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I want to use a Rasperry for a very special use case: I have one IoT device, which is not and should not connected to my normal network. That device (an energy meter) should have a fixed IP and connected via ethernet to the Raspi. The Raspi provides an AP with a special SSID. I connect my Phone/Laptop only to it, when needed. WIFI client needs to get an IP via DHCP from Raspi.

I tried that setup yesterday with RaspAP, but was not successful. I was able to connect to the Raspbi via Wifi, but never to the IoT device.

All examples i found have been for Accesspoint mode with an external router or bridge mode with an external DHCP server.

Something I never understood as well: can I have the same IP range on eth0 and wlan? Something like that:

IoT Device  -------------------- Raspi ------------------------- Client
================  ------------ ==================== ---------- ====================
IP: 192.168.2.3 :: => eth <= ::eth-IP: 192.168.2.1              192.168.2.100-200 
static                         wlan-IP: 192.168.2.2 => WIFI <= ::DHCP-Client
================  ------------ ==================== ---------- ====================
Matthias Zirngibl
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  • You will be better off asking on RaspAP's issues page on GitHub, but as far as I know, you will need a different subnet for your AP side. There is a [bridged AP mode](https://github.com/billz/raspap-webgui/wiki/Bridged-AP-mode), but there seem to be some issues/limitations. I had to disable the AP and use exclusively the LAN port, plus some custom scripts to keep my settings persistent. If you only have DHCP issues, [this](https://github.com/billz/raspap-webgui/issues/324#issuecomment-621948033) might help you. – Kostas C. Jul 03 '20 at 09:33
  • Problem with bridged mode is, that you have to run a separate DHCP server on eth-side, AFAIK? – Matthias Zirngibl Jul 03 '20 at 13:14

1 Answers1

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What about setup of regular AP with hostapd and dnsmasq, just without enabling local IPv4 forwarding in /etc/sysctl.conf (or setting net.ipv4.ip_forward=0)?

Marlab
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