Re: Forward packets from one interface to another?

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Yeah, but I find that's more complicated than adding a static route to the
upstream router.  The only time I would use that solution is if I didn't
have the ability to add a static route.


Brad


On Tue, 3 Feb 2009, Rick Jones wrote:

> bsilva wrote:
> > You can use either routing/forwarding or bridging for this problem,
> > however, bridging is simpler in many ways.  If you use bridging, there is
> > are fewer impacts on the design of the rest of your network.  If you use
> > routing, then the router that connects the PC with two interfaces to the
> > Internet needs to know about the network on the other side of the PC
> > (in a small network this can be done by adding a static route).
> >
> > So, in this example:
> >
> > -----------                -----------                  -----------
> > | Router/ |                |   PC    |                  |   PC    |
> > | Firewall|.1    Net A  .10| with 2  |.10    Net B   .11| with 1  |
> > |   to    |----------------|  NICs   |------------------|  NIC    |
> > | Internet|  192.168.1.0   -----------   192.168.2.0    -----------
> > -----------
> > Each network is /24 (netmask of 255.255.255.0)
> >
>
> If instead, you further subnettted 192.168.1 with a /25 on the PCs (but still a
> /24 on the router), the Router/Firewall wouldn't have to know about the other
> subnet.  It could just blythly ass-u-me that the end-PC was on the same network
> segment as the middle PC.  So long as the middle PC was configured with a static,
> public ARP entry for the IP of the end PC, and had ip_forwarding enabled, it
> would "front" for the end PC.
>
> rickjones
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