Possibly OT since this may or may not involve Shorewall - it largely 
depends on what I can get to work !

I need to setup a router on an ASDL line where multiple IPs are 
provided by the ISP.

Hardware wise, we'd probably use a Linksys WRT54GL running OpenWRT 
and a Draytek Vigor 120 modem - we've used these before, but hardware 
is largely "whatever will do the job". But, the IP provided by the 
ISP to the PPPoE client is one of those AND all the connected devices 
must be on public IPs - so I need some sort of "bridged" setup.

Eg, the customers allocation is 192.0.2.0/27, 192.0.2.1 is given to 
the PPP client by the ISP, and the attached devices must be on 
192.0.2.2/27 and so on (each device is a router/firewall itself). The 
end result we need is that we present an ethernet port where the 
attached devices only need to know that 192.0.2.1/27 is the gateway.

This seems to be the most common setup supplied by UK ADSL providers. 
It's not been a problem where everything is NATted, but we're really 
struggling to find a setup that works reliably without NAT.

AFAICT, because the upstream is a PPP link, bridges and proxy-ARP are out.


-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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