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Forum Discussion
Solved
Port Forwarding
Using the R6400v2, and I'm trying to forward a port to an IP camera. No matter which port I choose, it doesn't show open when I try an Open Port Checker. Any thoughts on where to start troubelshooting?
> Actual port-forwarding rule?
> TCP Port 58787 Pointed at the internal IP of the cameraWhich part of "Actual" was unclear? There's no good reason to hide
your private LAN IP addresses, and the port-forwarding target also
includes a port number.> Via a web browser [...]
So, presumably ("http://"), your port-forwarding rule must specify
internal port 80. Does it?> I haven't assigned a static IP at this point, but I it's a small
> homenetwork, so unless something radical changes, [...]Like a power interruption anywhere? A static address is configured
on the device itself. You'd probably be happier with a reserved dynamic
address for the camera, configured on the router (DHCP server):
ADVANCED > Setup > LAN Setup : Address Reservation.
> I am not using NAT. [...]Of course you are. Your camera IP address (currently "192.168.1.7"?)
differs from your external IP address. NAT is what makes that work (if
it ever does).> I was worried this might be an issue. I don't know how to get the
> RMTP for the camera.You don't need that. What you do need is a port-forwarding rule
which specifies the Internal (LAN) port number used by the camera,apparently 80.
> [...] From a system on your LAN, using the
> router's WAN/Internet IP address:external_port?> I can get to it from my side of the router via either my PC or my
> cellphone. [...]
Using the router's WAN/Internet IP address:external_port? Not with
that port-forwarding rule.If a normal web browser on a system on your LAN works with a simple
URL (like, say, "http://192.168.1.7"), then the camera must be listening
at port 80, and your port-forwarding rule must specify internal port 80.The external port number is your choice, but if it's not 80 (and it
probably shouldn't be), then you'd need to specify it in any URL which
includes your external IP address. For example:Part of the Translation in NAT is from the external (WAN) IP address
to the internal (LAN) IP address. Another part is from the external
(WAN) port number to the internal (LAN) port number.
3 Replies
> Using the R6400v2, [...]
Firmware version? Connected to what?
> [...] and I'm trying to forward a port [...]
Actual port-forwarding rule?
> [...] to an IP camera. [...]
Not a very detailed description of anything. Connected how, exactly?
Can you access this "an IP camera" from a system on your LAN? How,
exactly? What's the IP address of this "an IP camera"? How have you
ensured that it doesn't wander?> [...] No matter which port I choose, [...]
Did you try all 64K ports? What, exactly, did you try?
> [...] it doesn't show open when I try an Open Port Checker.
Which? How?> [...] Any thoughts on where to start troubelshooting?
Other than a better description of your stuff, how it's connected,
what you did, and what happened when you did it?The usual problems with this stuff are:
1. Wrong external IP address (different from the port-forwarding
router's WAN/Internet IP address). (An intermediate NAT router, for
example, could cause this.)What is the WAN/Internet IP address of your R6400v2? If you're
worried about revealing your public IP address, then report at least the
first two octets ("a.b" out of "a.b.c.d") for any worrisome IP Address.2. Bad port-forwarding rule (wrong port(s), wrong target address --
including a wandering target).
What is your actual port-forwarding rule? Copy+paste is your friend.3. Server not listening on the port-forwarding target system.
Can you access this "an IP camera" from a system on your LAN, using
the camera's LAN IP address:port? From a system on your LAN, using the
router's WAN/Internet IP address:external_port?4. External influences: ISP blocking, other firewalls, ...
Your forum search for "port forwarding" found none of this?
Firmware version? Connected to what?
V1.0.2.44_1.0.35 - A Netgear CM400 Switch
Actual port-forwarding rule?
TCP Port 58787 Pointed at the internal IP of the camera
Connected how, exactly?
Wirelessly through the router.
Can you access this "an IP camera" from a system on your LAN?Yes.
How, exactly?
Via a web browser pointed to the IP plus the internal web page of the camera. "IP/img/snapshot.cgi?size=3" Forces the camera to send back a still of whatever it's looking at, which happens to be my 3d printer in the basement.
What's the IP address of this "an IP camera"?
192.168.1.7
How have you ensured that it doesn't wander?
