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From Bob Cochran <>
Subject Re: [users@httpd] Expose my server to internet
Date Thu, 04 Jul 2019 18:11:29 GMT
On 7/4/19 1:45 PM, Padmahas Bn wrote:
> Hello Bob, Richar and Mark,
> Thank you for your response.
> *@**Bob Cochran*,
> Yeah, I can access port 80 form my local but not from internet. I'm 
> trying to access my IP from mobile network (Not wifi, from data pack) 
> Please find my comments below.
>     I'm not sure what you mean by "successfully logged in" into your
>     router.
> As I said, I've registered a free domain name on, I had to 
> configure dynamic DNS in my router to synchronize my external/public 
> IP (since it is dynamic in nature) with my registered domain name 
> automatically. So i meant that configuration was successful.
>     Your router will need to support NAT to translate your local IP
>     address
>     to the one on the Internet.
> I'm using TP-Link 300M Wireless N Router, Model No. TL-WR841N / 
> TL-WR841ND.
> I hope this supports NAT.

It sounds like you need to open a port on your router to forward port 80 
to your apache server.  Be careful about which ports you open and 
realize that once you do, others will discover it.  On the outside, you 
don't have to open 80.  It might be helpful to pick a high, obscure port 
number to avoid bots that scan ports searching for ways to gain entry 
into private networks.

>     sudo tcpdump -i enp2s0 -vvvSXn port 80
> I'm not sure which parameters I need to change here according to my 
> system. I just ran the same command and got output as
> tcpdump: enp2s0: No such device exists
> (SIOCGIFHWADDR: No such device)

enp2s0 is the name of my Ethernet  network interface.  I can discover it 
by running ifconfig.

It seems that you're somewhat new to networking.  I recommend that you 
install Wireshark on your Ubuntu machine and read some tutorials about it.

> *@Richard szajkowski*,
> It's my home network, and have dynamic IP address. But I've updated 
> the IP address which I got from google search "what is my ip",  while 
> forwarding the port.
> *@Mark J Bradakis,*
> Thank you for the reference. I'll take a look.
> Thank you.
> **
> On Thu, Jul 4, 2019 at 6:16 PM Mark J Bradakis < 
> <>> wrote:
>     Some of the tools here might assist in tracking down what is
>     visible to
>     the world and what is not.
>     mjb.
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