testing eyeball happiness fred baker. the issue i bring to your attention in dual stack networks,...

Testing Eyeball Happiness

Fred Baker

The issue I bring to your attention In dual stack networks, especially if BCP 38 is in use,

opening a session can be slow: Code samples using getaddinfo() read:

list = getaddrinfo(…);

for each address in listAttempt to open a connection

If success, break

end for That is equivalent to

list = getaddrinfo(…);

for each address in listsleep (3);

end for

Common customer support recommendation: “turn IPv6 off and you won’t have that problem”

Papers of interest TCP's Reaction to Soft Errors.

Gont. February 2009 RFC 5461, Informational

Happy Eyeballs: Trending Towards Success with Dual-Stack Hosts Dan Wing, Andrew Yourtchenko, October 2010 draft-wing-v6ops-happy-eyeballs-ipv6

Opening TCP Sessions in Complex Environments Fred Baker, October 2010 draft-baker-v6ops-session-start-time

Testing Eyeball Happiness Baker, November 2010 draft-baker-bmwg-testing-eyeball-happiness

A proposed test: configuration

Each LAN is configured with one IPv4 and multiple IPv6 prefixes

Alice and Bob have A and AAAA records in DNS

Routers have appropriate routing Two routers used to make it

easy to null route

Alice: Unitunder Test

DNSBob:Correspondent

Router 1 Router 2

A proposed test: procedure Repeatedly reconfigure

Router 1 with various routing: Only IPv4 connectivity Only IPv6 connectivity using

each of Bob’s several prefixes

Use various blockages: Null route without ICMP

(black hole) Null route with ICMP

“destination unreachable” Filter with ICMP

“administratively suppressed”

Alice: Unitunder Test

DNSBob:Correspondent

Router 1 Router 2

A proposed test: expected outcome

Alice should be able to open a session with Bob, starting from the DNS lookup, within a predictable interval, regardless of address choice Not really testing the

application – presumed to work in existing networks

Outcomes: What is that interval? What is the difference

between those intervals

Alice: Unitunder Test

DNSBob:Correspondent

Router 1 Router 2

What I would like from BMWG

Sponsorship if bmwg is so inclined Advice on how best to construct the test