Re: how to access port forwarded server through internet ?

["Remzi AKYÜZ" <linuxliste@gmail.com>]

Bakshi;

input interface maybe invalid.
can you try this;

iptables -t nat -I PREROUTING -i wan_intarface  -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 wan_intarface -j ACCEPT

if this is failure, can you send  yours active iptables rules ? (iptables-save>  ipt_gw.txt )




On 03/16/2011 09:20 AM, J. Bakshi wrote:
> Any clue please ?
>
>
> On Tue, 15 Mar 2011 19:22:01 +0530
> "J. Bakshi"<joydeep@infoservices.in>  wrote:
>
>> Hello Remzi,
>>
>> Thanks for your kind response. Yes the forwarding is enable as I have it 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 AKYÃœZ<linuxliste@gmail.com>  wrote:
>>
>>> Hello,
>>> forwarding is enable?
>>> can you try this;
>>>
>>> #sysctl -w net.ipv4.ip_forward=1
>>> #iptables -A FORWARD -p tcp -m state --state NEW,ESTABLISHED --dport 81
>>> -i ${LAN_IFACE} -j ACCEPT
>>>
>>>
>>> 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 active 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 network 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 through internet. If I point at<domain-name>:81 throught internet ; the browser simply reports it can't connect to the service; though the other services running at that very server are quite accessible through internet. Have I missed something in my firewall rule ? Could anyone give any clue please ?
>>>>
>>>> Thanks
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