[sclug] Routed IP/CIDR etc

[Chris Aitken]

> On Thu, Jul 15, 2004 at 05:43:46PM +0100, Chris Aitken wrote:
> > My router, when operated in half bridge mode, will present 
> the router 
> > IP (xx.xx.xx.94) on both the ATM & the ethernet interfaces
> 
> > My firewall box is xx.xx.xx.93, and SNATs for my LAN, and does DNAT 
> > (hopefully soon) for the rest of the Ips (xx.xx.xx.89 - 
> xx.xx.xx.92).
> 
> > Simon has a single static IP, and his setup is slightly different 
> > (maybe you can remind me!).
> 
> This Simon has a single static IP too :)
> 
> > How would you go about setting up a firewall/router box to do the 
> > same, but with a single IP?
> 
> Mine does PPP half bridging over a cross over cable to my 
> linux box which does DHCP to the router[0].  The router gives 
> my linux box my public IP and I then run iptables on the 
> linux box with the public IP.  It also sorts out NAT for me.
> 
> It would work fine if the router could reconnect reliably 
> when in PPP half bridge mode but it doesn't seem to.  Still 
> my ADSL doesn't disappear often.
> 
> Is this what you mean or did I miss the point entirely?
> 
> Simon.
> 
> [0] I'd love to configure it staticly but it doesn't seem to 
> want to do
>     PPP half bridging if I do.

That would be what I was on about. But how does your router give the public
IP to your iptables box? Is the box a DHCP client to the router?

Chris


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