How to set port forwarding for Home Assistant when you have a Fritz box 7530 with a TPlink Deco M9 connected to it

Configuration
1

Hi,
I have a Fritz box router with a TP-link Deco M9plus connected to it. In the Deco network is a device running Home Assistant.
Can anybody tell me how to set the port forwarding in both the Fritz box and the Deco M9plus, so that i can reach the home assistant system via Duckdns?

2

Is there a reason n to use double NAT’ing?

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3

I have very limited knowledge of networks and donot know what double NATing is. Preferably i donot want to change my whole setup and maybe loose some current connectivity that i now have. With my limited knowledge i thought that port forwarding was the easiest solution.

4

Depends which is being used as the router I guess. I have a FritzBox 7590 and Deco P7 but use the FritzBox as the router and the TP-Links as just wifi mesh. I have the port forwarding then just setup in the FritzBox settings.

5

The setup Philip_Embleton is describing is the common setup.
Double NAT’ing, where both act as router divide the network, so you will have internet on WAN side of the Fritzbox, LAN 1 on the other side of the Fritzbox, LAN 1 on the WAN of Deco router and LAN 2 of the other side of Deco router.

LAN 1 will not be able to see devices on LAN 2 and vice versa, unless you make some port forwarding and some things might require more than just portforwarding to work.

6

To complement Wally, you can simply put your deco to “Access point” mode in the tplink app to have your router and devices linked to the deco in the same network.

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7

Thank you all for replying.
I did change the mode to access point, but found out that everytjing got new ip adresses. As a result none of my existing home automation worked anymore. Since i have a lot i did not want to redo it all.
In the meantime i made it possible to reach my home assistant from the outside via Duckdns and letsencrypt. however casting to google hubs does not work yet. I get a logo and not connected.

8

Hi,

One option is to change the DHCP/LAN range on the Fritz!Box, for example from 192.168.178.1/24 to 192.168.1.1/24.

Double NAT isn’t ideal :wink: and can cause communication issues.

9

Thank you! that sounds good.
one more question: if i change the mode to Access point and change the DHCP/LAN range to 192.168.1.1/24. Am i then running double NAT?
I get a lot of warning not to do so.

10

The access mode should indicate you are not running a NAT on the deco.
The other mode is probably router, which is NAT.

11

No. Double NAT is:

  1. LAN → Router -x-> Internet
  2. Devices → Deco -x-> LAN
12

Thanks, now i understand.