I am trying to setup either a Shaper or something that would tell all the traffic to a certain external IP address to be the highest priority for all data going out. However, I have no idea how to do this as I am very very very new to QoS, etc.
It sounds like this should be possible. Essentially, you need to "Mark" all of the traffic that you wish to prioritise and then ensure that the Marked traffic receives the highest priority on the router interface.
What equipment are you planning on performing this on? Is it a Cisco Router?
Do you mean that you want to mark the traffic so that the external network knows what are the priority packets, or do want to ensure that when there is congestion the priority packets are not delayed/dropped?
The problem when we want to prioritize traffic is that it has to be done where you'll have a "bottleneck". This is where the packets will start to be enqueued, usually that will be in a fifo queue if there is no QoS, and so the priority packets may be delayed unless you prioritize them. If the external network is already doing queueing based on packet marked, you'll just need to mark the packets on the router, if not, you'll have to make sure you don't send that traffic a higher rate than the external network bandwidth.
I'm telling this as you are talking about a shaper, in your case a shaper will be useful if you don't have control on the external network that has a lower overall bandwidth than your router interface speed. For example, if you have a FastEthernet interface but your ISP provide only 10Mb, you'll want to add a shaper at 10Mb on your router so that in case of congestion you can send the priority packets first, and since no other queueing should occur in the ISP network the priority packets won't be delayed.
You are not obliged to configure a shaper, and configure only queueing, so we'll enqueue the packets only when there is congestion (when the traffic rate is above interface speed) and the priority packets can leave the router first, the other packets will be enqueued.
If you need to match only packets to a certain destination IP address, a typical example is:
match access-list 100 !
!NOTE: there is an implicit class default that will
have the rest of the bandwidth
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