> with this:
> 
> iface eth0 inet6 static
>            address 2a03:9800:10:54::2
>            netmask 65
>            gateway 2a03:9800:10:54::1
> 
> Leave all the other entries intact.
> Then invoke this as root (one-time only):
> 
> ip a d dev eth0 2a03:9800:10:54::2/64
> ip a a dev eth0 2a03:9800:10:54::2/65
> ip ro d default via 2a03:9800:10:54::1

  This will need to be repeated at every reboot, better to use `up`, for
 example:

    iface eth0 ...
        ...
        gateway ...
        up ip -6 addr  ..

  "up" will run the given command after the interface is brought up, as
 per "man 5 interfaces".

Steve
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