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rahul_mawana's Avatar, Join Date: Apr 2009
Contributor
Nothing wo'nt happen,
beco'z firewall is not blocking the connection.
The matter is this that router has a runing telnet service on port 23,
and if i make connection using public ip on port 23 then i am connected to router telnet service,instead of that computer whose ip i m trying to connect.
So i think there is not any roll of firewall.
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SpOonWiZaRd's Avatar, Join Date: May 2007
Know what you can do.
Does the computer you are trying to access have remote desktop activated? If it does then set the router to forward port 3389 to the internal IP of the computer. make a normal RDP (Remote Desktop Protocol) connection to the external IP of the router, the router will then see that a connection to that port has been made and then it will pass the connection on to the internal IP you have specified on the router.
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rahul_mawana's Avatar, Join Date: Apr 2009
Contributor
but internal IP is changed every time when internet connection is established. so i think i will have to do setting every time on his router.
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SpOonWiZaRd's Avatar, Join Date: May 2007
Know what you can do.
If the internal IP changes then it means he has DHCP (Dynamic Host Configuration Protocol) enabled on the router and thus the IP of his machine will change everytime the computer connects to the router. ADSL uses dynamic IP aswell for the external IP, to overcome this problem of keeping track with the router's external IP you must configure DDNS (Dynamic Domain Naming Service) on the router. DDNS is when you link the router's IP address to a domain name that you create for free at http://www.dyndns.org e.g: the domain name that you create is router.office-on-the.net and then after you have configured the router's DDNS the domain name's IP address will be updated on a timely basis according to the external IP. To overcome the problem of the internal DHCP you will see that most routers have a ARP (Address Resolution Protocol) table on them that shows the IP address's of all the host's connected to them. All you do then is to configure the router to pass any traffic it recieves on port 3389 (That is RDP (Remote Desktop Protocol)) to the desired internal IP you want. Open RDP Connector on your computer, type in the DDNS domain name you registered and configured the router to use in the RDP Connection field, and click on connect. The router which you configured to use DDNS will see the RDP incoming connection on port 3389 and then it will pass the traffic to the internal IP you selected. Now you have a RDP connection to the internal IP on the other network. I think the firewall may block it on the other computer or the antivirus as it is an external connection. You can configure the router to forward many other ports this way like SMB (Server MEssage Block) port 445 to the internal IP or telnet on port 23, ftp on port 21 an so on.
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rahul_mawana's Avatar, Join Date: Apr 2009
Contributor
This is perfect solution spoonwizard, u r master,i try it and report u soon THANK U very much.
One more thing i want to learn all networking terms, can u provide me some weblink for networking topics.
Thanks again
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SpOonWiZaRd's Avatar, Join Date: May 2007
Know what you can do.
No problem, if you do it right it will work.