Cannot ping

[enedil]

I had a problem, that my home wifi router is situated just on the other end of my house than my desk and connectivity is really low. However I really wouldn't like to have a long cable that goes through whole house, and thus I thought that I might put my RPi 4 in my room (on the other end, where the signal is still quite strong), and from there connect my laptop with RPi with cable.

Now come the problems. The RPi is connected to wifi (wlan0 interface). I connected laptop and RPi by cable. I'm using Raspberry Pi OS and it automagically setup an IPv4 address (169.254.72.25/16). On my laptop, I'm using Fedora and use NetworkManager for connectivity. I tapped on wired connection settings, added static IP 169.254.72.26/16 with gateway 169.254.72.25. After these manipulations, I can ping my rpi through cable (ping 169.254.72.25 works). However, if I try ping 192.168.0.13 (this is the ip addr of rpi on wlan0), I never get responses. My local wifi network is 192.168.0.0/24.

Routes on both devices:

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~ $ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         169.254.72.25   0.0.0.0         UG    20100  0        0 enp0s20u1
169.254.0.0     0.0.0.0         255.255.0.0     U     100    0        0 enp0s20u1

RPi:

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pi@raspberrypi ~> /sbin/route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG    303    0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     202    0        0 eth0
192.168.0.0     0.0.0.0         255.255.255.0   U     303    0        0 wlan0

I also checked whether the ping actually reaches the RPi, so I used tcpdump on RPi, and there are lines like

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No	Time		Source	Destination	Protocol	Length	Info
26	1.561827	0.0.0.0	192.168.0.13	ICMP		98	Echo (ping) request  id=0x000f, seq=2/512, ttl=64 (no response found!)

What can be done here?

[DougieLawson]

Get a powerline WiFi extender.

https://www.tp-link.com/uk/home-network ... a8630-kit/

[enedil]

That's a good suggestion, but I would anyway like to discover what was the problem in the aforementioned setup. This has to have something to do with RPi, as packages reach it, but it doesn't respond.

[RamaSpaceShip]

Get a pair of power line Ethernet devices.
I found them the best solution when Wifi has troubles.

[pi-anazazi]

169.254.72.x = LinK Local, non-routable IP...

[enedil]

169.254.72.x = LinK Local, non-routable IP...

That was it <3