Remote Access Networking

Joeywells
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Cabling
DHCP
DNS
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Networking
Networking services
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I am not too good with networking, and I have a question. I need to be able to access two seperate computers at a remote location. There is DSL internet. Right now I just have one connected to the internet, and have everything forwarded to that specific IP address. The Remote Access program I use, Remote Administrator(Radmin), asks for an IP address to connect. I have always used cable modems, where there can be several Ip addresses run through a switch. Can There be several Ip addresses on a DSL modem, run through a switch? WHat do I need to do to be able to connect to both computers?
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Joey,

Whether or not you can do this depends a lot on the capbabilities of your DSL router. I assume you are using NAT on the router to translate internal IP addresses on your 2 computers to an external IP address that is assigned to the router. This would be the IP address that your ISP has assigned, either statically or via DHCP when the router is turned on. On some routers you can do port forwarding, where a connection coming in on a particular port is forwarded to a particular machine. For instance, you forward connections on port 110 to an email server, and connections on port 80 to a web server. In your case if the router will do port forwarding, forward different ports for remote access to each of your computers. Then assuming RAdmin (I haven’t used it so don’t know) will allow you to designate what port to connect to, you can use the port designation to connect to the computer you want to, while leaving the IP address the same.

Best – Doug

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  • Swiftd
    Joey, Can you answer some basic questions so that we know a bit more about your situation? What brand and model of DSL modem are you using? Do you have individual firewalls at each site behind the DSL modem? If so, what brand and model are they? Do any of your hosts have firewalls turned on? Without knowing those basics, no one will be able to positively give you an answer. Don
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  • KSRIMOUN
    Hello, I would first do a "ipconfig/ifconfig" depends on OS and verify that you are getting RFC1918 (private addresses) if so, then you can assume that the DSL equipment is doing as the others posted "NAT". Verify your IP address then go to http://DNSSTUFF.COM and verify at the top right bar of the site the IP address you verified what is posted as the IP address you are coming from to make sure it is not the same. Some Carriers does not do NAT.. depends on your carrier and your equipment. It may be bridged. With little information about your service this could be a possibility. If this is your case, then both machines have External IP. If this is the case, you may want to look at a Ethernet Router(DSL router) This is different from (DSL MODEM). One terminates ATM DSL signal for DSL service, while other one only does Ethernet routing. Some(DSL routers) does both. Best luck.
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  • bmarone
    You can't get specific step-by-step without specifics about your configuration, though it's not wise to divulge that info to the public anyway. Generally speaking, Radmin uses port 4899 but should be configurable. As mentioned, if you configure the 2nd machine to another port, say 4898, then you should be able to forward these ports individually at the router to the respective machines. Actually, Radmin's FAQ implies you can even leave all internal PCs using 4899, and just forward port 4898 at the router to port 4899 at the individual machines. http://www.famatech.com/support/faq.php#2_8 An alternative is to use Ultravnc (http://www.uvnc.com) and their vncrepeater software. You forward the vncrepeater port (5901 for example) at the router, and then use the vncviewer software to bounce thru the repeater and control the internal machines running vncserver. The advantage here is to use internal DNS names in the vncviewer software because the vncrepeater resolves internally. Yet another solution involves using SSH to port forward instead. This would be most secure, and most free, but it's more involved to configure. Your router/dslmodem may provide SSH or you can install sshwindows. Some connection examples http://martybugs.net/smoothwall/puttyvnc.cgi http://people.hmdc.harvard.edu/~mathpre/vnc/putty/ http://sshwindows.sourceforge.net/
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  • bmarone
    On an unrelated note, can anyone clue me in why some posts get duped? I thought it was me refreshing the page after I had posted, but I am *positive* I did that on another post today and it didn't dupe that one, and didn't do it on this one and it did dupe. Thanks.
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  • Shadyj
    More info on your config is needed to answer any questions about the multiple IP addys. As far as Radmin goes, you can set up a connection to your public IP and that will go to the box that you are forwarding the port to. After that, you can set up subsequent connections by computer name, or private IP, and then selecting "connect through host" and selecting the connection for the public IP.
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  • ID10twuzhere
    There is a pretty simple solution to this. Without having to get a out a schematic and teaching you how to build a flux copasitor.... on one machine, install VNC server. It communicates on port 5900, you say in post that you have everything forwarded to one machine to begin with... fine.. forward port 5900 to the machine with VNC and just forward port 3389 to the other and use your built in RDP client. If your using XP that is. very simple and saves you time.. you remote into both machines at the same time from one host.. as long as you have VNC viewer installed on your XP box. Plain and simple.
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  • CindyStiltner
    Very clear, well thought-out response Doug. Setting up <a href="http://www.proxynetworks.com">remote access</a> for the first time can be a bit confusing for individuals that are not technologically inclined, and it gets even more confusing when dealing with multiple IP addresses.
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