Another test
root@ubuntu-System-test:~# hping3 -c 3 192.168.10.103 HPING 192.168.10.103 (br-ex 192.168.10.103): NO FLAGS are set, 40 headers + 0 data bytes len=40 ip=192.168.10.103 ttl=64 DF id=44493 sport=0 flags=RA seq=0 win=0 rtt=4.3 ms len=40 ip=192.168.10.103 ttl=64 DF id=44612 sport=0 flags=RA seq=1 win=0 rtt=4.3 ms len=40 ip=192.168.10.103 ttl=64 DF id=44716 sport=0 flags=RA seq=2 win=0 rtt=4.3 ms
--- 192.168.10.103 hping statistic --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max = 4.3/4.3/4.3 ms
root@ubuntu-System-test:~# hping3 -c 3 -1 192.168.10.103 HPING 192.168.10.103 (br-ex 192.168.10.103): icmp mode set, 28 headers + 0 data bytes
--- 192.168.10.103 hping statistic --- 3 packets transmitted, 0 packets received, 100% packet loss round-trip min/avg/max = 0.0/0.0/0.0 ms
So qbrXXXX bridge drops ICMP packets.
Another test
root@ubuntu- System- test:~# hping3 -c 3 192.168.10.103
HPING 192.168.10.103 (br-ex 192.168.10.103): NO FLAGS are set, 40 headers + 0 data bytes
len=40 ip=192.168.10.103 ttl=64 DF id=44493 sport=0 flags=RA seq=0 win=0 rtt=4.3 ms
len=40 ip=192.168.10.103 ttl=64 DF id=44612 sport=0 flags=RA seq=1 win=0 rtt=4.3 ms
len=40 ip=192.168.10.103 ttl=64 DF id=44716 sport=0 flags=RA seq=2 win=0 rtt=4.3 ms
--- 192.168.10.103 hping statistic ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 4.3/4.3/4.3 ms
root@ubuntu- System- test:~# hping3 -c 3 -1 192.168.10.103
HPING 192.168.10.103 (br-ex 192.168.10.103): icmp mode set, 28 headers + 0 data bytes
--- 192.168.10.103 hping statistic ---
3 packets transmitted, 0 packets received, 100% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms
So qbrXXXX bridge drops ICMP packets.