I haven't assigned a static IP at this point, but I it's a small homenetwork, so unless something radical changes, it's unlikely to change, especially since I leave it hot all the time. Since I have to enter the IP to test it, and it never fails, I suppose it's not a huge issue at this moment.
Did you try all 64K ports? What, exactly, did you try?
80
8080
3333
8787
58787
Which? How?
None of the port numbers above. How am I trying it? I navigate to http://www.portchecktool.com/. The website successfully auto-detects my external IP. I enter the port I tried forwarding, and it reports that it couldn't reach the port.
The usual problems with this stuff are:
1. Wrong external IP address (different from the port-forwarding
router's WAN/Internet IP address). (An intermediate NAT router, for
example, could cause this.)I am not using NAT. All the typical resources to see my external IP report the same value. My ISP rarely changes my external IP. But for the purose of this, I did setup the free No-IP DDNS through the Netgear router. I got my own "free" DDNS, and I've downloaded the DUC, set it up, and run it as a service with a 1 hour update.
What is the WAN/Internet IP address of your R6400v2? If you're
worried about revealing your public IP address, then report at least the
first two octets ("a.b" out of "a.b.c.d") for any worrisome IP Address.174.85.16.225
2. Bad port-forwarding rule (wrong port(s), wrong target address --
including a wandering target).What is your actual port-forwarding rule? Copy+paste is your friend.
# Service Name External Start Port Internal Start Port Internal IP address 1 3DPC 58787 58787 192.168.1.7 3. Server not listening on the port-forwarding target system.
I was worried this might be an issue. I don't know how to get the RMTP for the camera.
Can you access this "an IP camera" from a system on your LAN, using
the camera's LAN IP address:port? From a system on your LAN, using the
router's WAN/Internet IP address:external_port?I can get to it from my side of the router via either my PC or my cellphone. If I turn off my cell's wifi connection and attempt to go through the DDNS, no dice.
4. External influences: ISP blocking, other firewalls, ...
I don't think my ISP does any blocking. I opened the same port numbers in my Windows Firewall just to be sure
Your forum search for "port forwarding" found none of this?
It found nothing I didn't already try or that seemed to be specifically relevant. Maybe you'll say, but sure you can get to that IP addy from a browser every single time, but there's magical nonsense that sometimes not reserving that IP can allow you to get to it through a browser, but not from an external DDNS. Is that a thing maybe?
> Actual port-forwarding rule?
> TCP Port 58787 Pointed at the internal IP of the cameraWhich part of "Actual" was unclear? There's no good reason to hide
your private LAN IP addresses, and the port-forwarding target also
includes a port number.> Via a web browser [...]
So, presumably ("http://"), your port-forwarding rule must specify
internal port 80. Does it?> I haven't assigned a static IP at this point, but I it's a small
> homenetwork, so unless something radical changes, [...]Like a power interruption anywhere? A static address is configured
on the device itself. You'd probably be happier with a reserved dynamic
address for the camera, configured on the router (DHCP server):
ADVANCED > Setup > LAN Setup : Address Reservation.
> I am not using NAT. [...]Of course you are. Your camera IP address (currently "192.168.1.7"?)
differs from your external IP address. NAT is what makes that work (if
it ever does).> I was worried this might be an issue. I don't know how to get the
> RMTP for the camera.You don't need that. What you do need is a port-forwarding rule
which specifies the Internal (LAN) port number used by the camera,apparently 80.
> [...] From a system on your LAN, using the
> router's WAN/Internet IP address:external_port?> I can get to it from my side of the router via either my PC or my
> cellphone. [...]
Using the router's WAN/Internet IP address:external_port? Not with
that port-forwarding rule.If a normal web browser on a system on your LAN works with a simple
URL (like, say, "http://192.168.1.7"), then the camera must be listening
at port 80, and your port-forwarding rule must specify internal port 80.The external port number is your choice, but if it's not 80 (and it
probably shouldn't be), then you'd need to specify it in any URL which
includes your external IP address. For example:Part of the Translation in NAT is from the external (WAN) IP address
to the internal (LAN) IP address. Another part is from the external
(WAN) port number to the internal (LAN) port number.