IP Networking

i have a firewall with two interfaces eth0 and eth1, eth0 is connected to an external network, and eth0 is connected to a private lan.
im using this command for NAT

iptables -A POSTROUTING -t nat -s 192.168.0.0/24 -o eth0 -j SNAT --to-source 223.0.0.3

my questions are :

1) how can i check if the translation is being done correctly ?
2) can i use PAT in UNIX ?

Use a sniffer (tcpdump, ethereal) on the destination, for instance.
I think you can.

Regards.

You can simply see if it is going well ( IP translation ) , using an external web-page to see what IP are you shown . If you are shown the external IP , it work's ...

What do you mean by PAT , unde Linux systems ? Do you mean CISCO router's PAT ? I think you do .

You can simply use MASQUERADE ( MASQ ) - depending of your kernel version / iptables version or NAPT ..

PAT is the process , of translationg TCP/UDP pachets' IP address ..

I don't think you can , you must ( if you want ).


Cheer's !

I forgot to mention that in Linux you can also have a look at /proc/net/ip_conntrack

You don't really have to, but anyway you can

Regards.

thanks guys, it worked.
well yeah what i meant by PAT is masqurade
i didnt know what is it called in unix