connect using (which) IP?

zapp_u · Post by **zapp_u** » Mon Dec 10, 2007 1:23 am

hello everyone
I want to be able to connect to my friends pc using just ips in the address bar. i dont want to use softwares. here is the scenario

http://img147.imageshack.us/img147/1989/basicwb2.png
Please take a look at this picture for u to be able to understand better.

I want to connect to pc 3 using pc 1 but the problem is that i can only get as far as modem/router 2 with external ip 202.164.100.101
how do i proceed. if a software can do it so it can be done otherwise also.
thnx

Post by **YeOldeStonecat** » Mon Dec 10, 2007 6:38 am

You'd need to find out what ports the remote software you're using requires to be open/forwarded, and then open/forward those ports to a static LAN IP of his PC. You would connect using the public IP.

There are some browser based ones that require no firewall reconfiguring or even knowing his WAN IP address, such as logmein.com...free.

Spazo · Post by **Spazo** » Mon Dec 10, 2007 1:36 pm

http://www.portforward.com good site for finding ports

zapp_u · Post by **zapp_u** » Mon Dec 10, 2007 4:38 pm

Thanks for the response.
hey buddy why would i require a software. Is there no other way to connect to the remote machine. i do not want to share or anything but just want to experiment. i could go as far as his router and i do not know how to ask the router to let me pass to the desired node or to know the nodes attached to the modem/router. May be i am wrong here but other data traffic like the websites requested,mail,etc also goes through to exactly the node that requested it. So why cant i find a way?

Spazo · Post by **Spazo** » Mon Dec 10, 2007 5:24 pm

It depends what you want to do on the remote machine. There are many ways to do anything, lots of stuff is already built into windows. If you really want to experiment you can get into linux and other platforms. But first to do anything you need to tell the router to allow you to talk to computers behind it. The router is built not to allow unauthorized data get through. It really comes down to this, If you have the money and don't have time get software for whatever your doing, but if its not a time critical thing and want to learn a little then search around and ask questions. If your looking at connecting to the remote computer like it was behind your router the easiest way (but not the most secure way) to do that is Microsoft VPN. Its built in and simple to setup.

zapp_u · Post by **zapp_u** » Fri Dec 14, 2007 2:19 pm

hi again
i searched about connecting to remote machine and it gets down to this question in my head. Is there a way to know the network structure inside a router. Can i know the nodes connected to the node and their IPs.
Like in the picture (http://img147.imageshack.us/img147/1989/basicwb2.png) is there any way to know that PC 3 (192.168.1.6) and PC4(192.168.1.2) are connected to router 2.
i found this in the following website : http://www.whatsmyip.org/ but under the "networking tools" option there is a "more info about me" text which gives my node(pc)[Internal Lan IP] IP ?. now thats what i need . How is that done? i mean it was allowed "inside" my router, how was the site able to get my NODE IP?
thankx

ErikD · Post by **ErikD** » Sat Dec 15, 2007 9:21 am

Doing a discovery on the other side of a remote router could be considered hacking. There are ways of doing it, but basically the whole reason for having the router and firwewall in place is to prevent this.

The reason you can discover your own easily is because you sent the request. All the software needs to do is ask the computer itself for its IP and it will get it, since you ran the software and initiated a communication between the two computers.

If you want to connect to a remote PC in your buddies network the best way is just have him setup port forwarding to it.

zapp_u · Post by **zapp_u** » Tue Dec 18, 2007 7:39 am

I thought the reason for having a router was to cope with the situation of having more machines than the available IP in IPv4, that is why the new version IPv6 is being developed.
And if we start looking at every thing as illegal (hacking), then there is no point of having this forum, don't u think?

So now if u could guide me to the right direction for the network discovery of the other side of a router,(without a software) i would be obliged.
Thanks

Post by **YeOldeStonecat** » Tue Dec 18, 2007 8:42 am

Not sure what you mean by network discovery of the outside?

Routers often usually run in a gateway mode, especially home routers. They share a single IP by utilizing NAT. 1x external IP is shared to computer..or an entire network..via NAT. You manage the inside of your network....either through the web admin of your router, or with another means such as a server, DHCP service, etc.

You can find out your external IP by many different means...sites like http://www.whatismyip.com, or even on our own site here at SG....have tools which will tell you your external IP address. Or...log into your routers web admin and look at the status section, specifically at the internet/WAN port...you'll see the IP right there.

Nothing to do with IP 4 or 6.

zapp_u · Post by **zapp_u** » Tue Dec 18, 2007 12:43 pm

No No, u misunderstood me. That was my reply for ErkD.
Anyways what i was asking for was a way to find out what all computers were connected to the other side of a router(of another network). Ya sure there are many softwares available that help u do it, but i want to find a way without using softwares!
Now is that too hard. So what.
thanks

Post by **YeOldeStonecat** » Tue Dec 18, 2007 1:09 pm

You want to sniff someone elses network without them knowing or allowing it? No, not here.

zapp_u · Post by **zapp_u** » Tue Dec 18, 2007 8:35 pm

Well ok if u take it that way, i wont ask now. As i said there are many softwares available, but i wanted to know how all this works!

thanks anyway, I have gained so much.

ErikD · Post by **ErikD** » Tue Dec 18, 2007 8:37 pm

The bottom line here is if you have a legitimate reason for connecting to a PC on another network then getting the proper information shouldn't be an issue. You setup a PC on your side and setup port forwarding so your friend can access it. Have your friend do the same, and you will be able to access each others PC on whatever protocol you setup (webserver, file server, etc.)

To be able to randomly connect to any PC on any network you feel like would be illegal. This forum is dedicated to preventing such acts, which can easily be used to harm others. I didn't mean to imply you would do anything wrong.

zapp_u · Post by **zapp_u** » Wed Dec 19, 2007 2:48 am

The thing is that i have tried port forwarding on my router and it is still unaccessible from outside. So i wanted to know what all is happening so i could understand it better. My ports are open, i have proper entries in the windows firewall but still for some reason i am invisible from outside. the services like
https://www.grc.com/x/ne.dll?bh0bkyd2
say that my pc is running in Stealth mode. None of the ports from 1 to 1000 are visible/accessible from outside! So i wanted to dig deeper into knowing the thing.
thanks