🚀 go-pugleaf

>> The thing is very simple.. do not try to complicate it too much :)
>> 1) On your gateway you should have two interfaces: one with address in your
>> old subnet, the other with address in your new address, e.g. 192.168.0.1
>> mask 255.255.0.0.
>
>Where do I add the information for the second interface? On my linux
>machine, do I simply add another gateway entry in the
>/etc/sysconfig/network file by adding a line: 
>
>GATEWAY=192.168.0.1

You don't need a new default gateway on the gateway itself.
Keep the old one (gateway related to the old subnet).

The "GATEWAY=192.168.0.1" should appear only on the
machines in the new subnet 192.168.x.x

>> 2) define a NAT (masquarade) on the 192.168 network - you have to do that
>> since 192.168 netwok can not be seen from the internet
>
>Can someone tell me where to add the requisite information under linux
>to define a NAT?  I am using IP tables and I have a firewall script. I
>think I may have to put a line in my firewall script, something like: 
>

You need something like:

iptables -t nat -A POSTROUTING -o $YOUR_EXTERNAL_INTERFACE -j SNAT 
        --to-source $YOUR_EXTERNAL_IP

and the control what you want to forward with the 
FORWARD chain.

>Would this both forward as well as masquerade to 192.168.0.0/24? 
>
>> 3) enable IP forwarding
>
>Hopefully the above line takes care of that? Can someone correct that
>line if it is wrong? 
>

No. You have to tell it to the kernel with

echo '1' > /proc/sys/net/ipv4/ip_forward

Take a look at the HOWTOS in http://www.netfilter.org


	Bye

		Pietro