Here is the scenario:
I have asked my ISP to give me public IP, which I can connect to my laptop and access from other outside network. They gave me following
IP : 103.51.2.198
subnet mask : 255.255.255.248
default Gateway : 103.51.2.193
preferred dns : 8.8.8.8
Alternate dns : 8.8.4.4
I have connected PPPoE connection in my laptop (not in router) and set these values at TCP/IP V4. My internet connection is fine.
But If I ping from other network by this IP (103.51.2.198), request is timed out.
Than I checked whatsmyrealip. and the IP is (103.51.2.102). this IP is a public IP of my ISP provider. And they are trying to give me an IP from that IP.
My ISP providers are not expert in networking nor am I. They are also not sure how they can give me a public IP.
I am not sure about what are they trying to do. and how will they give me another IP from a public IP. It will be very helpful, If anyone can explain the problem. and give a solution.
First of all, it's called public IP not "realIP".
Anyways, the answer for your question is:
You cannot access your home computer because it is behind NAT so it is unreachable from the outside of your network.
Quick example on how NAT works:
Scenario:
Private IP: 192.168.0.10
Public IP: 1.2.3.4
You are connecting to webserver on IP: 5.5.5.5
What happens:
You send data to your router, telling it that you want something from
5.5.5.5, your router assigns you a random port, let's say 11111,
sends the data with source IP 1.2.3.4 and port 11111. Stuff
happens on the webserver and the data comes back. Router reads it and
remembers that everything going to 1.2.3.4:11111 belongs to
192.168.0.10 so it sends you the data.
Here everything works because it's your computer the one starting the connection, otherwise, the webserver would never be able to connect to you.
Related
I'm able to open the website being served on port 4568 on 127.0.0.1 (localhost) and my private ip address, but I can't seem to do so on my public ip address. I've tried to access the website by typing :4568 after my public ip like I did for my localhost and private ip.
Is it possible to open a site running locally on my computer through my public IP? If so, how? If not, why not?
NOTE: I'm not exactly clear what tags are appropriate. Feel free to add or remove any you deem inappropriate.
You are likly behind a NAT. What this means is that your public IP address and private IP address are not necessarily mapped to each other fully. To explicitly map your application to your public address, try the following:
Go to your modems management page
Look for a 'Port Forwarding' tab (might be under an advanced or
router menu)
There will probably be two or three field to enter:
The port on the public ip address to forward traffic from
The IP address to forward traffic to (your private IP)
(might be there) The port to send it to on the private IP
Assuming this works, all traffic going to your public IP address on that port will now go to your private IP address.
WARNING This is a simple rule and everyone on the internet can now access that port
Also make sure your web server is listening on 0.0.0.0 (all IP addresses) and your local firewall is allowing remote connections on the port in question.
I have a machine in my private network with IP 192.168.1.10
I have a DNS name, "toto.mydns.com", a DNS client is running on the machine.
I configured the router for Port forwarding.
I can access the machine when i am outside my home, when using a pulic IP address it works but when i am at home and i get a dynamic IP address trough DHCP from my router, i cannot use toto.mydns.com anymore, i must use 192.168.1.10 to access.
I would like to know if i need to configure something on the router for that ?
Thank you !
toto.mydns.com will resolve to your external public IP
There will almost certainly be nothing routing that IP through to your router, and thus through NAT to your internal address.
The easiest way to resolve this (Pun very much intended) is to have a hosts file entry on your computers running inside your network so that they resolve the same DNS address to the internal address.
A much harder, but more fun, way would be to set up your own DNS server inside your network, have the DHCP dish it out as the primary DNS server for your network and put in an entry for your internal address :D
Have fun...
Toto.mydns.com is accessible from outside,this DNS is assigned on a machine with a static IP address(sorry not dynamic),so the IP of this machine is 192.168.1.10.
Whrn i am at home in my private network i need to enter 192.168.1.10 and toto.mydns.com does not work.Any help???
I've some doubts about a VPN.
I've been given a Cisco VPN client to connect to the LAN of my society. I use this to connect to a local server. I don't understand how the VPN is working.
I'm at home now. In the VPN Client I see an IP. If I go to http://www.whatismyip.com/ I see another IP, which is the IP I've when I'm also without the VPN Client, while I expected to see the IP of the VPN Client. If I use $_SERVER['REMOTE_ADDR'] I see another (third!) IP, while I expected the IP I see in the VPN Client.
Can you clarify please?
I need this to know if I'm identifies always from the same IP from the local server.
If I'm not mistaken, this should be correct. Please correct me if I'm wrong.
By default you have 2 IP addresses.
Local IP: IP address used to identify yourself within your LAN.
Global IP: A public IP used to gain access to the internet. At home it will most likley be a public IP NATTED* by your ISP.
Because you're also using a VPN connection, you'll receive a third IP.
Local IP for VPN: IP address used to identify yourself on the other end of the VPN.
*NAT = Network Address Translation
Suppose that I am sharing a public ip 56.162.XXX.XXX with some other users. Now I have a local ip that I see if I type ipconfig in the command prompt. That is 192.168.2.3. Now I have a program running on port 3630 listening to any incoming connection. I can call myself with the help of loop back ip ie. telnet 127.0.0.1 3630, and i see that two programs are getting connected and can exchange data. I can also telnet and get connected with my laptop from another laptop which is sharing same public ip as mine by the command telnet 192.168.4.20 3630. But how should I do the same from a remote computer? I mean a computer which has a different public ip.
Actually I want something like "telnet public ip(local ip) port no". The other computer is also sharing a public ip with some other users.
You will need to setup some kind of NAT (Network Address Translation) or PAT (Port Address Translation) that will forward the requests for port 3630 to your local IP.
The actual configuration to use will depend on your firewall/router. If you have a standard ADSL router, there is likely to be a configuration page in there that will allow you to do this.
You will need to read up on port forwarding and NAT.
http://en.wikipedia.org/w/index.php?title=Port_forwarding
Ignoring other possiblities such as Request.ServerVariables["HTTP_X_FORWARDED_FOR"], does Request.ServerVariables["REMOTE_ADDR"] gives me the "principal" IP of the client?
I'm talking about the IP that made the actual TCP connection.
Will ServerVariables["REMOTE_ADDR"] always be the "real" IP address of the remote endpoint?
Just to clarify: Even if it's a proxy who made the real TCP connection I'd like have its IP, and not a forwarded one.
Yes, except if its been through a NAT firewall. A NAT firewalled address would be masquerading many 192.168.x.x or any other private subnet behind a public IP address. So you'd be looking at the IP address of the NAT firewall (i.e. a Linksys Router or what have you).
Be warned that many cell phone carriers have HUGE NAT networks so they always look like they are coming from one or two public IP addresses.
The REMOTE_ADDR variable will be the IP of the system that directly connected to your web server to request the URL; so it would be the forward-most proxy server, if there is a proxy server.