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Forum Discussion
Unable to get port forwarding to work on R7800
I can't get port forwarding to work at all on my R7800. Here's what I'm doing:
- 'Advanced' tab -> 'Advanced Setup' -> 'Port Forwarding/Port Triggering'
- From the 'Service Name' drop-down, select 'HTTP'
- Enter the IP of the destination server
- Click '+ Add' button and the service appears successfully in the port forwarding list
- Start web service on destination server (for testing, the firewall on this server is disabled)
- Confirm web service is reachable by connecting to its default web page from another system on the LAN
- Attempt to connect from a system on the WAN side by doing 'telnet [public IP] 80': no response
- Attempt to do the same from a system on the LAN: no response
I've tried this with several different port, using TCP, UDP and both, but nothing gets forwarded.
My network is pretty simple:
Comcast modem -> R7800 -> wired and wireless clients
Any ideas? Something to do with the modem, maybe?
4 Replies
> Comcast modem -> [...]
Not a very detailed description of that device. Has it a maker and
model number? Is it actually a (simple) modem (good), or is it a
modem+router (bad)?> - Attempt to connect from a system on the WAN side by doing 'telnet
> [public IP] 80': no responseWhat is "[public IP]"? If you're worried about revealing secrets,
then the top half of the address, "a.b" out of "a.b.c.d", would satisfy
most of my curiosity. Or, plug that address into the form at:
https://whois.arin.net/ , and see if it is a public or private address.What's the IP address of the WAN/Internet interface on the R7800
(ADVANCED > ADVANCED Home : Internet Port : Internet IP Address)? Same
or different?For the usual problems with port forwarding, see:
https://community.netgear.com/t5/x/x/m-p/1859106
I'd worry about "1". You seem to have covered the others.
Thanks for the reply! Answers to your questions below...
"Has it a maker and model number?"
Arris TG862
"Is it actually a (simple) modem (good), or is it a modem+router (bad)?"
It's a modem + router. I thought I'd disabled the router part but now when I try to login to check, it doesn't let me. (I'm waiting on Comcast to do a password reset on it.)
The WAN-side IP associated with my Comcast account, i.e. 24.21.x.x (the output of https://icanhazip.com, for example).
"What's the IP address of the WAN/Internet interface on the R7800?"
10.0.0.6 - it's getting that from the modem.
"I'd worry about "1"."
Yeah, I think you're right: looks like 24.21.x.x is the modem's WAN address and the R7800 doesn't know about that. (Because why would it?) So I guess I really need to get into that modem and set port forwarding there. Or else (hopefully) find a setting that'll just make it pass everything through unchanged.
> 10.0.0.6 - it's getting that from the modem.
There's your problem. (That's why it's "1" in the list.)
> [...] So I guess I really need to get into that modem[+router] and set
> port forwarding there. Or else (hopefully) find a setting that'll just
> make it pass everything through unchanged.Yup. If the TG862 has a modem-only ("bridge") mode, then you could
use it with the R7800 acting as your (only) router. Otherwise, with the
TG862 in modem+router mode, _it_ could do the port forwarding, and the
R7800 could be configured as a wireless access point. (It's in the
R7800 User Manual.)You might have a chance with the TG862 in modem+router mode, and the
R7800 acting as its DMZ server, but no bets.