Ping between two Beaglebone Black via Ethernet + PLC

[張景棠]

I have 2 BBB, following is the setting:
BBB1:
 IP: 172.1.2.1
 Netmask: 255.255.0.0

BBB2:
 IP: 172.1.3.1
 Netmask: 255.255.0.0

I connect as BBB - eth0(RJ45) - PLC - PowerLine - PLC - eth0(RJ45) - BBB
This method I can work fine on Beaglebone(White), but BBB cant work.(Only changed board)
Does anyone has idea? Thanks.

[Przemek Klosowski]

Run tcpdump on the network interface, check that the ICMP packet is actually getting out through the interface, and similarly check what does tcpdump see on the receiving system.

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[張景棠]

there is nothing shown on terminals.

My operator:

BBB1:

tcpdump -v icmp

tcpdump -i eth0

tcpdump -vvv

BBB2:

ping BBB1's IP

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[張景棠]

When I ping each other, both show "Destination Host Unreachable"