Just like with IPv4, DHIS accepts updates of IPv6 addresses; the two are independent which means that you can have both an IPv4 and an IPv6 address pointing to your same unique hostname under dhis.org. Here is how it works:
Please See: Configuration Guides : DHIS on a UNIX server with wget and cron for examples of how to update IPv6 addresses using wget.
6to4 addresses are IPv6 addreses used in 6to4 tunnening to encapsulate IPv6 over IPv4. They are somehow special because they encapsulate the v4 address in the v6 address and allow tunnels to be configured automatically. 6to4 addresses always start with the 2002::/16 anycast prefix.
By default the DHIS server recognises 6to4 addresses and when you submit an update from one of these sources, it constructs your IPv4 address (looks at the embedded address) and also updates your IPv4 DNS A record. This means that you will update 2 addresses (1xIPv4 and 1xIPv6) with a single update request.
In order to disable this behaviour and perform an IPv6 only update using a 6to4 address, you can use the Update6to4V4=No HTTP form variable to signal it to the server.
The following URL will update your 6to4 address without updating its corrresponding IPv4 address:
Next Topic: Live Web Updates