[dpwm]

iftop is a remarkably useful utility. It's often one of the first things I install on new openwrt installations.

[acranox]

Ever since I installed SQM on openwrt, I don’t really care what’s using the bandwidth anymore since it doesn’t impact any other users on the network. :) It’s true though that iftop is a very useful tool.

[joshspankit]

Still nice in some cases to find applications/devices that are going wild due to a bug

[iso1631]

iftop (and ifstat) are part of my preseed file, along with tcpdump, (and htop/iostat/pidstat/mpstat)

For a router I'd also put ntopng on.