Allocations for "always-on" ISPs

"Wilfried Woeber, UniVie/ACOnet" wrote:
> 
> [ individual addresses stripped... ]
> 
>   Leigh,
> 
> =From: Leigh Porter <leigh at insnet.net>
> =Subject: Re: Allocations for "always-on" ISPs
> =
> ="Neil J. McRae" wrote:
> =
> =And if they need address space the ASP knows, about, they can use some
> =kind of tunneling mechanism
> 
>   ...now I'm lost!
>   What is the _some_ in "some kind of tunneling mechanism? And how do you
>   propose to take care of the re-configuration on the customer's end for
>   the tunnel? Dynamic DNS with TTL close to 0? Whater it is, it should be
>   available for all of the "popular" operating systems, btw.

Why do you need dynamic DNS? The user turns their box on, their DSL is
up and
their tunnel client connects to the tunnel server at the ASP site, gets
an address
and knows how to route to the ASP network and the ASP network knows how
to get
to the users machine.

GRE/IPIP tunnels are very avaliable, not sure about pptp though or
anything else
that could be used.

> =back to the ASP network so they have consistant addressing, even if their
> =providor uses dynamic addressing.
> 
>   Which requires some sort of (non-trivial?) static routing entries on the
>   customer's end nodes and/or some sort of routing support by the "basic"
>   transport provider.

No, the ASP network just needs to know that it gets to its customers
down tunnels
and the customers box should have software intelligent enough to do 
"route add 10.9.8.0/24 gw tunnel1"
Then anything for the ASP gets to go down the tunnel right to their
front door and
anything for the net goes out the usual route via their NAT things.

It also does a lot for security because the ASP boxes do not have to be
on routable address
space. I do not know what kind of clients these ASP things use though.

This is being used now, how do you think lots of people get to their
corporate
networks from their hotel/whatever dialups? They use pptp or somethig
like that,
connect to the net, then to their pptp server and talk to their company
VPN
over that, encrypted probobly.

--
Leigh Porter
C&W