modem iptables

[Florentin Ionescu <florentin_ionescu@yahoo.com>]

Hi,
 I am trying to connect my box , as dhcp server for my laptop and have
 problem using iptables to give internet access for the laptop. The box
 has a modem -> connects to internet , and a NIC connected to a hub to
 which laptop is also connected.

 Internal network works(ping , dhcp assigns address), kernel is 2.4.18,
 all necessary  modules form ipv4 are loaded , and in /proc/sys/net/ipv4
 ip_forwad and ip_dynaddr are set to "1".


So box is 192.168.0.1 (configured in /etc/network/interfaces) with this
netstat -nr
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
165.238.140.22  0.0.0.0         255.255.255.255 UH       40 0          0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U        40 0          0 eth0
0.0.0.0         165.238.140.22  0.0.0.0         UG       40 0          0 ppp0

Laptop  does get it's IP from dhcp server 198.162.0.2 plus
I add 'route add -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.0.1'
netstat -nr (laptop) -
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.0.0     0.0.0.0         255.255.255.0   U        40 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U        40 0          0 lo


The problem where I need some help is that I get packets in/out but
no packet gets forwarded eth0 to ppp0 or ppp0 to eth0  -

iptables -A FORWARD -i eth0 -o ppp0 -j ACCEPT
iptables -A FORWARD -s 192.168.0.0/24 -j ACCEPT
iptables -A FORWARD -d 192.168.0.0/24 -j ACCEPT
iptables -A PREROUTING -t nat -p tcp -i ppp0  -j DNAT --to 192.168.0.1


Thank you,
 Florentin.







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