Network maintainance on dragonflybsd.org

[Saifi Khan]

On Tue, 27 Oct 2009, Matthew Dillon wrote:

>     There is going to be some serious restructuring of my subnet some
>     time in the next two weeks.  Theoretically I'll be drilled through
>     my cable modem while my DSL is down 
> ...
> 

and from the IRC log

>
> 08:51 < dillon> dragonfly network may be sporatic for the next
> hour or two, we're moving it to a tunnel over the cable modem
> so the DSL can be worked on ...


Please accept my apologies as this is a newbie query

.  is the requirement of tunnel related to setup of a static
tunnel IP for mail/web over a DSL connection ?

.  is the tunnel like GRE or IP/IP ?


thanks
Saifi.