Hello! I have just recently got my MikroTik router and have been accessing the settings via winbox.
I have my MikroTik RB951Ui-2HnD and my Linksys WRT54GL (DD-WRT).
I want to use my MikroTik for the upstairs area of my home and do a slave to master to my Linksys WRT54GL (Wireless’ly) but I am stuck and have no clue what to do and I am quite new to MikroTik so what I am asking is any help but try to keep it simple since I am a bit of a noob.
Thanks! 
So by slave, you mean “additional access point” on the network, but the WRT should still be the router for the network…
So the thing to do is make the Mikrotik into a simple bridge.
Firstly, I’m going to assume that your network uses 192.168.1.x as the IP range, and 192.168.1.1 as the default gateway.
I’m going to use 192.168.1.2 as the IP address for the Mikrotik - if this address is taken already on your network, then choose whatever address makes sense for you.
First, I’d recommend looking through the Quickset menu to see if you can just choose “AP” mode there - that would make it really easy.
If not, or if you want to do it yourself for learning purposes, then make sure there’s a bridge interface (interfaces menu) and if so, then it probably has the wlan1 interface and one or more ethernet interfaces attached. If not, then create one, and in the ports menu, connect the master ethernet interface (probably called ether2-local-master) and wlan1. Then go into IP > DHCP server and disable/remove the DHCP service, IP Network, and IP > Pools.
Go into IP > Addresses and set address 192.168.1.2/24 on the bridge interface. Go into IP > Routes and set the default GW to be 192.168.1.1 (it will be a static route whose destination is 0.0.0.0/0 - set the next hop on this) - and remove IP > DHCP Client from the ether1-gateway interface.
You can now set ether1-gateway to use master-port=ether2-local-master, and rename it to ether1-local-slave.
OK - this is all ready to go except for the wlan settings - you should set the security profile to use aes2 (and no tkip) for both the unicast and multicast/broadcast cipher, and set the key to be whatever you want the WiFi password to be - I recommend making it the same as the main router’s WiFi password. Also, set the SSID to be the same as the main router. You should be good to go - just connect any ethernet port to an available LAN port of the WRT, and you’ll be up and running.
Hello ZeroByte thanks for the reply! I am having some trouble but would it be possible to setup my MikroTik router I am going to use as AP to do it all wirelessly instead of using LAN ports? sorry if I sound like a dumbass for asking this question.
My Linksys WRT54GL (DD-WRT) supports it. Not sure about my MikroTik though.
Edit: Master Router (Linksys WRT54GL DD-WRT) 192.168.1.1. Slave (MikroTik) 192.168.88.1.
It’ll be such a waste if the RB951Ui-2HnD is just used as an AP. Why not use the Mikrotik as the router replacing the Linksys?
It might even be good enough to cover both floors.
Well I am not sure if it will get a good coverage but I would be happy to use it as Master but I am mainly focusing on AP unless it is easier if I setup Linksys Router as Slave and MikroTik as Master.
Update:
I have set it up under Quick Set like this. (This is for the slave router)
PTP Bridge
-------Wireless Bridge Mode-------
Wireless Bridge Mode: Client/CPE
-------Wireless-------
status: connected to ess.
AP MAC: (Is connected properly and detects MAC address of the other router)
Network Name: dd-wrt (SSID of Master Router)
Wireless Protocol 802.11
-------Configuration-------
Address Acquisition: Automatic.
Address Source: Any.
IP Address: 192.168.1.100
Netmask: 255.255.255.0 (/24)
Gateway: 192.168.1.1
-------System-------
Router Identity: MikroTik
I have no idea if I have set up something wrong or what but when I try to browse the net it acts like there is no internet connection at all.
Oh and master router is set up as AP.
You’re talking about making it into a repeater.
That’s really a last-resort solution. You can only get 50% bandwidth when connected to a repeater because the repeater must use 1/2 of its time talking to the client devices, and the other half repeating it to the main access point. They can also lead to interference and other issues.
If you can run a cat-5 cable between the two devices, that would be very superior. Or perhaps a MOCA adapter would be useful for you.
If it must be a repeater, the bridge configuration I gave above is still perfectly fine, you just have to set the radio in the right mode.
Here’s a thread on the subject:
http://forum.mikrotik.com/t/mikrotik-rb751u-2hnd-as-repeater-preferably-with-working-u/56007/1