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Old 05-13-2005, 04:31 AM   #1
Stefan Pantiru
LQ Newbie
Registered: Apr 2004
Location: Iasi, Romania
Distribution: Gentoo && Fedora
Posts: 9

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NAT + public IPS (+ firestarter)

I know there are some other posts like this, but I couldn't really find a solution... so here I am asking again...

Using Fedora Core 3...

I have my linux box (2 nics) sharing my Internet connection to my LAN. I used Firestarter to do that easely.

All ok....

But now, I've got public IP's for every computer in my LAN (round 15 PCs). So what do I have to do to have public ips asigned to my lan PCs?

suppose my public ip is

I tried something like this:
iptables -t nat -A PREROUTING -d -j DNAT --to-destination
iptables -t nat -A POSTROUTING -s -j SNAT --to-source
to asign the public ip to my local IP, but it's not really working... I cannot ping from Internet... and a site like "what's my ip" will only see my router's ip not the nat-ed ones...

i believe firestarter has nothing to do with this...

any ideas how this job SHOULD be done?

I tried adding this:

route add -net netmask dev eth1
eth1 being the nic connected to the ISP
still no succes...

Last edited by Stefan Pantiru; 05-13-2005 at 07:18 AM.
Old 05-14-2005, 01:24 AM   #2
Registered: Apr 2005
Location: india
Distribution: Redhat 9
Posts: 66

Rep: Reputation: 15
hi Stefan Pantiru,
i could not get what exactly u want to do ???
suppose u have 15 internal PCs with public IPs, u need not configure NAT bcoz all r public IPs. simple configure each host with its ip & SPECIFY the route & DNS on each host. thats it. if i am n't wrong.
Old 05-17-2005, 05:43 AM   #3
Stefan Pantiru
LQ Newbie
Registered: Apr 2004
Location: Iasi, Romania
Distribution: Gentoo && Fedora
Posts: 9

Original Poster
Rep: Reputation: 0
I tried that... i couldn't make it work, maybe the fact that there was the same netmask on my both nics then... i don't know...
Anyway, I abandoned the idea... it would have bine nice to have a clear solution about how could this sort of "mapping" could be done, though...

thx for the answer, jkmartha!

Last edited by Stefan Pantiru; 05-17-2005 at 05:45 AM.


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