sip and ipv6 - can they get along?
DESCRIPTION
With World IPv6 Launch happening June 6, 2012, production IPv6 network connectivity will be available to many more businesses and individuals. Major web sites and content providers will all enable IPv6 access to their content. Consumer electronics manufacturers are committing to providing IPv6-enabled devices.What does this mean for SIP-based real-time communications? How well does SIP work with IPv6 today? What are the challenges to deployment and what steps can be taken to overcome those challenges? What should operators and vendors consider with regard to SIP and IPv6? What software, devices and tools are available to assist? And what case studies and other information is available?In this session at SIPNOC 2012 on June 26, 2012, in Herndon, Virginia, Dan York discussed all of these points and provided concrete suggestions for moving forward with SIP and IPv6.TRANSCRIPT
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SIP and IPv6 – Can They Get Along?
SIP Network Operators Conference (SIPNOC) June 26, 2012
Dan York Senior Content Strategist
[email protected] +1-802-735-1624
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Dan York
www.danyork.me
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www.worldipv6launch.org/infographic/
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The Good News!
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IPv6 Works Fine!
Linphone – http://www.linphone.org Open source, free and available for Linux, Windows and MacOS X
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Linphone and IPv6
Linphone – http://www.linphone.org Open source, free and available for Linux, Windows and MacOS X
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More SIP Softphones Supporting IPv6
Jitsi (formerly SIP Communicator)
§ www.jitsi.org
Counterpath Bria
§ www.counterpath.com
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In Fact, There Are Many More:
IP Phones (Desktop): • Avaya (unclear on exact models)
• Mitel 53xx Series • Mocet • Siemens OpenStage • Snom
IP-PBXs/Call Servers • Asterisk 1.8+ • Brekeke SIP • Cisco Unified Communications
Manager 7.1 • Freeswitch 1.1+ • Kamailio 3.1+ • OpenSIPS • Voxeo Prophecy and PRISM
Other SIP Devices • Cisco SIP Gateways ( ISR 28XX
& 38XX, AS5400 ) • Mediatrix • Mitel Border Gateway (MBG)
SIP Services (in the cloud) • INUM.net
8
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Why IPv6?
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In The Beginning...
192.168.20.12
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Mobility
www.flickr.com/photos/kapungo/3396823518/
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A Plethora of Portable Platforms
www.flickr.com/photos/clonedmilkmen/5111779335/
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Internet of Things
www.flickr.com/photos/dmje/5159177886/
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Internet of Things
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Internet of Things
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EVERYTHING over
IP
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Only 2 Billion People Are Online –
What About The Other 5 Billion?
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How IP Address Allocation Works
Regional Internet Registries (RIRs)
Internet Service Providers (ISPs)
You
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Global IPv4 Disparity !
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Oops... as of Feb 1, 2011...
Regional Internet Registries (RIRs)
Internet Service Providers (ISPs)
You
All Gone!
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Solutions?
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IPv4 Marketplace
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Prolonging IPv4 - NAT Today
Firewall
ISP
Internet Firewall
IP Phone
PC
Home Firewall
Home
Public IP NAT
Private IP Addresses
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Carrier Grade NAT (a.k.a. LSN)
ISP
Internet Firewall
IP Phone
PC
Home Firewall
Home
Public IP NAT
Private IP Addresses
Firewall
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Old NATs Never Die...
ISP
Internet Firewall
IP Phone
PC
Home Firewall
Home
Public IP NAT
Private IP Addresses
Firewall
NAT Private IP Addresses
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The Problem?
SIP NAT
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Oh, and by the way...
(sorry... we still have NAT-like networks with IPv6...)
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And then there is...
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IPv6 Challenges: User Interfaces
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See the problem?
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See the problem?
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IPv4
192.168.20.12
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IPv6
2001:db8:34a5:23:aa1f:12f4:9009:1234
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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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IPv6 Addresses
127.0.0.1 ::1
0.0.0.0 ::
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DNS is your friend!
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IPv6 Challenges: Port Numbers
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IPv4 Port Numbers
192.168.20.12:5060
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IPv4 Port Numbers in IPv6?
192.168.20.12:5060
2001:db8:34a5::1234:5060
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IPv6 Port Numbers
[2001:db8:34a5::1234]:5060
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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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IPv6 Challenge: Multiple Addresses
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IPv4 – Single Address / Interface
192.168.20.12
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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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IPv6 – Neighbor Discovery
No More DHCP For Address Assignment
(well, unless you want it)
Router Advertisements vs ARP
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IPv6 – Address Creation
2001:db8:34a5:92:21c:a5ff:fe12:3a80
Router Advertisement
Autoconfiguration from Ethernet Address
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The Key Point…
Can Your Device/Software/Etc. Work With Multiple IP Addresses?
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IPv6 Challenges: DNS
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IPv4 and DNS
example.com 3600 IN A 192.168.20.12
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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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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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UNhappy Eyeballs
You
DNS Svr
example.com A 192.168.20.12 example.com AAAA 2001:db8:34a5::1234
AAAA
(a long time later...)
A
?
?
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Happy Eyeballs
You
DNS Svr
example.com A 192.168.20.12 example.com AAAA 2001:db8:34a5::1234
AAAA
A ?
?
(sent at same time; whichever replies first wins)
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Happy Eyeballs
RFC 6555 tools.ietf.org/html/rfc6555
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IPv6 Challenges: Storing IP Addresses
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How Do You Store IP Addresses?
Memory? Databases?
Config Files?
Room for two? (or more?)
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Config Files
<category name="SIP">
<item name="Server1">127.0.0.1:5060 </item>
</category>
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IPv6 and SIP
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RFC 6157
RFC 6157 “IPv6 Transition in the Session
Initiation Protocol (SIP)” tools.ietf.org/html/rfc6157
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SIP Architecture
SIP Proxy
A
Alice Bob Media (RTP, MSRP, etc.)
SIP SIP
SIP Proxy
B SIP
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SIP Reality
Internet (or WAN)
Alice Bob Media
SIP SIP
SIP Proxy
A SIP
SIP Proxy
B
SIP Proxy
N
SIP Proxy
D SIP
SIP Proxy
C SIP SIP
Media Proxy
A
Media Proxy
B Media Media
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“SIP” = Multiple Protocols
SIP SDP
RTP
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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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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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NAT, NAT, NAT...
STUN, TURN, ICE
(RFC 5245)
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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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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
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SIP Forum “IPv6” Mailing List
sipforum.org/mailman/listinfo/ipv6
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SIPit Test Events
sipit.net
SIPit 28: “68% of the implementations present supported IPv6.”
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Get Started With IPv6...
Deploy360 Programme
www.internetsociety.org/deploy360
![Page 71: SIP and IPv6 - Can They Get Along?](https://reader034.vdocuments.net/reader034/viewer/2022052307/5555d37ed8b42a711f8b4b5b/html5/thumbnails/71.jpg)
www.internetsociety.org/deploy360/
SIP Forum “IPv6” Mailing List
sipforum.org/mailman/listinfo/ipv6
![Page 72: SIP and IPv6 - Can They Get Along?](https://reader034.vdocuments.net/reader034/viewer/2022052307/5555d37ed8b42a711f8b4b5b/html5/thumbnails/72.jpg)
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
![Page 73: SIP and IPv6 - Can They Get Along?](https://reader034.vdocuments.net/reader034/viewer/2022052307/5555d37ed8b42a711f8b4b5b/html5/thumbnails/73.jpg)
www.internetsociety.org
[email protected] +1-802-735-1624
Dan York Senior Content Strategist Internet Society
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