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