Networking and servers • assymetric ping behavior with a pi5 as a wifi base station

I have a pi5 set up to act as a wifi base station with the following nmcli commands:

nmcli con delete AP
nmcli con add type wifi ifname wlan0 mode ap con-name AP ssid $SSID autoconnect true
nmcli con modify AP 802-11-wireless.band a
nmcli con modify AP 802-11-wireless.cloned-mac-address 00:12:34:56:78:9a
nmcli con modify AP ipv4.method shared ipv4.address 192.168.4.1/24
nmcli con modify AP ipv6.method disabled
nmcli con modify AP wifi-sec.key-mgmt wpa-psk
nmcli con modify AP wifi-sec.psk "$pw"

$SSID and $pw are of course bash variables whose values I have omitted here.

I have a laptop connected to the pi's network. When I ping the pi from the laptop, everything seems fine, no appreciable packet loss. But then I ssh to the pi and ping the laptop from the pi and it drops packets like crazy. I'm no networking expert, but this seems odd, as a ping is a round trip, so it's hard to see how the performance could be asymmetric. I've never seen anything like this before, including when operating a Pi4 as a base station with earlier versions of Raspberry Pi OS (pre nmcli).

Any idea what could be wrong or any suggestions on how to debug this?

Statistics: Posted by edwardpier — Sun Nov 17, 2024 2:46 am — Replies 0 — Views 30

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