Merge pull request MonkWho#34 from owenthewizard/patch-1

Add info about VLAN Priority Tagging

README.md

@@ -17,9 +17,9 @@ Before continuing to the setup, it's important to understand how this method wor
 First, let's talk about what happens in the standard setup (without any bypass). At a high level, the following process happens when the gateway boots up:
 
 1. All traffic on the ONT is protected with [802.1/X](https://en.wikipedia.org/wiki/IEEE_802.1X). So in order to talk to anything, the Router Gateway must first perform the [authentication procedure](https://en.wikipedia.org/wiki/IEEE_802.1X#Typical_authentication_progression). This process uses a unique certificate that is hardcoded on your residential gateway.
-1. Once the authentication completes, you'll be able to properly "talk" to the outside. But strangely, all of your traffic will need to be tagged with VLAN id 0 before the IP gateway will respond.  I believe VLAN0 is an obscure Cisco feature of 802.1Q CoS, but I'm not really sure.  
-1. Once traffic is tagged with VLAN0, your residential gateway needs to request a public IPv4 address via DHCP. The MAC address in the DHCP request needs to match that of the MAC address that's assigned to your AT&T account. Other than that, there's nothing special about the DCHPv4 handshake.
-1. After the DHCP lease is issued, the WAN setup is complete. Your LAN traffic is then NAT'd and routed to the outside.
+2. Once the authentication completes, you'll be able to properly "talk" to the outside. However, all of your traffic will need to be tagged with VLAN ID 0 (a.k.a. VLAN Priority Tagging<sup>[[1]](https://wikipedia.org/wiki/IEEE_802.1Q#Frame_format)[[2]](https://www.cisco.com/c/en/us/td/docs/switches/connectedgrid/cg-switch-sw-master/software/configuration/guide/vlan0/b_vlan_0.html)</sup>) before the IP gateway will respond.  
+3. Once traffic is tagged with VLAN0, your residential gateway needs to request a public IPv4 address via DHCP. The MAC address in the DHCP request needs to match that of the MAC address that's assigned to your AT&T account. Other than that, there's nothing special about the DCHPv4 handshake.
+4. After the DHCP lease is issued, the WAN setup is complete. Your LAN traffic is then NAT'd and routed to the outside.
 
 ## Bypass Procedure