Very Computer

Hi,

I have setup Linux (with 2 NICs) as a router, my eth1 use the Virtual IP
192.168.1.1
and the other eth0 get its IP by connecting to the Internet through PPPOE.

I have setup firewall using iptables, allowing ports like  21,80 connection
from outside.
FTP works perfect from outside, inside or the Linux itself.

I have also setup a web server on the Linux. I can access it by IP address
(e.g. http://203.123.1.1)
(using the IP assigned by ISP through DHCP/PPPOE) by using a browser
on my internal LAN or on my Linux.
However, it cannot be accessed from other clients on the Internet.
Do anyone have any ideas why?

N.B. outside can ping or FTP to my Linux, but web access fail.
I haveever disbled the firewall but my web server still could not be
accessed from outside.

Simon

...

Quote:> (using the IP assigned by ISP through DHCP/PPPOE) by using a browser
> on my internal LAN or on my Linux.
> However, it cannot be accessed from other clients on the Internet.
> Do anyone have any ideas why?

> N.B. outside can ping or FTP to my Linux, but web access fail.
> I haveever disbled the firewall but my web server still could not be
> accessed from outside.

run a tcpdump -n -i ppp0
and try and connect to the web server from outside.  For it to work
to should see packets appearing in the tcpdump output. The IPs
involved will be the outside IP your connecting from and the IP of
the box.

I suspect your provider maybe blocking port 80 access to your
system, if that is the case then no packets will appear in tcpdump
and you will have to contact the provider and tell them your not
running IIS (ie the reason why it is blocked).

karl.

Karl,

You are completely correct!  My ISP blocked port 80.
I have tried tcpdump and found nothing of port 80 getting in from outside,
later I change the web server port to some non-standard port,
then access my web server from other client  from the Internet , it worked!

Thanks a lot.

Simon