With fimware 3.5.6 on a ePMP 1000 SM 5 Ghz, I not able to dump traffic and indicate the interface through the -i option.
tcpdump "-i br-lan"
work fine but not
tcpdump dump "-i br-lan"
Every other options I tryed with dump enabled didn't return any error except -i. Any way to work around this or it's a bug ?