Не уверен, какие у тебя есть эхо-устройства, но у меня их несколько (Echo Dot Gen1, Echo Dot Gen 3, Echo Dot Gen5, Echo Gen 1, Echo Plus Gen1 и FireTV Cube Gen1). Из всех этих устройств отвечает на ping только FireTV Cube.

root@Vitek-UDM-Pro:~# for i in 27 34 65 95 97 156 231; do ping -n -c1 -W3 192.168.30.$i; done
PING 192.168.30.27 (192.168.30.27) 56(84) bytes of data.

--- 192.168.30.27 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

PING 192.168.30.34 (192.168.30.34) 56(84) bytes of data.

--- 192.168.30.34 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

PING 192.168.30.65 (192.168.30.65) 56(84) bytes of data.

--- 192.168.30.65 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

PING 192.168.30.95 (192.168.30.95) 56(84) bytes of data.

--- 192.168.30.95 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

PING 192.168.30.97 (192.168.30.97) 56(84) bytes of data.

--- 192.168.30.97 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

PING 192.168.30.156 (192.168.30.156) 56(84) bytes of data.
64 bytes from 192.168.30.156: icmp_seq=1 ttl=64 time=0.874 ms

--- 192.168.30.156 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.874/0.874/0.874/0.000 ms
PING 192.168.30.231 (192.168.30.231) 56(84) bytes of data.

--- 192.168.30.231 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

Если я сосредоточусь только на FireTV Cube, то смогу пинговать его из шлюза или той же VLAN, но не из другой. Похоже, что FireTV игнорирует ICMP извне его локальной сети.