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3160 posts

Uber Geek
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Topic # 74852 8-Jan-2011 23:52
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I've had a network setup at my home now that has worked (for the most part) for the last two years. Basically, I have a desktop machine, which is where all my files are stored, and I can access it remotely from any computer connected over the network, either wired or wirelessly. The desktop is connected to my RTA1025W by ethernet cable, all other machines connect to it via wireless.

I've had port forwarding setup, allowing me to connect to the desktop remotely via TightVNC, thereby allowing me to control it from elsewhere. To do this, I assigned each machine on the network an internal IP address, and the port forwarding has worked fine. Only issue is when the laptops are taken elsewhere, they have issues connecting wirelessly, as they are always trying to get the LAN specified in the network settings in Windows.

I mentioned this issue to a colleague last week, who suggested instead of modifying the network settings on each machine, I set it up so that the MAC address is assigned the internal IP instead. I did this and bingo, it all works really well.

Only issue is tonight, when I try to connect to my desktop using TightVNC as I have done previously (and has been fine for over two years) now it refuses to connect. Apart from entering in the IP address/MAC address for each machine on my network, I didn't change any port forwarding rules. I deleted them and left the space empty, but that didn't work either. I'm sure it has to do with specifying the internal IP in the router instead of on the machine, but is there some way I can set up the router to allow a connection remotely using TightVNC?

Sorry for the novel, it's a pretty complex situation and I thought I should explain it all. If I've missed anything out or something doesn't make sense please say so.

Any assistance gratefully accepted.

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3160 posts

Uber Geek
+1 received by user: 595

  Reply # 425346 9-Jan-2011 00:01
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Forgot to add:

* I'm using no-ip and forwarding to internal IP
* This doesn't work externally from the network either (I just tested it from another connection)
* I have been to and downloaded the tool and it says port 5800 is not open

My port forwarding rules look like this:

Application Name External Packet Internal Host
IP Address Protocol Port IP Address Port

Network ALL TCP 5800 5800

I've also turned off ZoneAlarm to see if this would make any difference (this had been configured previously and had been working with the setup too) but it didn't change anything.

If worst comes to worst, I can re-enter the IP addresses individually onto each machine again...but I'd prefer not to, if I can help it.

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Master Geek
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  Reply # 425349 9-Jan-2011 00:15
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Im not really familiar with that modem, but can it do Address Reservation and assign static ips over dhcp?  That would be a more elegant solution, or is that what you just described with manually entering ips and mac addresses?

Other thing to check is that Isp is not blocking those ports.  You should at least see the port is open when doing a port scan, try (shields up) and do a scan from inside your network.

If you are getting port is stealth, then it is not making it through your router.

If you are getting port is closed then its getting forwarded from your router but the service may not be running on the destination machine.

edit :  windows firewall off too?


3160 posts

Uber Geek
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  Reply # 425351 9-Jan-2011 00:31
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Yes, it appears it can. The router has a "Reserved IP Address List", which is where I entered all the MAC addresses and assigned the IP's accordingly - and since then is where I've come unstuck.

It won't be the ISP or firewall settings, as both of those things were not changed, and this all worked perfectly before I entered in the IP addresses directly on the router, as opposed to doing it manually on each machine :(

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Master Geek
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  Reply # 425352 9-Jan-2011 00:34
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Have you tried rebooting the router?

And are all machines set to get ip address automatically from dhcp.

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Uber Geek
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  Reply # 425353 9-Jan-2011 00:39
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Yes, done that a few times, and no, the machines have their IP addresses specified in the router, otherwise I can't access the desktop machine remotely - using no-ip it forwards to my external IP (I don't have a static) and from there it forwards to the machine on the network, which means it needs the same internal IP.

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Master Geek
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  Reply # 425355 9-Jan-2011 00:46
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I have a similar setup, with dyndns, except router assigns pc fixed address over dhcp.
I think you might be having connectivity issues, can you connect to your desktop from inside your network.

Also the reserved IPs need to be in the range of the Start and End IP on router.

3160 posts

Uber Geek
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  Reply # 425356 9-Jan-2011 00:48
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Yes that works fine.

I think I fixed the problem by simply specifying the IP address the desktop should have in Network settings on the Control Panel, on that machine only - all the others still get their information from the router. Seems to be working fine now.

Thanks for your help anyway :)

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