Creating a wired network With internet working with a mifi and a old router

I would like to give credit to Murrkf from ddwrt forum and anyone else I
copied and pasted some the there work and or worked with me on this
and put it together to work for mifis.

go to [Only registered and activated users can see links. ] and see
if your router is compatable. Im using a old wrt50xxx I found in my garage.

Im using a Zte 890l Flashed but you can use any of the flashed ones im sure.

The Router/AP that you are trying to connect to is the primary router (your mifi) .
The Router you are configuring is the client router. You don't need to worry about the primary router (Mifi) router
as long as you set your client LAN IP address to a different subnet. What this means is, if the primary
router has an IP of 192.168.A.x, you need to set the client router to an IP of 192.168.B.x. Most primary
routers will be at, or So, when you are configuring your client router, set it to 192.168.2.x.
With that in mind, here is how to configure it:
Download the current recommended build for your router from [Only registered and activated users can see links. ]
Check the forum for your chipset to
find recommended builds and general information related to your hardware. If you are using a
Broadcom based router, read the peacock thread prior [Only registered and activated users can see links. ] to starting.
install the ddwrt to your router and make sure it work and follow the directions that are for your router
to the t.
Do a HARD reset on your router. the 30/30/30 reset hold reset for 30s unplug 30s more plug for 30s more
Connect a cable from your computer to the LAN port on your router.
Set your computer to a static IP address (e.g. Google how to change static ip if you dont know
Open a web browser and connect to to view the DD-WRT GUI.
You should be asked to change your password and username. Carefully type these in.
If you aren't asked for a password and username, do a hard reset, this time doing it
properly! Hit change password.
FIRST go to Wireless -> Wireless Security and enter the Security Mode and other key
information that matches your primary router that you will be connecting to over wireless.
Hit SAVE (not apply)
NEXT go to the Wireless -> Basic Settings and change the Wireless Mode to Client.
On that same tab set the Wireless Network Name (SSID) to exactly the same SSID as your
primary router you will be connecting to over wireless. Make sure spelling and capitalization
match. Note: If there are multiple routers broadcasting the same SSID, and you would like to
connect to a specific one (IE, the primary router, instead of the repeater), enable MAC Filtering
on the Wireless Tab, and add the MAC Address of the correct Access Point. The MAC Address can be
found on the "Site Survey" page, linked from the "Wireless" Sub-tab of the "Status" Tab. - Conjur
(Optional) Set the correct ack timing in meters. (Where?)
Hit SAVE (not apply)
NEXT go to Setup -> Basic Setup and change Connection Type to Automatic Configuration
- DHCP (most likely, but see NOTE below).
On that same tab in the Network Setup section set the Local IP Address to
(Your Client subnet MUST differ from the Primary Router subnet!).
(Optional) Set Static DNS servers in the Network Address Server Settings section if your
WAN type does not provide them or you want to use different ones than the AP provides.
(Recommended) Change your Time Zone and DST to match where you are.
(Optional) Set a Server IP/Name for in Time Setting section for NTP (it will use a hidden
default server if you leave it blank).
Hit SAVE (not apply)
(Optional) Go to Security -> Firewall and disable the SPI Firewall if you do not need to worry
about security between the AP and Client router.
Hit Apply.
Set your computer back to auto IP and auto DNS if you like. You will get a DHCP address from the router.
You are done and the Client router should connect to the AP within a minute or so. You may need to unplug
the router for 17 seconds if the router doesn't reset. After you ensure that it does connect and work properly
then you may configure any other settings you wish to (Virtual Interface for wireless connection for example).
NOTE: If the client router is externally managed, such as in a college dorm etc., you should Go to Setup ->
Basic Setup and set the WAN port protocol to what you need for the AP (mostly static, dhcp or pppoe).
This is the setting that is bonded to the Wifi interface. Fill in the needed info provided by your ISP
if this AP is externally managed. Note: This is what a computer (wired or wireless) connected to the
ROUTER would use to gain access to the network, not to be confused with the settings required to gain
access to the WAN by the ROUTER. Also note that the device should be in GATEWAY MODE instead of ROUTER mode,
otherwise Masquerade/NAT does not happen.