iptables and ip6tables

[Antonio M]

I am confused about these two services:
I have a computer acting as firewall/router running on F8.
When I installed F8 I inserted my backup copy of iptables that is:

# Generated by iptables-save v1.2.6a on Fri Feb 21 09:27:33 2003
*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE
# Forward HTTP connections to Squid proxy
-A PREROUTING -p tcp -m tcp -i eth0 --dport 80 -j REDIRECT --to-ports 3128
COMMIT
# Completed on Fri Feb 21 09:27:33 2003
# Generated by iptables-save v1.2.6a on Fri Feb 21 09:27:33 2003
*mangle
:PREROUTING ACCEPT [9:432]
:INPUT ACCEPT [3:234]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [9:684]
:POSTROUTING ACCEPT [17:1292]
COMMIT
# Completed on Fri Feb 21 09:27:33 2003
# Generated by iptables-save v1.2.6a on Fri Feb 21 09:27:33 2003
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth0 -j ACCEPT
-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -i eth0 -j ACCEPT
COMMIT
# Completed on Fri Feb 21 09:27:33 2003

and I didn't care about ip6tables.
My ip6tables is:
# Firewall configuration written by system-config-firewall
# 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 ipv6-icmp -j ACCEPT
-A RH-Firewall-1-INPUT -m ipv6header --header 50 -j ACCEPT
-A RH-Firewall-1-INPUT -m ipv6header --header 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 5353 -d ff02::fb -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 icmp6-adm-prohibited
-A FORWARD -j REJECT --reject-with icmp6-adm-prohibited
COMMIT

the two are completely different.

I made a crazy try replacing ip6tables content with iptables content and I
restarted ip6tables but I get:
ip6tables failed. The error was: ip6tables: Unloading modules: [  OK  ]
ip6tables: Applying firewall rules: ip6tables-restore v1.3.8:
ip6tables-restore: unable to initialize table 'nat'

Error occurred at line: 2
Try `ip6tables-restore -h' or 'ip6tables-restore --help' for more
information.
[FALLITO]

why?? how iptables and ip6tables should match???
-- 
Antonio Montagnani
Skype : antoniomontag
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