[HELP] forward ppp0 to eth1

[HELP] forward ppp0 to eth1

[Sandy Sumitro]

Dear All,

My current situation:

I have one computer:
- eth0 -> connected to and dial DSL modem (pppoe), no IP
- eth1 -> connected to LAN, IP: 192.168.1.251
- ppp0 -> up after dialup (dynamic IP)

I have another computer with IP: 192.168.1.252

What i want is:
- i want to redirect all request to ppp0 to eth1, which will forward
to another computer (192.168.1.252).

I am using these rules, but not working:

iptables -F INPUT
iptables -F OUTPUT
iptables -F FORWARD
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -t nat -F
iptables -t nat -A PREROUTING -i ppp0 -j DNAT --to-destination 192.168.1.252
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 192.168.1.252 -o ppp0 -j MASQUERADE

PS: i have set /proc/sys/net/ipv4/ip_forward to 1
(echo 1 > /proc/sys/net/ipv4/ip_forward)

Please help.
Best regards,
Sandy

Re: [HELP] forward ppp0 to eth1

[Gáspár Lajos]

Hi,

Sandy Sumitro írta:
> iptables -F INPUT
> iptables -F OUTPUT
> iptables -F FORWARD
> iptables -P INPUT ACCEPT
> iptables -P OUTPUT ACCEPT
> iptables -P FORWARD ACCEPT
> iptables -t nat -F
> iptables -t nat -A PREROUTING -i ppp0 -j DNAT --to-destination 192.168.1.252
> iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
> iptables -t nat -A POSTROUTING -s 192.168.1.252 -o ppp0 -j MASQUERADE
>
>   
Seems good... Except the last rule is not going to get hit by any 
packet... :D

> PS: i have set /proc/sys/net/ipv4/ip_forward to 1
> (echo 1 > /proc/sys/net/ipv4/ip_forward)
>
>   
Good... :D

1. Check the default gateway setting on the DMZ (1.252)
2. Check the routing on gateway (1.251)
3. Setup a firewall on DMZ too !!!

Swifty