Iptables - Redirecting packet to different IP

Hi

I am trying to redirect port 5100 to differnet Pc on my network.
I created those rules but it is not working.

Please check.

/sbin/modprobe iptable_nat

/sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

echo 1 > /proc/sys/net/ipv4/ip_forward

/sbin/iptables -N block
/sbin/iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A block -m state --state NEW -i ! ppp0 -j ACCEPT
/sbin/iptables -A block -j DROP
/sbin/iptables -A INPUT -i ppp0 -p tcp --destination-port 5100 -j
ACCEPT


/sbin/iptables -A INPUT -j block
/sbin/iptables -A FORWARD -j block


/sbin/iptables -t nat -A PREROUTING -i ppp0 -p tcp --destination-port
5100 -j DNAT --to-destination 192.168.0.103:5100

I want to be able to forward port 5100 to 192.168.0.103 on my network.

Thanks

Bartosz Wegrzyn <(E-Mail Removed)> wrote:


> I am trying to redirect port 5100 to differnet Pc on my network.
> I created those rules but it is not working.
>
> Please check.
>
> /sbin/modprobe iptable_nat
>
> /sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
>
> echo 1 > /proc/sys/net/ipv4/ip_forward
>
> /sbin/iptables -N block
> /sbin/iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
> /sbin/iptables -A block -m state --state NEW -i ! ppp0 -j ACCEPT
> /sbin/iptables -A block -j DROP

/sbin/iptables -A FORWARD -i ppp0 -p tcp --destination-port 5100 -j ACCEPT

> /sbin/iptables -A INPUT -j block
> /sbin/iptables -A FORWARD -j block
>
>
> /sbin/iptables -t nat -A PREROUTING -i ppp0 -p tcp --destination-port
> 5100 -j DNAT --to-destination 192.168.0.103:5100


Ciao, Horst
--
»When pings go wrong (It hurts me too)« E.Clapton/E.James/P.Tscharn

Thanks for the advice.
I will check. And In thing you are right that I should apply it to
Forward chain instead of Input.

Thank You

Horst Knobloch <(E-Mail Removed)> wrote in message news:<btsf3m$1lkk$(E-Mail Removed)>...
> Bartosz Wegrzyn <(E-Mail Removed)> wrote:
>
>
> > I am trying to redirect port 5100 to differnet Pc on my network.
> > I created those rules but it is not working.
> >
> > Please check.
> >
> > /sbin/modprobe iptable_nat
> >
> > /sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
> >
> > echo 1 > /proc/sys/net/ipv4/ip_forward
> >
> > /sbin/iptables -N block
> > /sbin/iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
> > /sbin/iptables -A block -m state --state NEW -i ! ppp0 -j ACCEPT
> > /sbin/iptables -A block -j DROP
>
> /sbin/iptables -A FORWARD -i ppp0 -p tcp --destination-port 5100 -j ACCEPT
>
> > /sbin/iptables -A INPUT -j block
> > /sbin/iptables -A FORWARD -j block
> >
> >
> > /sbin/iptables -t nat -A PREROUTING -i ppp0 -p tcp --destination-port
> > 5100 -j DNAT --to-destination 192.168.0.103:5100
>
>
> Ciao, Horst