I'm facing problems with multicast when setting up my Raspberry Pi 3b+ with Raspbian Stretch as an access point. Everything seems to be set up fine. I can ping multicast from another computer in the access point and the Raspberry Pi sends a response.
Here 10.0.0.20 is my PC and 10.0.0.2 is my Raspberry Pi which hosts the AP. So far so good.
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[email protected]:~$ ping 188.8.131.52 PING 184.108.40.206 (220.127.116.11) 56(84) bytes of data. 64 bytes from 10.0.0.20: icmp_seq=1 ttl=64 time=0.135 ms 64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=2.15 ms (DUP!) 64 bytes from 10.0.0.20: icmp_seq=2 ttl=64 time=0.088 ms 64 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=2.34 ms (DUP!) 64 bytes from 10.0.0.20: icmp_seq=3 ttl=64 time=0.126 ms 64 bytes from 10.0.0.2: icmp_seq=3 ttl=64 time=2.57 ms (DUP!) ^C --- 18.104.22.168 ping statistics --- 3 packets transmitted, 3 received, +3 duplicates, 0% packet loss, time 2003ms rtt min/avg/max/mdev = 0.088/1.238/2.574/1.129 ms
If I try it the other way around I get :
https://www.raspberrypi.org/documentati ... s-point.md
reads back a 0 on both devices.
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When I connect the Raspberry Pi with a regular wifi network I can ping multicast and get a response from each device. So I am pretty sure the access point is faulty in some way.
Maybe I have to change something in /etc/hostapd/hostapd.conf? I tried to find something regarding the hotspot setup but found nothing.
I don't know if it matters that the AP is supposed to be local only. I am not interested to connect to the internet in some way.
I appreciate every help with this as I am a real newbie regarding network issues.
Thanks in advance!
EDIT: I just connected a second Raspberry Pi 3b+ with identical settings to the access point and tried to ping 22.214.171.124. I expected it to work just like the ping from my PC. In fact I got the same error message as with the other Raspberry Pi. Just to make it clear
Raspberry Pi: Can ping multicast in home wifi, cannot ping multicast in access point
HP-Laptop(running Ubuntu 16.04): Can ping multicast in home wifi, can ping multicast in access point and gets response from RPi's
Seems like this is an Raspbian/Debian issue? But then is the question why does it work connected to my wifi but not if connected to the access point?