1.
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/

2.
Dan York
www.internetsociety.org/deploy360/
www.danyork.me
www.internetsociety.org/deploy360/

3.
www.worldipv6launch.org/infographic/
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4.
The Good News!
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5.
IPv6 Works Fine!
Linphone – http://www.linphone.org
Open source, free and available for Linux, Windows and MacOS X
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6.
Linphone and IPv6
Linphone – http://www.linphone.org
Open source, free and available for Linux, Windows and MacOS X
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7.
More SIP Softphones Supporting IPv6
Jitsi (formerly SIP Communicator)
§ www.jitsi.org
Counterpath Bria
§ www.counterpath.com
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8.
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/

9.
Why IPv6?
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10.
In The Beginning...
192.168.20.12
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11.
Mobility
www.flickr.com/photos/kapungo/3396823518/
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12.
A Plethora of Portable Platforms
www.flickr.com/photos/clonedmilkmen/5111779335/
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13.
Internet of Things
www.flickr.com/photos/dmje/5159177886/
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14.
Internet of Things
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15.
Internet of Things
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16.
EVERYTHING
over
IP
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17.
Only 2 Billion People
Are Online –
What About The
Other 5 Billion?
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18.
How IP Address Allocation Works
Regional Internet Registries (RIRs)
Internet Service Providers (ISPs)
You
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19.
Global IPv4 Disparity !
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20.
Oops... as of Feb 1, 2011...
All Gone!
Regional Internet Registries (RIRs)
Internet Service Providers (ISPs)
You
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21.
Solutions?
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22.
IPv4 Marketplace
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23.
Prolonging IPv4 - NAT Today
NAT
Public
IP
Private
IP
Addresses
PC
Home
Internet Firewall Firewall
Firewall
IP
ISP
Phone
Home
www.internetsociety.org/deploy360/

24.
Carrier Grade NAT (a.k.a. LSN)
NAT
Public
IP
Private
IP
Addresses
PC
Home
Internet Firewall Firewall
Firewall
IP
ISP
Phone
Home
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25.
Old NATs Never Die...
NAT
NAT
Public
IP
Private
IP
Private
IP
Addresses
Addresses
PC
Home
Internet Firewall Firewall
Firewall
IP
ISP
Phone
Home
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26.
The Problem?
SIP NAT
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27.
Oh, and by the way...
(sorry... we still have NAT-like networks with IPv6...)
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28.
And then there is...
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29.
IPv6 Challenges:
User Interfaces
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30.
See the problem?
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31.
See the problem?
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32.
IPv4
192.168.20.12
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33.
IPv6
2001:db8:34a5:23:aa1f:12f4:9009:1234
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34.
IPv6 Address Compression
2001:db8:34a5:0:0:0:0:1
2001:db8:34a5::1
(oh, and they aren’t case-sensitive)
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35.
IPv6 Addresses
127.0.0.1 ::1
0.0.0.0 ::
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36.
DNS is your friend!
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37.
IPv6 Challenges:
Port Numbers
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38.
IPv4 Port Numbers
192.168.20.12:5060
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39.
IPv4 Port Numbers in IPv6?
192.168.20.12:5060
2001:db8:34a5::1234:5060
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40.
IPv6 Port Numbers
[2001:db8:34a5::1234]:5060
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41.
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
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42.
IPv6 Challenge:
Multiple Addresses
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43.
IPv4 – Single Address / Interface
192.168.20.12
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44.
IPv6 – Multiple Addresses / Interface
192.168.20.12
2001:db8:34a5:92:21c:a5ff:fe12:3a80
(global)
fe80::21c:a5ff:fe12:3a80
(link-local)
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45.
IPv6 – Neighbor Discovery
No More DHCP For Address
Assignment
(well, unless you want it)
Router Advertisements vs ARP
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46.
IPv6 – Address Creation
Router Advertisement
2001:db8:34a5:92:21c:a5ff:fe12:3a80
Autoconfiguration from
Ethernet Address
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47.
The Key Point…
Can Your Device/Software/Etc. Work
With Multiple IP Addresses?
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48.
IPv6 Challenges:
DNS
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49.
IPv4 and DNS
example.com 3600 IN A 192.168.20.12
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50.
IPv6 and DNS
example.com 3600 IN A 192.168.20.12
example.com 3600 IN AAAA 2001:db8:34a5::1234
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51.
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)
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52.
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
?
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53.
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)
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54.
Happy Eyeballs
RFC 6555
tools.ietf.org/html/rfc6555
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55.
IPv6 Challenges:
Storing IP Addresses
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56.
How Do You Store IP Addresses?
Memory?
Databases?
Config Files?
Room for two? (or more?)
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57.
Config Files
<category name="SIP">
<item name="Server1">127.0.0.1:5060
</item>
</category>
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58.
IPv6 and SIP
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59.
RFC 6157
RFC 6157
“IPv6 Transition in the Session
Initiation Protocol (SIP)”
tools.ietf.org/html/rfc6157
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60.
SIP Architecture
SIP SIP
Proxy Proxy
A SIP B
SIP SIP
Alice Bob
Media (RTP, MSRP, etc.)
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61.
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
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62.
“SIP” = Multiple Protocols
SIP
SDP
RTP
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63.
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
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64.
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
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65.
NAT, NAT, NAT...
STUN, TURN, ICE
(RFC 5245)
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66.
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)
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67.
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
www.internetsociety.org/deploy360/

68.
SIP Forum “IPv6” Mailing List
sipforum.org/mailman/listinfo/ipv6
www.internetsociety.org/deploy360/

69.
SIPit Test Events
sipit.net
SIPit 28: “68% of the implementations present supported IPv6.”
www.internetsociety.org/deploy360/

70.
Get Started With IPv6...
Deploy360 Programme
www.internetsociety.org/deploy360
www.internetsociety.org/deploy360/

71.
SIP Forum “IPv6” Mailing List
sipforum.org/mailman/listinfo/ipv6
www.internetsociety.org/deploy360/

72.
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
www.internetsociety.org/deploy360/

73.
Dan York
Senior Content Strategist
Internet Society
york@isoc.org
+1-802-735-1624
Thank You!
www.internetsociety.org/deploy360
twitter.com/deploy360
facebook.com/deploy360
www.internetsociety.org