Hi Guys,
I have mikrotik as core router with hotspot running. I have WRT54G with DD-WRT flashed running as ap connected to the Mikrotik via hub. This set up has been working well. The only problem is hotspot will only authanticate one client, after the first client authanticate, everybody else can access internet without having to login. Hotspot login page does not come up after first client authanticate.
Please help. Thank you 
I think you mean the clients connected to this router ?
You have to ensure that this device is acting as true bridge, then every user will be provided with login page.
This is the problem with DD-WRT. It’s unable to act as a real bridge.
Ha, Ok, Thank you guys, I was not sure,
That’s not true, DD-WRT can act as a true bridge. Just don’t use the WAN port, or set the Internet Connection to disable and assign the WAN port to the br0 bridge. If you do the latter you’ll essentially have a 5 port switch with added WiFi. That will solve your problem.
You see, right now Mikrotik Hotspot authenticates the single WAN ip of the WRT with the WAN port’s MAC. It doesn’t know about what’s going on behind the WRT’s nat.
I replaced the dd-wrt with a Hub, I still have the isuue. I connect 4 computers to the hub, only the first client can authanticate. Everybody go through without authatication.
Shouldn’t it work fine with the hub.
Thank you
At least in wireless client mode, DD-WRT acts like a pseudo-bridge. I can confirm that.