What's the state of SIP and IPv6? - An update I gave at the Netnod spring Meeting 2015. Nothing much is happening, despite the fact that we have proven real issues with dual stacks in SIP.

1. 😀
Staying Happy in SIP
@oej | #NetNodMeeting 2015 spring
or “Does IPv6 affect application level protocols?”

2. 😀 Happy Eyeballs.
IPv4
IPv6
IPv4
IPv6

4. HTTPThe Internet world is more than one protocol.

5. SIPThe world of realtime communication

6. SIP in one slide
• Locate service by using DNS Naptr, SRV
• Set up connections using TCP (TLS) and UDP
• Media is 99.99% UDP

7. RFC 3261 - published 2002

8. Does SIP have a
problem too?

9. Testing Asterisk IPv6.
Thank you to Uninett for sponsoring these tests.
??? Strange stuff…

10. Testing at SIPit
INTEROPERABILITY

11. Problems to check
Find best working media
path
Set up connection to
signalling
Set up best connection
between users
Dual stack, IPv4 only, IPv6
only, multiple IPv6

12. Yes!
And we use a lot of connectionless UDP.
Happy Eyeballs affects SIP too.

13. Crashes. No
connections.
IPv6 in the route set.
IPv6 in the SDP
IPv6 in DNS
DUAL STACK

14. Even for IPv4-only SIP
user agents.

15. Of course someone is
going to fix this.

16. <wait>

17. Oh no. I’m someone.

18. Of course everyone else
will join and fix this
quickly.

19. Hmmm…

20. Media: ICE!
I’ll show you mine and you
show me yours!
Handles dual stack issues by
accident.
http://www.slideshare.net/oej/sip-2012-ice-nat-traversal-for-media
Solution for NAT traversal

21. Summarized my thoughts in 2011.
slideshare.net/oej
http://edvina.net/sipv6 Twitter @sipv6

22. No reaction.

23. Put pressure on the
SIP Forum

24. Became co-chair of the
SIP Forum
IPv6 working group.

25. FLOW
RFC 3261 defines a URI
RFC 3263 defines how to
use the URI to find next hop
RFC 2782 Defines DNS SRV
records

26. Fun fact
RFC 2782 is prepared for
AAAAAAAAAAAA
records.
DNS SRV records

27. “OR”
RFC 3263

28. Spread like virus
Many RFCs say
IPv4 orIPv6
Developers read this and
use when implementing.

29. DoS Attack
For an IETF newbie it felt like a
😩
“OR” != “OR”

30. Why do they behave
like this?
ABBA: Money, money, money.

31. Drafts
• Development: Advice to developers of IPv4 only
SIP ua:s
• DNS: Locating SIP services in dual stack
networks
• Coming (if I get energy): Happy Earbuds:
Setting up SIP connections in a dual stack
network
No action.
SIPCORE WG Action item.
In my head.

32. Drafts getting nowhere
• No one seems interested in fixing this
• Not a real world problem - chicken and egg
issue.
• IPv6 will not get deployed in SIP unless we solve
issues with IPv6.
• Hard to get time in a two-person company…

33. Last SIPit - 2014 fall
Tested IPv6 source address
selection No client or server did it
correctly.
Not a single one.
All the other problems
persisted.

34. Summary
• Happy eyeballs-like issues exist in a lot of
protocols
• May be issues apart from just the connection
(like SIP DNS SRV)
• Who’s looking into this?
• If you want to help with funding my work in the IETF - please contact me.

35. Thank you.
@oej oej@edvina.net slideshare.net/oej