onfigure firewall in etch

[leo <leonardo@softel.cu>]

On Mon, 2001-12-31 at 10:33 -0700, leo wrote:
> hello,
> 
> is there any problem configuring a firewall in an dhcp client machine
> when an IP address change every time I reboot. In the firewall rules I
> denied (DROP) all incoming and OUTCOMING packet messages and after that
> this line:
> 
> iptables -A INPUT -s 192.168.16.118 -j ACCEPT
> iptables -A OUTPUT -d 192.168.16.118 -j ACCEPT
> 
> lets my IP address can do anything although in the next reboot this IP
> changes so that line will not be valid anymore
> 
> my idea to fix this is copying this IP to an enviroment variable (with
> export command?) to use it in my firewall rules script taking it's value
> for example: 
> 
> iptables -A INPUT -s $myIP -j ACCEPT
> iptables -A OUTPUT -d $myIP -j ACCEPT
> 
> the part I don't know is how can I copy the IP address from boot
> 
>