I'm sure my ISP does not blocked any ports. A external user can go to http://203.162.4.1 to access my Apache WebServer. If I change port of WebServer 203.162.4.1 to 81, URL "http://203.162.4.1:81"; works well.
Thach! Lisa Ryan wrote:
>check that the ISP doesn't have port 80 blocked. Some ISP's block ports
>under 1024 & you need to request to have the port opened.
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] Behalf Of Le Ngoc Thach
>Sent: Wednesday, June 11, 2003 10:50 AM
>To: [EMAIL PROTECTED]
>Subject: How configure Iptable in RedHat 8.0
>
>
>Hi,
>I'm using iptables-1.2.6a-2 in RedHat 8.0 router, gateway and firewall.
>I can not configure to implement the case:
>Ex:
>- External IP of gateway is 203.162.4.1, this host is also listening at
>port 80 (Apache WebServer) and portal 8080 (Tomcat).
>- Internal IP of gateway is 192.168.2.1
>- An other internal host is 192.168.2.2, this host is listening at port
>80 (IIS WebServer).
>
>I want a user can go to http://203.162.4.1:81 to access the internal
>host 192.168.2.2 that IIS is running.
>I have tried to use "PREROUTING" such as
>
>/sbin/iptables -A PREROUTING -t nat -d 203.162.4.1 -p tcp --dport 81 -j
>DNAT --to 192.168.2.2:80
>
>(View my configuration iptable in attachment).
>
>but url "http://203.162.4.1:81"; does not work. If I try "REROUTING" to
>192.168.2.1 such as:
>/sbin/iptables -A PREROUTING -t nat -d 203.162.4.1 -p tcp --dport 81 -j
>DNAT --to 192.168.2.1:8080
>
>It's OK. Then, http://203.162.4.1:81 is TomCat HomePage.
>
>What is woring? Please help me!
>
>Thanks!
>
>
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