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**thuor** · 07-26-2007, 09:55 AM

VNC for remote camera monitoring

To understand this we need to understand how your network is architectured. I think i have a pretty good idea what's going on.

1. What error do you get. Do you get a "Connection Refused" or "Connection Timeout". My bet is on the latter?

2. What do you use to get to the internet? I.e Do you have cable/dsl/T1 etc?

3. Are you cascading/ daisy-chaining multiple routers? Note that many DSL "modems" are actually routers as well. E.g we sell the Actiontec DSL modem with QWEST service but this is really a router and since it only has one LAN port most people usually connect another router to it and use that 2nd routers 4 port switch to connect their computers instead of using a switch after the Actiontec router/modem.

4. Do you have any software firewall on the PC you are trying to access and if so have you opened the VNC port (5900 or 5800 depending on what your forwarding)?

**distr12it** · 07-26-2007, 10:08 AM

I'm getting "failed to connect: connection timed out (10060)"

I have a DSL modem router and a D-Link DI624 4 port router connected to
the output of the DSL modem. I kinda suspected this was a problem so i tried different things:
i) i tried to forward 5900 to my PC at both the DSL router and teh DI624 router. E.g if my PC is at 10.6.6.8 (then in set TCP forward to 10.6.6.8 at both my Actiontec router and my D-Link router)
ii) i tried to forward from the DSL router to the D-Link router and from the D-Link router to the pc. The D-Link router is at 192.168.0.2 so in the DSL modem i forward 5900 to 192.168.0.2 and in the D-Link router i forward 5900 to 10.6.6.8
None work.

Yes im cascading the routers.

Firewall is turned off. had to do this to get it to work in the local setup i.e when i was trying to connect to 10.6.6.8 form a computer in 10.6.6.x network.

**thuor** · 07-26-2007, 10:24 AM

The "failed to connect: connection timed out (10060)" error is a windows socke error (Winsock) which means a connection attempt failed because the connected party did not properly respond after a period of time. Of you haven't already done so do a ping to that target ip address just to make sure you have network connectivitity to the host computer. In any case this is most likely not the problem - the most likely problem has to do with trying to port forward accross multiple routers. We have seen this to work very very rarely.

What you need to do is dump the D-Link router and just get a D-Link switch (these are really cheap we have a 5 port switch, 1 input 4 outputs for $39 here: http://www.rfwel.com/shop/catalog/Linksys-5-port-10-100-Switch-p-695.html. This way you only have one level of NAT (network address transversal) and the port forwarding will work fine.

As an aside remember the only time you need multiple routers in your network is to isolate collision domains. Said simply is when your network is so large (many computers) that you need to separate domains to minimize collisions. Recall that ethernet uses CSMA/CD (Carrier sense multiple access with collision detection) for multi-access control. When one or more PC's on the network start to transmit at the same time they collide (this is expected). When they collide they try again to retransmit but after a random delay called the backoff period. As you start adding PC's to your networks these collisions become more and the backoff time becomes more which manifests itself as a drop in throughput or speed of your network. In this case adding another router helps. So if you dont have many computers then a single router is fine and to connect multiple computers to this single router if you only have one output port you need a switch.

Let us know how your setup goes after you make this change and your video quality through VNC as well as what DVR you are using for your remote camera.

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Using VNC to Monitor Remote Cameras

Using VNC to Monitor Remote Cameras

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