anchor.diff:  VLAN - Virtual LAN. Note that on the 871W, you can not assign a specific IP or DHCP group to the physical interfaces. You must assign the interfaces to be part of a VLAN and then the VLAN can be assigned a DHCP pool for IP assignment.  
   Advanced Security or Advanced IP - Cisco offers two flavors of software to run on their routers. The "PIM" capabilities are in the Advanced IP package, not the Advanced Security package despite the need for a VPN tunnel! Make sure you are running a package with the K9 designator because it has AES/3DES encryption.
   ACL - Access Lists. These allow you to choose what traffic can and can not go through your router.
  +NAT - Network Address Translation. This is a technology that allows your router to create a sub network and, through the use of differing ports, pass the traffic through one (public) IP. "ip nat inside" tells the vlan to NAT ip that are connected to it, and "ip nat outside" tells the interface (you would execute this command on your WAN port) to NAT traffic to the outside world.
  +dot1Q - This is to tell your wireless interface to use a specific vlan. For example "encapsulation dot1Q 10 native" uses vlan 10.
   
   == Step 2: Hardware
   In addition to the 800 series Router, to get started, you'll need a so-called "Rollover Cable". http://www.ebay.com/sch/i.html?_nkw=cisco+rollover+usb&_sacat=0
  
positive.code: "no XXXX" -- Removes or takes away a command. For example, if you type "no shut", then it will bring UP an interface. Likewise, "no ip pim sparse-mode" will REMOVE the "ip pim sparse-mode" from the configuration. 
  
  
  I recommend "write erase" first (to restore factory configuration), and then building out your topology from there.
  Next, "enable" to go into priviledged mode.
  Then, "show running-config" to see what the initial configuration looks like. 
  Lastly, "config t" so you can start changing settings.
  
  
  
  http://stevehardie.com/2013/05/cisco-877w-configure-wireless-and-wired-on-single-subnet/
  https://supportforums.cisco.com/discussion/11801006/does-configuring-two-vlans-cisco-871-router-divides-bandwidth-internet-half
  https://supportforums.cisco.com/discussion/10567086/change-ip-router-cisco-871
  
  
  
negative.code: 
  == Step 3: Big Picture
  Create two VLANs, one for public IP traffic ("Vlan 10"), and the other for CME New Release traffic ("Vlan 20"). For wireless models, you'll add the wireless connection to be part of Vlan 10.  Assign two of the fast ethernet ports to vlan 10, and the other two to Vlan 20. This will allow you to have two physical connections to public IP and two to New Release. You can always attach a switch to a vlan 10 port to expand access to other devices.  To have the appropriate IPs assigned to each VLAN, you'll create two DHCP pools for which IPs can come. On the vlan 10, you can stay with the traditional 192.168.1.x range and on vlan 20, you must use the range that the CME assigns you. 
  
  Note for Wireless users: In order to get wireless working propertly, you'll need to create a "bridge group". At a high level, this allows you to bridge the physical interface with the wireless interface into the same group. Note: don't assign an IP address range to vlan 10, just tell it to be part of the bridge group and with "no ip address". Then, in the bridge group configuration, you will assign the IP range for which the DHCP pool exits. However, for vlan 20 (because it's not part of a bridge group with a wireless interface), you will assign an ip range that matches what CME tells you. 
  
  
  == Step 4: Configure Router
  
  