iptables forwarding not working/iptables-save not saving

[Rick Stevens]

Antonio Olivares wrote:
> --- On Thu, 11/20/08, Antonio Olivares <olivares14031 at yahoo.com> wrote:
> 
>> From: Antonio Olivares <olivares14031 at yahoo.com>
>> Subject: iptables forwarding not working/iptables-save not saving
>> To: fedora-test-list at redhat.com
>> Date: Thursday, November 20, 2008, 12:21 PM
>> Dear fellow testers,
>>
>> I am trying to setup a little dhcp server at school for my
>> machines that my students use at school.  Iptables is not
>> saving :(
>>
>> [root at localhost ~]# rpm -qa iptables*
>> iptables-1.4.1.1-2.fc10.i386
>> iptables-ipv6-1.4.1.1-2.fc10.i386
>>
>>
>> Thanks,
>>
>> Antonio 
>>
>>
>>       
>>
>> -- 
> 
> Sorry for double post :(  Yahoo mail was misbehaving :(  
> Here's some info to clarify things 
> 
> [root at localhost ~]# service iptables stop
> iptables: Flushing firewall rules:                         [  OK  ]
> iptables: Setting chains to policy ACCEPT: nat filter      [  OK  ]
> iptables: Unloading modules:                               [  OK  ]
> [root at localhost ~]# iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT [1]+  Done                    gedit /etc/sysconfig/iptables       
> [root at localhost ~]# iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT                                                         
> [root at localhost ~]# iptables -A POSTROUTING -t nat -s 192.168.1.0/24 -o eth0 -j SNAT --to-source 10.154.19.210                                         
> [root at localhost ~]# iptables-save
> # Generated by iptables-save v1.4.1.1 on Thu Nov 20 13:14:50 2008
> *nat                                                             
> :PREROUTING ACCEPT [5:692]                                       
> :POSTROUTING ACCEPT [0:0]                                       
> :OUTPUT ACCEPT [0:0]                                             
> -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j SNAT --to-source 10.154.19.210
> COMMIT                                                                     
> # Completed on Thu Nov 20 13:14:50 2008                                   
> # Generated by iptables-save v1.4.1.1 on Thu Nov 20 13:14:50 2008         
> *filter                                                                   
> :INPUT ACCEPT [2483:1813687]                                               
> :FORWARD ACCEPT [0:0]                                                     
> :OUTPUT ACCEPT [2598:1049836]                                             
> -A FORWARD -i eth1 -o eth0 -j ACCEPT                                       
> -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT 
> COMMIT                                                                     
> # Completed on Thu Nov 20 13:14:50 2008                                   
> [root at localhost ~]# service iptables restart
> iptables: Flushing firewall rules:                         [  OK  ]
> iptables: Setting chains to policy ACCEPT: nat filter      [  OK  ]
> iptables: Unloading modules:                               [  OK  ]
> iptables: Applying firewall rules:                         [  OK  ]
> iptables: Loading additional modules: ip_conntrack_netbios_[  OK  ]
> [root at localhost ~]# service dhcpd start                           
> Starting dhcpd:                                            [  OK  ]
> [root at localhost ~]#
> 
> The iptables get back to original state.  error in iptables-save ?/bug
> 
> [root at localhost ~]# cat /etc/sysconfig/iptables
> # Firewall configuration written by system-config-securitylevel
> # Manual customization of this file is not recommended.
> *filter
> :INPUT ACCEPT [0:0]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [0:0]
> :RH-Firewall-1-INPUT - [0:0]
> -A INPUT -j RH-Firewall-1-INPUT
> -A RH-Firewall-1-INPUT -i lo -j ACCEPT
> -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
> -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
> -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
> -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
> -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
> -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
> -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
> -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> -A FORWARD -j REJECT --reject-with icmp-host-prohibited
> COMMIT

Look at my response CAREFULLY.  It said:

	iptables-save >/etc/sysconfig/iptables

iptables-save spits the stuff to your terminal.  You must redirect it
to the /etc/sysconfig/iptables file so the iptables-restore command
that's run at boot time can get the data back.

Alternately, you can use "service iptables save" to save your changes.
The command I gave above is essentially what this "service" command
does.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer                      ricks at nerd.com -
- AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
-                                                                    -
-     Squawk!  Pieces of Seven!  Pieces of Seven!  Parity Error!     -
----------------------------------------------------------------------