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All linux servers use IPv6 resolvers

Only statically configured IPv6 addresses in /etc/resolv.conf

All linux managed by SSH on IPv6 only

Configure ListenAddress :: in sshd_config.

All linux servers run Postfix on IPv6 only (except public mail server)

Remove IPv4 address from $mynetworks, and set inet_protocols = ipv6

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Nagios runs only on IPv6

Configure Listen [2001:610:158:98d::42]:80 in /etc/apache/ports.conf.

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Entire host IPv6 (removed IPv4 address and A record)

svn.terena.org

PECL radius

IPv6 doesn't work. Needed for TERENA web site. Considering rewriting code to use LDAP.

apt-get

security.ubuntu.com does not work, so no security updates. Workaround: use local mirror nl.archive.ubuntu.com for security updates.

Pear Net_Socket

Does not like IPv6 addresses, wrote patch.

ntp

ntp.ubuntu.com does not work. Use our own NTP server graham.terena.org, or one of the many SURFnet chimes.

ntp

dumps core without IPv4 loopback address. Keep legacy 127.0.0.1 address

Confluence and JIRA LDAP auth via IPv6 = b0rked

Workaround: use IPv6 only hostname: ldap.ipv6.terena.org

Radiator

Cannot use IPv6 LDAP server. Files Filed support ticket at Open.com.au. Fixed as of 2011-02-12. Also make sure to add flags to any custom perl hooks:
my $ldap = Net::LDAP->new('ldap://ldap.terena.org',inet6=>1);

Autoconfiguring name servers does not work for Mac OS X

Macs need manually configured name servers, boo!

CIFS client on Mac OS X does not support IPv6

Unable to file bug report due to lame web site ("An error has occurred. Please report the error to Apple Inc. by emailing the error detail to devbugs@apple.com.")

CyberDuck does not work with IPv6 hostnames

Use either literal IPv6 address, or IPv6-only host name godzilla.ipv6.terena.org.
Fixed in 4.0