Download - SIP and IPv6 - Can They Get Along?

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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


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): •  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


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...

Regional Internet Registries (RIRs)

Internet Service Providers (ISPs)

You

All Gone!


Solutions?


IPv4 Marketplace


Prolonging IPv4 - NAT Today

Firewall

ISP

Internet Firewall

IP Phone

PC

Home Firewall

Home

Public IP NAT

Private IP Addresses


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

ISP

Internet Firewall

IP Phone

PC

Home Firewall

Home

Public IP NAT


Firewall


Old NATs Never Die...

ISP

Internet Firewall

IP Phone

PC

Home Firewall

Home

Public IP NAT


Firewall

NAT Private IP Addresses


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

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

Router Advertisement

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

You

DNS Svr

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

AAAA

(a long time later...)

A

?

?


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)


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 Proxy

A

Alice Bob Media (RTP, MSRP, etc.)

SIP SIP

SIP Proxy

B SIP


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


“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


SIP Forum “IPv6” Mailing List

sipforum.org/mailman/listinfo/ipv6


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

[email protected] +1-802-735-1624

Dan York Senior Content Strategist Internet Society

Thank You! www.internetsociety.org/deploy360

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Download - SIP and IPv6 - Can They Get Along?

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