From mboxrd@z Thu Jan  1 00:00:00 1970
From: "J. Bakshi" <joydeep@infoservices.in>
Subject: Re: how to access port forwarded server through internet ?
Date: Tue, 15 Mar 2011 19:22:01 +0530
Message-ID: <20110315192201.7b139b3f@debian>
References: <20110315175928.4dbbe83c@debian>
	<4D7F66A2.1080804@gmail.com>
Mime-Version: 1.0
Content-Transfer-Encoding: QUOTED-PRINTABLE
Return-path: <netfilter-owner@vger.kernel.org>
In-Reply-To: <4D7F66A2.1080804@gmail.com>
Sender: netfilter-owner@vger.kernel.org
List-ID: <netfilter.vger.kernel.org>
Content-Type: text/plain; charset="windows-1252"
To: Remzi =?UTF-8?B?QUtZw5xa?= <linuxliste@gmail.com>
Cc: netfilter@vger.kernel.org

Hello Remzi,

Thanks for your kind response. Yes the forwarding is enable as I have i=
t in my script

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

But no luck :-( here is the modified rule

iptables -A INPUT -p tcp -m tcp --dport 81 -j ACCEPT
iptables -A PREROUTING -t nat -i ${LAN_IFACE} -p tcp --dport 81 -j DNAT=
 --to 192.168.1.2:8080
iptables -A FORWARD -p tcp -m state --state NEW,ESTABLISHED --dport 81 =
-i ${LAN_IFACE} -j ACCEPT


On Tue, 15 Mar 2011 15:16:18 +0200
Remzi AKY=C3=9CZ <linuxliste@gmail.com> wrote:

> Hello,
> forwarding is enable?
> can you try this;
>=20
> #sysctl -w net.ipv4.ip_forward=3D1
> #iptables -A FORWARD -p tcp -m state --state NEW,ESTABLISHED --dport =
81=20
> -i ${LAN_IFACE} -j ACCEPT
>=20
>=20
> On 03/15/2011 02:29 PM, J. Bakshi wrote:
> > Dear list,
> >
> > Here is a port forwarding issue.  I have a linux router which have =
two NIC; one facing WAN and the other facing LAN. IP forwarding is acti=
ve and this box is working as a gateway. This box has LAN IP 192.168.1.=
1
> >
> > There is another box (webserver) 192.168.1.2 within the internal ne=
twork and the router box has port forwarding to access the webserver.
> >
> > ```````````````````````````
> > iptables -A INPUT -p tcp -m tcp --dport 81 -j ACCEPT
> > iptables -A PREROUTING -t nat -i ${LAN_IFACE} -p tcp --dport 81 -j =
DNAT --to 192.168.1.2:8080
> > iptables -A FORWARD -p tcp -m state --state NEW --dport 81 -i ${LAN=
_IFACE} -j ACCEPT
> > ````````````````````````````
> >
> > So within LAN I can access the 192.168.1.2 web server through  192.=
168.1.1:81 as port forwarding is there. But I can not access the same t=
hrough internet. If I point at<domain-name>:81 throught internet ; the =
browser simply reports it can't connect to the service; though the othe=
r services running at that very server are quite accessible through int=
ernet. Have I missed something in my firewall rule ? Could anyone give =
any clue please ?
> >
> > Thanks
> > --
> > To unsubscribe from this list: send the line "unsubscribe netfilter=
" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>=20