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Fix typo on README.md 

Incorrectly wrote DHCPv4 as DCHPv4. This fixes that.
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Jon Drews 2021-11-12 23:40:54 -05:00 committed by GitHub
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@ -18,7 +18,7 @@ First, let's talk about what happens in the standard setup (without any bypass).
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.
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.
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 DHCPv4 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