I have a router which runs the Broadcom aeolus system: https://github.com/Broadcom/aeolus consisting of ecos and "normal" Linux. I want to dump all the WAN traffic (controlled by ecos I think) or at least the LAN traffic (controlled by Linux). The system is very limited, there are firewall rules, but nothing like iptables. Also something like tcpdump does not exist. There is busybox available and I could probably load a more recent version with more programs. Is there any decent way with busybox or other tools to get the data out via network or maybe dumping to an attached USB drive?
Since I want to capture WAN-LAN traffic and not (only) LAN-client PCs traffic, I need to do it from within the router. Sniffing the WAN signal going over coax is likely not trivial and requires special hardware which I probably can't afford.