private
IP

Addresses
Addresses

PC

Home
Firewall

IP
ISP
Phone
Home


The Problem?

SIP NAT


Oh, and by the way...

(sorry... we still have NAT-like networks with IPv6...)


And then there is...


IPv6 Challenges:
User Interfaces


See the problem?


IPv4

192.168.20.12


IPv6

2001:db8:34a5:23:aa1f:12f4:9009:1234


IPv6 Address Compression

2001:db8:34a5:0:0:0:0:1
2001:db8:34a5::1

(oh, and they aren’t case-sensitive)


IPv6 Addresses

127.0.0.1 ::1

0.0.0.0 ::


DNS is your friend!


IPv6 Challenges:
Port Numbers


IPv4 Port Numbers

192.168.20.12:5060


IPv4 Port Numbers in IPv6?

192.168.20.12:5060

2001:db8:34a5::1234:5060


IPv6 Port Numbers

[2001:db8:34a5::1234]:5060


IPv6 addressing

http://[2001:db8:34a5::1234]/index.html
http://[2001:db8:34a5::1234]:8080

sip:dan@[2001:db8:34a5::1234]
sip:dan@[2001:db8:34a5::1234]:5060


IPv6 Challenge:
Multiple Addresses


IPv4 – Single Address / Interface

192.168.20.12


IPv6 – Multiple Addresses / Interface

192.168.20.12

2001:db8:34a5:92:21c:a5ff:fe12:3a80
(global)
fe80::21c:a5ff:fe12:3a80
(link-local)


IPv6 – Neighbor Discovery

No More DHCP For Address
Assignment
(well, unless you want it)

Router Advertisements vs ARP


IPv6 – Address Creation

Router Advertisement

2001:db8:34a5:92:21c:a5ff:fe12:3a80

Autoconfiguration from
Ethernet Address


IPv6 Challenges:
DNS


IPv4 and DNS

example.com 3600 IN A 192.168.20.12


IPv6 and DNS

example.com 3600 IN A 192.168.20.12

example.com 3600 IN AAAA 2001:db8:34a5::1234


IPv6 DNS Fun

What if DNS gives a AAAA....

but your system doesn’t have
“real” IPv6 connectivity?

(You can retrieve AAAA records over IPv4)


UNhappy Eyeballs

DNS
Svr

example.com A 192.168.20.12
example.com AAAA 2001:db8:34a5::1234
AAAA
?

You (a long time later...)

A
?


Happy Eyeballs

DNS
Svr

example.com A 192.168.20.12
example.com AAAA 2001:db8:34a5::1234
AAAA
?
A
?
You

(sent at same time;
whichever replies first wins)


Happy Eyeballs

draft-ietf-v6ops-happy-eyeballs


IPv6 Challenges:
Storing IP Addresses


How Do You Store IP Addresses?

Memory?
Databases?
Config Files?

Room for two? (or more?)

Config Files

<category name="SIP">
<item name="Server1">127.0.0.1:5060
</item>
</category>


IPv6 and SIP


IPv6 Works Fine!

Linphone – http://www.linphone.org
Open source, free and available for Linux, Windows and MacOS X


Linphone and IPv6

Linphone – http://www.linphone.org
Open source, free and available for Linux, Windows and MacOS X


RFC 6157

RFC 6157
“IPv6 Transition in the Session
Initiation Protocol (SIP)”
tools.ietf.org/html/rfc6157


SIP Architecture

SIP SIP
Proxy Proxy
A SIP B

SIP SIP

Alice Bob
Media (RTP, MSRP, etc.)


SIP Reality

SIP SIP SIP SIP SIP
Proxy Proxy Proxy Proxy Proxy
A SIP B SIP C SIP D SIP N

SIP Internet (or WAN) SIP

Media Media
Alice Proxy Proxy Bob
Media A Media B Media


“SIP” = Multiple Protocols

SIP
SDP
RTP

IPv4/IPv6 Fun

Communicating between IPv4 client and IPv6 client
through a proxy
§  Record-Route: <sip:2001:db8::1;lr>

§  Record-Route: <sip:192.0.2.1;lr>

Mixed communication across a path of proxies

Mixed communication: IPv6 for SIP, IPv4 for media


IPv6 and SDP

Only allows a single IP address per media stream (“c=“
parameter)
§  c=IN IP4 192.168.20.12

§  c=IN IP6 2001:db8:34a5::1234

Multiple proposals for additional SDP parameters
§  ex. ANAT - RFC 4091 & 4092 – now deprecated by ICE

The IETF way forward is ICE – RFC 5245


NAT, NAT, NAT...

