Hi,
I tried more and doing this I can access to internet from a computer in
the local network:
iptables --flush
iptables --table nat --flush
iptables --delete-chain
iptables --table nat --delete-chain
iptables --table nat --append POSTROUTING --out-interface eth1 -j MASQUERADE
iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE
But the computer is viewed with the NAT router external local IP.
I need to have internal computers viewed with a different IP external
address.
Patrick
Le 16/02/2010 13:19, Patrick Chemla a écrit :
Hi,
I have problems to setup a NAT router using iptables.
My NAT Router is running Fedora 11.
I have 2 interfaces, eth0 10.0.0.1 is internal, eth1 172.25.2.2 is
external.
I have 10 external public addresses coming to the interface eth1 that
I want to forward to 10 internal computers on eth0.
When I try to ping or access an external web server from the NAT
server itself, it works very fine. I see on the remote server the
external address of the NAT router itself.
When I try to ping or wget an external web server from an internal
10.0.0.151 computer, using TCPDUMP both on the foreign server
interface and on the eth1 of the NAT router, I see that packets reach
the external server with the right IP 192.114.84.144, I see that the
external server send back something, but I can't get it back on the
eth1 tcpdump.
Here is my iptables:
============
iptables -n -L -v
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source
destination
1664 208K ACCEPT all -- * *
0.0.0.0/0 0.0.0.0/0 state NEW,RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * *
0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo *
0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * *
0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
Chain FORWARD (policy ACCEPT 3499 packets, 213K bytes)
pkts bytes target prot opt in out
source destination
0 0 ACCEPT all -- eth0 eth1
10.0.0.151 192.114.84.144 state NEW,RELATED,ESTABLISHED
0 0 ACCEPT all -- eth1 eth0
192.114.84.144 10.0.0.151 state NEW,RELATED,ESTABLISHED
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source
destination
466 71467 ACCEPT all -- * *
0.0.0.0/0 0.0.0.0/0 state NEW,RELATED,ESTABLISHED
0 0 ACCEPT icmp -- * *
0.0.0.0/0 0.0.0.0/0
Here is my NAT table:
=============
iptables -n -t nat -L -v
Chain PREROUTING (policy ACCEPT 915 packets, 129K bytes)
pkts bytes target prot opt in out source
destination
0 0 DNAT tcp -- eth1 *
192.114.84.144 0.0.0.0/0 to:10.0.0.151
Chain POSTROUTING (policy ACCEPT 75 packets, 6372 bytes)
pkts bytes target prot opt in out source
destination
16 960 SNAT all -- * eth1
10.0.0.151 0.0.0.0/0 to:192.114.84.144
Chain OUTPUT (policy ACCEPT 36 packets, 3998 bytes)
pkts bytes target prot opt in out source
destination
I think I ACCEPT and FORWARD all, I have both SNAT and DNAT, but I
missed something.
Help will be welcome.
Patrick
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