On Thursday 13 March 2003 11:45 am, Charles Steinkuehler wrote:
> OK, so you want port-forwarding on the router, rather than any sort of
> DMZ setup.
>
> You can probably get this to work, but the configuration details may
> require some experimentation.
>
> I know Dachstein can run with multiple networks on the same interface,
> as I have done that several times.  I don't think you actually have two
> networks on your upstream link, but instead have one network with a
> block of IP's routed to you.  This has the potential to confuse the
> equipment upstream if you assign the extra IP's directly to the external
> interface.

Thanks Charles, I wasn't aware this was possible on different subnets
because of the resulting netmask used w/o hardcoding everything and
bypassing parts of the scripts. 

My concern is that the 206.127.76.231/27 and the block of 206.127.77.48/28
are not at all within the mask range of his ISP. If you change the
outgoing netmask to accept both blocks, then your also accepting a
ton of addresses that aren't yours.


> The "normal" way to do this would be to assign public IP's to the
> desired desktop systems, but this is not necessarily ideal from either a
> network topology (I'm assuming you have additional machines you do *NOT*
> which to connect to, and limited IP space), or a security standpoint.

If you can get the external interface to respond to the ip's, then you
could simply 1-to-1 proxy-arp or static-NAT them to the machines inside and
filter out everything but the desired protocol(s). Using static-NAT would
also allow the machines to participate as normal LAN machines as well.
-- 
~Lynn Avants
Linux Embedded Appliance Firewall Developer
http://leaf.sourceforge.net
http://www.guitarlynn.homelinux.org:81


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