Re: NAT

[daniel <daniel@debian-gnu.com>]

Adrian Berardi wrote:
> Hi, i'm a new debian user, and without too much experience in linux.
> I'm trying to install a Debian here at home to use it as internet access 
> for a couple windows PCs.
> Someone told me that i had to install first the two eth, then configure 
> the networkcards, then install dhcp3 (for the PCs to get a dinamic ip), 
> and then do NAT (iptables)
> Everything worked OK, but it is not the case of the NAT: i can access 
> internet from de debian, but i dont know how to configure or what to 
> install for access internet from the windows PCs through the Debian.
> Any comment will be kindly accepted.!
> Best regards, Adrian
>  
> Adrian



that I recall, basic stuff you need is:

In your iptables init script you need to have this:
echo "1" > /proc/sys/net/ipv4/ip_forward

check if the file /proc/sys/net/ipv4/ip_forward is "1", if not then it 
wont allow packet forwarding

also I have something like this:
iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 
ipofyourdebianinternetinterface

And this:
iptables -P FORWARD -j ACCEPT

Though I am not an expert and you could get more info about 
routing/forwarding with iptables at http://netfilter.samba.org

Good luck


--
-daniel
http://www.debian-gnu.com