Using both Wlan0 and Eth0 trouble with fixed IP

[michaelmichael]

Hi all!

i am experiencing this problem - I don't know if it's common but I coulnd't find a solution through search...
I have multiple Pi3s connected to a router via ethernet, but the WLAN is also active, I use it to ssh into the Pis via hostname, the ETH0 is used so they can talk to each other.

So I need a static IP for ETH0 on one of the Pis. As soon as this is activated, I cannot access it through WLAN anymore. I can still ssh into another Pi and then, via ethernet, connect to this one, but it can't be found in the Wifi anymore.

Is there any way around this? Right now it's more a comfort issue, also I don't know too much about network technology, but I feel like this should be an easy one to fix if one knows where to look...?

[SurferTim]

Not enough info. How did you assign the static settings? What are the settings on the other RPis?

Maybe if you post the output of ifconfig and route somebody may see the problem

Code: Select all

ifconfig
route

Edit: The symptom you describe could be caused by overlapping localnets. The ethernet interface has priority, so if you have both assigned the same localnet, eth0 will be used as the default.

[klricks]

The easiest way to do this is to use DHCP reservations to MAC address settings in your router. Do not change the settings on the RPi .. Leave them set to DHCP.
Be sure to assign different IPs to WIFI and Ethernet.

[michaelmichael]

Not enough info. How did you assign the static settings? What are the settings on the other RPis?

Maybe if you post the output of ifconfig and route somebody may see the problem

Code: Select all

ifconfig
route

Edit: The symptom you describe could be caused by overlapping localnets. The ethernet interface has priority, so if you have both assigned the same localnet, eth0 will be used as the default.

Oops sorry, I totally forgot to put all the crucial info: The pis run on the latest Raspbian stretch release, I set individual host names through raspi-config and the static ip in dhcpcd.conf. That's all. I'll post the ifconfig output as soon as I ca get around to (don't have the pis here)

[SurferTim]

No thing. While you are at it, ensure you are not using an IP that has already in use or has been issued by the dhcp server on that network.