[Gllug] ADSL2 router help / recomendation

[Chris Bell]

On Wed 24 Jan, t.clarke wrote:
> My understanding is that the Router DOES require an IP address on its
> 'external' interface.
> Our ISP actually provides two IP addresses for the line  (which sort of
> alias to each other it seems).
> Offhand I think the router uses one of those addresses on its external
> interface and the Linux box uses the other address on its external interface
> (to the router).
> 
> Maybe some routers work differently ?
> 
> Tim
> 


   My understanding is that it may need an IP address, but not neccessarily
a public one. The deciding factor may be at the BT end of an ADSL link.
There are several possibilities, including

RFC 3330 - Special-Use IPv4 Addresses
  169.254.0.0/16 is a reserved block for link local addresses

  224.0.0.1 is a special address which means all interfaces connected to the
  network, and may be used by a router as it attempts to identify possible
  connections.


-- 
Chris Bell

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