how to configure a router/firewall with no nat

"Carlos Rotenberg" <rotenberg@xxxxxxxxx> · Sat, 13 Jan 2007 12:40:24 -0500

I have to create a Firewall/Router with Iptables to protect our clients, but
I can't do NAT, my clients have to have Public IPs on their servers.
I was trying to figure out how to do that, but I couldn't get any clue.

The provider assigned me a /24 network and he gave me /30 network for the
external network, if someone can help me, I'll appreciate it.

Thank you,

Carlos

Example:
Router Network 200.200.199.0/30
Provider Router Ip address: 200.200.199.1
My Firewall/Router IP address: 200.200.199.2

Clients Network assigned: 200.200.200.0/24

      200.200.199.1/30              FIREWALL 200.200.200.1/28
200.200.200.0/27  
INTERNET  -----------------------   ROUTER
------------------------------------------  CLIENT 1 SERVERS
                  200.200.199.2/30  IPTABLES |
Default gateway: 200.200.200.1
                                             |
                                             |
                                             |
                                             | 200.200.200.33/28
200.200.200.32/28

------------------------------------------  CLIENT 2 SERVERS
                                             |
Default gateway: 200.200.200.33                                         |
                                             |
                                             |
                                             |
                                             | 200.200.200.65/27
200.200.200.64/27

------------------------------------------  CLIENT 3 SERVERS
                                             |
Default gateway: 200.200.200.65
                                             |
                                             |
                                             |
                                             | 200.200.200.129/25
200.200.200.128/25

------------------------------------------  CLIENT 4 SERVERS

Default gateway: 200.200.200.129