(router, nas) ==2.5gbe==(BPI R4 eth2) | lan1 ==1Gbe== desktop PC
Using Wireshark on desktop PC, I see a lot of LLC malformed packets from the NAS and router coming through, sometimes causing connection issues.
I got tcpdump installed on Openwrt, but is there any way to check if the LLC packet is already damaged at arrival on eth1, or damaged in bridge logic (bridger BPF), or sent out by lan1 in an improper way?
I got no idea how to debug this, so does someone have a clue?
You could tcpdump a pcap file capturing the relevant packets, and then copy the pcap file to the computer you have wireshark on, and use wireshark to read and display that pcap file, just like you displayed the capture. Then, you can compare them.
Actually, there’s a way to run wireshark and tell it to collect local capture as well as a remote capture agent; then, you will have literally the same packet being sent and being received, and can compare them directly.