survey of ipv6 enabled services

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SURVEY OF IPV6 ENABLED SERVICES

Mark Prior, Liaison APAC R&E CommunityAPAN 27, 4 March 2009


Motivation

Talk by Ron Broersma, DREN, at the Joint Techs Meeting at Fermilab (July 2007)

Very easy to deploy a single “router” announcing an IPv6 prefix

Harder to deploy services Public services do NOT imply IPv6 enablement of

an organisation but do illustrate some commitment– Public services often on a DMZ rather than inside the

organisation’s network


Services Examined

Need to be services provided to the “public”– Expected to be accessible from the Internet

Web service (HTTP) Mail delivery service (SMTP) Domain Name service (DNS) Instant Messenger (Jabber) Network Time service (NTP)


Web Service

Test the accessibility of a web service Look for a AAAA record on– www.example.com– www.ipv6.example.com– ipv6.example.com– www6.example.com– www.example6.com

If AAAA record exists then connect to it and issues a HTTP 1.1 HEAD command

Try to follow any redirects 200 code = success– No test that the IPv6 and IPv4 service are the same thing


Mail Delivery service

Test delivery of email to the domain over IPv6 List the MX for the domain If there is a AAAA then attempt to connect to it Send EHLO greeting Claim victory and QUIT if response looks OK Test primary MX first but fall back and test the

secondary MX if primary fails Partial success if the secondary supports IPv6– Could be called “SUCCESS” as IPv6 only host can

deliver email but dual stack will use IPv4 instead


Domain Name service

Find out the Domain Name servers for the domain Look for AAAA record on each of them For each AAAA send a SOA query for the domain Try to classify if the server is managed by the

domain name holder or if it is off site Success if each of the servers has an IPv6 version– No guarantee that the IPv6 servers are the same systems

as the IPv4 ones– Multiple servers using the same address are noticed but

not reported


Instant Messenger service

No guarantees that this will exist as a public service

Look for SRV for _xmpp-client._tcp.example.com If it exists is there a AAAA record for it? Try to connect to it using the port in the SRV


Network Time service

No guarantee that this will exist as a public service No defined way to find the service so guess using

ntp.example.com and then ntp.ipv6.example.com If there is a A record then look for a AAAA too If it exists then use ntpdate to query the server and

check the status returned Stratum between 1 and 15 is considered success


Pulling this together

A perl script is run twice a week from a dual stack system in Adelaide

Creates a web page with the results

Feedback that organisations have been motivated to try to go green


Future Work

Would be good to test RTT and Path MTU, comparing result with IPv4

Try to identify tunnels and sub optimal paths


Where’s the web page?

Currently very few Asian organisations tested– An artifact of original motivation rather than a lack of

interest in doing it Of course there are a lot more Chinese Universities than

New Zealand ones!– Send me email if you want your organisation to be added

to the list!– Send me perl code if you can do RTT and/or Path MTU

testing in perl (on a Solaris 8 system)

http://www.mrp.net/IPv6_Survey.html





Contact Info

Mark PriorLiaison, APAC R&E CommunityJuniper Networks

[email protected]@mrp.net

survey of ipv6 enabled services

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