Difficulty connecting to port forwarded FTP from inside the network

[RicardoF1RST]

Hi, just installed a D7000 as my home router and I have allocated an IP to my Buffalo NAS which is running an FTP server. Its connected to the D7000 via cable and I have port forwarded 20 & 21 to the correct IP. I have a noip ddns address which is correctly configured and updated.

If I connect to the internet external to my home network, I can access the FTP server as normal. But from within the network I cannot use my FTP client (just errors when trying to connect). I can access the FTP as a local drive though so not a major issue.

But is there a way I can configure things (static route?) so that my FTP client will work both inside and outside the LAN? - just means I can always access the same way thats all.

Thanks for any assistance / ideas.

[antinode · Accepted solution]

> Crawl back in your hole parasite.

   You're welcome.

[antinode]

> Model: D7000|Nighthawk AC1900 VDSL/ADSL Modem Router

   D7000[v1] or D7000v2?  Look at the product label.  Firmware version?
Connected to what?

> [...] I have a noip ddns address which is correctly configured and
> updated.

   Does that mean that you're (effectively) using the router's
WAN/Internet IP address (your public IP address?) from within your LAN?

   I'll guess that your D7000 is actually a D7000v2.  D7000v2 firmware
(all versions, so far as I know) is defective in that "NAT loopback"
does not work.  Without that feature, attempts to use the router's
WAN/Internet IP address (or a DNS equivalent) from within your LAN are
doomed to fail.

      https://community.netgear.com/t5/x/x/m-p/1566171

> But is there a way [...]

   I know of nothing simple.  Because of the firmware defect, you need
to use a different (LAN) IP address when on the LAN, and I see no
practical way to arrange that when using the router as the DNS server.

> [...] (static route?) [...]

   Nothing which you could specify from the management web interface.

[RicardoF1RST]

Thanks for the reply. Makes sense. I wouldn’t use the word “defective”, missing feature maybe and something I’m happy to live with if need be. Odd that the R7000 appears to have functional NAT loopback though. Hey ho.

[antinode]

> [...] I wouldn't use the word "defective", missing feature maybe [...]

   You and Netgear.

> [...] and something I'm happy to live with if need be.

   I certainly wouldn't hold my breath waiting for Netgear to fix the
problem (or add the enhancement, if you prefer).

> [...] Odd that the R7000 appears to have functional NAT loopback
> though.

   D7000[v1]?

   I'd say that what's odd is that the D7000v2 has this bug.  In one
firmware release after another, year after year.  I'm always open to
enlightenment, but, so far as I know, the D7000v2 is unique among
Netgear (modem+)router models in having this bug.

   The way Netgear support and engineering jumped right on this problem
and resolved it says much about the whole organization.  I quote (Eduard
Expert ID: 8305 NETGEAR L2 Support Expert, Case #42127093, 2020-01-21):

      Our engineering team confirmed that DSL products like the D7000
      and D7000v2 does not support NAT Loopback. They added that they
      don't have plans on adding this feature in the future.

   Of course, it works just fine on my D7000[v1].  Perhaps _that_ is the
bug.

[RicardoF1RST]

“undocumented feature” 🙂

The reason I’ve upgraded to the D7000 is thanks to a strange problem that a specific private website poses such that my wife’s manager (she’s a chat support worker) says we need BT broadband because “they’ve had issues with TalkTalk and Vodafone”.

Vodafone say it’s the website, the website says it’s Vodafone. I’ll find out if my plan works next Tuesday. Symptom appears to be some routers won’t resolve the specific web address to an ip even using other DNS. Even downforanyoneorjustme says the site is down when it isn’t. Using Google DNS (8.8.8.8) the site was unresolved using the Vodafone router but the Netgear resolved it fine with the same DNS.

Out of interest do you know what make of chipset the D7000v2 uses?

[antinode]

> Out of interest do you know what make of chipset the D7000v2 uses?

   Don't know, don't care, but I'd bet that your Web search would work
about as well as mine would.

[RicardoF1RST]

In that case I'm surprised you could be bothered to press keys on your keyboard.

Crawl back in your hole parasite.

[antinode · Accepted solution]

> Crawl back in your hole parasite.

   You're welcome.