tc.js uses different interfaces for up and down

[ibc]

• For down is calls tc with "ifb0": https://github.com/sitespeedio/throttle/blob/master/lib/tc.js#L61
• For upd it calls tc with iFace: https://github.com/sitespeedio/throttle/blob/master/lib/tc.js#L76

It's a bug, right?

[soulgalore]

Yeah, this looks strange, and I guess it will not work if you are not using ifb0 then? I think this was ported directly from the settings from WPT. Let me have look before I release the next version.