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All linux servers use IPv6 resolvers

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

All linux servers run SSH on IPv6 only

Configure ListenAddress :: in sshd_config.
After backporting patch this also works on Ubuntu 8.04.

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

Remove IPv4 address from $mynetworks, and set inet_protocols = ipv6
Pear Net_Socket does not like IPv6 addresses, wrote patch.

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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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Radius

In progress.

Entire host IPv6 only

System svn.terena.org is IPv6. Removed IPv4 address.
security.ubuntu.com does not work, so automatic security updates do not work. Bug is still open, but not much action is being undertaken. Simple workaround: use the local mirror nl.archive.ubuntu.com for security updates.