STUN, TURN, ICE

(RFC 5245)


Discovery of SIP Servers

User agents need to find SIP servers/proxies

DHCPv6
§  SIP Options in RFC 3319

DNS SRV, NAPTR and AAAA Records (RFC 3263)


Other IPv6 Considerations

Other interfaces
§  Web and management systems

§  Logging

§  APIs

Custom SIP headers

Multi-vendor interoperability

SBC and firewall support for SIP over IPv6


SIPNOC 2011 IPv6 BOF
April 2011 BOF at SIPNOC 2011 in Herndon, VA

Identified potential actions:

§  Migration plans: collecting and publicizing plans that are available, helping
find others

§  Identification of interoperability tests or test plans that include IPv6 and SIP

§  Providing case studies of successful migrations

§  Listing SIP-related tools/services/products that support IPv6

§  General education around IPv6 and SIP / real-time communication

Created new mailing list:

§  sipforum.org/mailman/listinfo/ipv6


SIP Forum “IPv6” Mailing List

sipforum.org/mailman/listinfo/ipv6


SIPit Test Events

sipit.net

SIPit 28: “68% of the implementations present supported IPv6.”


Get Started With SIP and IPv6...

http://bit.ly/voxeoipv6


Set up Test Lab or your Home Office

http://tunnelbroker.net

www.test-ipv6.com
www.ipv6-test.com


SIP Softphones Supporting IPv6

Linphone
§  www.linphone.org

Jitsi (formerly SIP Communicator)
§  www.jitsi.org


Olle Would Want Me To Mention...

Asterisk 1.8


Voxeo Application Platforms

Voxeo Prophecy 10.1
§  Standards-based platform for speech, IVR and SIP applications
§  Downloads and installs in minutes; Scales from 2 ports to 10’s
of thousands of ports
§  World’s most compatible and compliant VoiceXML and CCXML

Voxeo PRISM 10.1
§  Real-time Communications Application Server
§  Supports Converged SIP, Web and XMPP applications.
§  Carrier grade high performance platform with full support of high
availability and session replication

Free developer versions for Windows, Linux,
Mac OS X

www.voxeo.com/prophecy
www.voxeo.com/prism

73

A New Internet Society Initiative
Bridging the Divide Between IETF Standards and Industry-wide Deployment


Deployment & Operationalization (DO) Hub

Helps you

•  DO IPv6
•  DO DNSSEC
•  DO other future standards


What DO Hub Will Look Like

•  Online portals for new standards adoption
•  IPv6, DNSSEC, future standards topics
•  Knowledge base with deployment articles
•  Case studies
•  Blogs (deployment commentary)
•  Social media
•  Multiple languages

•  ION meeting series
•  Co-located with diverse set of events
•  Events being planned to reach each continent


When DO Hub Will Be Available

•  October 2011
•  Preview web presence release
•  Engagement with first adopters begins to create initial
knowledge base articles
•  First co-located ION event in Buenos Aires

•  December 2011
•  Official launch of DO Hub resource
•  First knowledge base articles published
•  Social media and blogging


How DO Hub Will Grow

•  New deployment articles will be added to the
knowledge base on a regular basis

•  Our blogs and social media efforts will provide an
ongoing conversation about deployment

•  We will feature the work of other groups

•  We will add features to this deployment resource in
response to feedback received from audiences


How to Participate

•  Help Create Content
•  We are working with first adopters and experts to
develop our materials
•  We will credit your work

•  Help Define New Features
•  We seek your valuable feedback on this deployment
resource
•  We have the flexibility to make changes/additions

•  Contact us: dohub@isoc.org


Dan York
Senior Content Strategist, DO Hub,
Internet Society

york@isoc.org
+1-802-735-1624

Thank You!
Follow us at:

twitter.com/InternetSociety

Facebook.com/InternetSociety


How IPv6 Impacts SIP and Telecom

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