Hi all,
I've a CentOS box which as two NIC; this box is also a router for LAN subnet:
------------------------------------ | eth0 (external) 172.0.0.1 | | eth1 (internal) 192.168.1.1 | ------------------------------------ | LAN clients (192.168.1.2+)
I want to allow http acces only for two LAN boxes; an only http access, which means that others protocols as smtp, pop3, imap and so on will be permited. The rest of LAN boxes will be redirected to a local http service (192.168.1.1:80)
I think the best way is creating a iptables rules based on MAC address. So, the rules I've made are:
iptables -t nat -A PREROUTING -p tcp -s 192.168.1.0/24 -m mac --mac-source ! xx:xx:xx:xx:xx:xx --dport 80 -j DNAT --to-destination 192.168.1.1:80
iptables -t nat -A PREROUTING -p tcp -s 192.168.1.0/24 -m mac --mac-source ! xx:xx:xx:xx:xx:xx --dport 80 -j DNAT --to-destination 192.168.1.1:80
Please, note the exclamation symbol, which means a logical negation.
But it seems doesn't work correctly: all the LAN clients can suffer the web.
¿?¿?¿