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Re: set up NAT (network address translation) on local server



--- On Wed, 11/19/08, Antonio Olivares <olivares14031 yahoo com> wrote:

> From: Antonio Olivares <olivares14031 yahoo com>
> Subject: set up NAT (network address translation) on local server
> To: fedora-list redhat com
> Date: Wednesday, November 19, 2008, 12:59 PM
> Dear all,
> 
> Starting new thread to clear up the other one:
> Re: Make a DHCP server using Fedora - Help
> 
> After going through the steps outlined and the guidance
> provided by great individuals that participate in this list
> :)
> 
> /* Done now added eth1 to DHCPARGS */ 
> [olivares localhost ~]$ cat /etc/sysconfig/dhcpd
> DHCPDARGS=eth1
> 
> 
> I need a little bit of help in setting up NAT.  I can use
> the system-config-firewall or I can try using webmin or from
> command line, I feel I can achieve the goal.
> 
> How should I begin?
> 
> I had done this before, but because of other problems
> between the devices and my errors, it did not work :(
> 
> # Forward all packets from eth1 (internal network) to eth0
> (the public internet)
> iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
> # Forward packets that are part of existing and related
> connections from eth0 to eth1
> iptables -A FORWARD -i eth0 -o eth1 -m state --state
> ESTABLISHED,RELATED -j ACCEPT
> # Enable SNAT functionality on eth0. a.b.c.d are generally
> the ip of the eth0
> iptables -A POSTROUTING -t nat -s 192.168.1.0/24 -o eth0 -j
> SNAT --to-source a
> 
> Thank you for helping,
> 
> Regards,
> 
> Antonio 
> 
> 
>       
> 
> -- 
Sorry to reply to my own thread, but some might ask if I did the following and here's what I have done.  

Did this part : 

[olivares localhost ~]$ su -                    
Password:                                       
[root localhost ~]# service dhcpd restart       
Starting dhcpd:                                            [  OK  ]
[root localhost ~]# tail -f /var/log/messages                      
Nov 19 15:00:02 localhost dhcpd: Copyright 2004-2007 Internet Systems Consortium.                                                                               
Nov 19 15:00:02 localhost dhcpd: All rights reserved.                           
Nov 19 15:00:02 localhost dhcpd: For info, please visit http://www.isc.org/sw/dhcp/                                                                             
Nov 19 15:00:02 localhost dhcpd: Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file                         
Nov 19 15:00:02 localhost dhcpd: Wrote 2 leases to leases file.                 
Nov 19 15:00:02 localhost dhcpd: Listening on LPF/eth1/00:60:97:c5:2a:c3/192.168.0.0/24                                                                         
Nov 19 15:00:02 localhost dhcpd: Sending on   LPF/eth1/00:60:97:c5:2a:c3/192.168.0.0/24                                                                         
Nov 19 15:00:02 localhost dhcpd: Sending on   Socket/fallback/fallback-net      
Nov 19 15:00:06 localhost dhcpd: DHCPREQUEST for 192.168.0.3 from 00:11:2f:35:88:2e via eth1                                                                    
Nov 19 15:00:06 localhost dhcpd: DHCPACK on 192.168.0.3 to 00:11:2f:35:88:2e via eth1                                                                           
Nov 19 15:00:22 localhost dhcpd: DHCPDISCOVER from 00:d0:b7:c1:09:58 via eth1   
Nov 19 15:00:23 localhost dhcpd: DHCPOFFER on 192.168.0.2 to 00:d0:b7:c1:09:58 (6355-hthhzebqqx) via eth1                                                       
Nov 19 15:00:23 localhost dhcpd: DHCPREQUEST for 192.168.0.2 (192.168.0.1) from 00:d0:b7:c1:09:58 (6355-hthhzebqqx) via eth1                                    
Nov 19 15:00:23 localhost dhcpd: DHCPACK on 192.168.0.2 to 00:d0:b7:c1:09:58 (6355-hthhzebqqx) via eth1                                                         
Nov 19 15:00:33 localhost dhcpd: DHCPINFORM from 192.168.0.2 via eth1           
Nov 19 15:00:33 localhost dhcpd: DHCPACK to 192.168.0.2 (00:d0:b7:c1:09:58) via eth1                                                                            
Nov 19 15:00:37 localhost dhcpd: DHCPINFORM from 192.168.0.2 via eth1           
Nov 19 15:00:37 localhost dhcpd: DHCPACK to 192.168.0.2 (00:d0:b7:c1:09:58) via eth1                

>From one of the machines I get :

[olivares localhost ~]$ cat /media/STAPLES\ UFD/computer1.txt 

Windows 2000 IP Configuration

        Host Name . . . . . . . . . . . . : 6355-hthhzebqqx
        Primary DNS Suffix  . . . . . . . :                
        Node Type . . . . . . . . . . . . : Hybrid         
        IP Routing Enabled. . . . . . . . : No             
        WINS Proxy Enabled. . . . . . . . : No             

Ethernet adapter Local Area Connection:

        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Intel(R) 82559 Fast Ethernet LAN onMotherboard
        Physical Address. . . . . . . . . : 00-D0-B7-C1-09-58
        DHCP Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.0.2
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.0.1
        DHCP Server . . . . . . . . . . . : 192.168.0.1
        DNS Servers . . . . . . . . . . . : 10.154.16.130
                                            10.128.0.4
        Lease Obtained. . . . . . . . . . : Wednesday, November 19, 2008 2:57:58 PM
        Lease Expires . . . . . . . . . . : Wednesday, November 19, 2008 8:57:58 PM
[olivares localhost ~]$

DNS appear to be correct, but I cannot browse.  I am almost there.  Just a little thing here or there and it will be done :)

Regards,

Antonio 


      


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