SIP and IPv6 - Can They Get Along?

SIP and IPv6 – Can They Get Along?

SIP Network Operators Conference (SIPNOC)
June 26, 2012

Dan York
Senior Content Strategist

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

www.internetsociety.org/deploy360/

Dan York


www.danyork.me

www.worldipv6launch.org/infographic/


The Good News!


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


More SIP Softphones Supporting IPv6

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

Counterpath Bria

§  www.counterpath.com


In Fact, There Are Many More:
IP Phones (Desktop): Other SIP Devices
•  Avaya (unclear on exact models) •  Cisco SIP Gateways ( ISR 28XX
•  Mitel 53xx Series & 38XX, AS5400 )
•  Mocet •  Mediatrix
•  Siemens OpenStage
•  Mitel Border Gateway (MBG)
•  Snom

IP-PBXs/Call Servers
•  Asterisk 1.8+ SIP Services (in the cloud)
•  Brekeke SIP •  INUM.net
•  Cisco Unified Communications
Manager 7.1
•  Freeswitch 1.1+
•  Kamailio 3.1+
•  OpenSIPS
•  Voxeo Prophecy and PRISM

8 www.internetsociety.org/deploy360/

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


Only 2 Billion People
Are Online –

What About The
Other 5 Billion?

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


The Key Point…

Can Your Device/Software/Etc. Work
With Multiple IP Addresses?


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

RFC 6555
tools.ietf.org/html/rfc6555


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


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 IETF but used
in US military’s AS-SIP

§  draft-boucadair-mmusic-altc-05 – “Alternate Connectivity
Attribute”

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


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 IPv6...

Deploy360 Programme
www.internetsociety.org/deploy360


Attend the IPv6 BOF Tomorrow…
12:45-1:30pm
•  Exchange of experiences
•  Should SIP Forum charter a working group?
•  What could working group do?
•  Document existing best practices for working with SIP over IPv6
(perhaps in the form of a short whitepaper or document).
•  Identify current technical issues with using SIP over IPv6.
•  Maintain/develop a list of IPv6-enabled SIP/VoIP software/
hardware/services.
•  Identify/develop case studies about successful migration of SIP
services to IPv6


Dan York
Senior Content Strategist
Internet Society

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

Thank You!
www.internetsociety.org/deploy360

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facebook.com/deploy360

www.internetsociety.org

SIP and IPv6 - Can They Get Along?

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