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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. 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);

Listmanager

Custom email list manager, running on Erasmus. 2 lists were doing queries to ldap.terena.org. Unfortunately the Net::LDAP in Ubuntu Hardy (libnet-ldap-perl) is too old and does not recognise the inet6 paramater. Hacked Fixed by copying /usr/share/perl5/Net/LDAP.pm from a Lucid box.