Can this be done, my Dad keeps changing my QoS because when i download it slows down his connection. Can i hide my computer from my router?

The short answer is no. I have mine set up just the opposite, that downloading is a lower priority than FF so that downloading never interferes with surfing. When it's not loading a web page downloading will still get full bandwidth, but it doesn't interfere with whatever anyone else is doing.

Anyway you can't hide your computer from your router.

There is an excellent method of "hiding" your computer from your router - unplug it. Unfortunately, that probably won't help you. "Hiding" the machine from the router means that nothing knows how to get packets to your machine--ergo, no connection.

If you don't have access to the router settings, your options are limited. You can hop IPs, or attempt to disguise the traffic in a way that gets through the QoS settings.

You can attempt to change the reported MAC address on your computer and then re-request a new IP. This will work so long as nobody else notices that your IP has changed and updates the QoS accordingly. This will NOT work if the router is configured such that only specific MAC addresses are allowed to pass traffic.

You can manually set your IP to something that's valid for your network, but you'll run into "this doesn't work at all" problems if another machine auto-configs to the same IP.

You can attempt to proxy/tunnel out to another machine if he's not throttling everything coming from your IP. A virtual machine with its own dedicated NIC can snag another IP (or the one that's being throttled) and at least provide a usable broswing experience for yourself.

All of this pretty much only works until someone who can change settings notices that something is wrong, spots the new IP, and figures out what's going on.

Now, for the part you'll probably gloss over and ignore:
If your dad/networkadmin is adjusting QoS to stop your torrenting from screwing over everyone else... he's probably right to do so and you, the user, are being a moron for not being nice to other people on the network. Especially if you're not paying for it. If you're going to evade his QoS, at least be intelligent (as well as thoughtful) and schedule your download fury while he's asleep or not on the network. You're playing a cat-and-mouse game here, and if you be an idiot about it, you will lose.

I say this as someone who's had to deal with BT on the network. I finally solved my problems with some pretty heavy QoS mechanics (HFSC queues on a server acting as a gateway) and flagging a specific machine for using BT. Running BT on a machine that's not configured to play nice with other traffic murders the browsing experience for everyone else. Running BT over a Wifi connection is also asking for trouble.

Heck, running BT through most consumer routers will cause the router to glitch and require reset.

I've had to reset some routers so many times because BT has confused it.

I used to live in shared accommodation and before I moved in everyone used to torrent and no-one could browse. In the end I mentioned something to the landlord and he put me in charge of the network and banned torrenting during normal hours. Not a problem especially as uTorrent has such a brilliant scheduler.

Then gain BT wasn't mentioned in the original post so if this is just standard downloading like updates or stuff like games/misc files then try and plan them for when your dad's not using the internet or put up with the slower speed.

If your router supports open source firmware like dd-wrt or openwrt you could do lots of nifty things like QoS bandwidth management/packet scheduling, control your ip mapping with iptables etc.
Essentially you can turn a $100 router into a $1000 router :P

like stonehenge00 said I have mine set up the same way then when I do nothing I do get a little boost but that is when I am sleeping if i really want something and can't wait but that is not very often,

I would just keep it at a slow pace my self so you could lice suggested because if your dad does know anything about computers he could do what ZEB said and stop your torrenting in the router just my thoughts

Except that the added stress generally causes those routers to crap out when dealing with data rates higher than 5Mbps. I know, I've dealt with them. A $150 computer can be set up to do pretty much the same thing more reliably (see pfSense for a dedicated solution).

Oh, and I think iptables is a cryptic piece of shit. PF that's available to the BSDs (OpenBSD, FreeBSD, and NetBSD) is just as featured and a heck of a lot easier to configure.

As Zeb said utorrent has a nifty scheduler were you can set downloads types Full speed or Limited speeds, so you could set you download rate to limited "you also set that" say 50% of your download the times your dad is home and using the net, then the other times Full speed.

Thanks for all the help guys, you have given me a lot more info than I expected. I will just do as most of you suggested and download when my Dad is not using the internet. I can't really moan to be honest because I don't pay for it and I use it more than anyone else.

Sounds like the sensible answer.

Domestic routers don't have a great life expectancy anyway. I agree with the ebox method and I have used pfsense, which is extremely basic and great for home use as out-of-the-box layer 3 filtering, but Untangle which is layer 7 is better for that job IMO, but a combination of both play nice together - decent options for home use.