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Re: iptable in fc5



> On Mon, 2006-05-15 at 14:27 -0500, Hongwei Li wrote:
>> Hi,
>>
>> I have a question about iptables in fc5. I have iptables 1.3.5-1.2
>> installed.
>> By default, the iptables has a line
>> -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
>> ... and
>> -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
>>
>> I try to add the port 2049 for our lan nfs by adding aline before the above
>> reject line:
>>
>
> You're also going to need to unblock ports for portmapper, mountd,
> rquotad, and (maybe) rstatd and nfslockd.  I don't use the last two on
> my home systems.
>
> Create a file on the server at /etc/sysconfig/nfs that will bind mountd
> and rquotad to fixed ports (I use 922 and 923, but you don't have to).
>
> [root petrel ~]# cat /etc/sysconfig/nfs
> export MOUNTD_PORT=922
> export RQUOTAD_PORT=923
>
> Then, in /etc/sysconfig/iptables, add the following rules (change the -s
> address as appropriate, or remove it altogether):
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p tcp --dport 922 -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p udp --dport 922 -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p tcp --dport 923 -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p udp --dport 923 -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p tcp --dport 111 -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p udp --dport 111 -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p tcp --dport 2049 -j ACCEPT
> -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A RH-Firewall-1-INPUT -s 192.168.1.0/24 -m state --state NEW -m tcp -p
> tcp --dport 22 -j ACCEPT
> -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> COMMIT
>

Thanks a lot for you and Chris's help, I created /etc/sysconfig/nfs, did what
you suggested and now it is working.

A few more quations about iptables setting:

1. What's difference if I put some lines like
-A RH-Firewall-1-INPUT -s 192.168.1.0/24 -p tcp --dport 2049 -j ACCEPT
before line
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
or put it in between it and the following line:
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited

2. When do we need to include "-m state --state NEW" or "-m state --state
NEW,ESTABLISHED,RELATED" or "-m state --state ESTABLISHED,RELATED" in a line?
Will they cause different functions?

3. For those lines with "-m state --state NEW" etc., should I put them before
line
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
or after it?

Thanks!

Hongwei



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