Did you enable natting as mentioned in Step 1 on that guide (if you did, 
disabled it).

On 12/27/2013 11:23 AM, Mark Stephenson wrote:
> We are setting up PPPOE using Mikrotik routers at our towers. We have an
> external radius and the plan is to have username/password
> authentication, radius assigned IPs, and PPP protocol from Ubiquiti
> client equipment to the Mikrotik router at each tower. We setup these
> parameters in the radius server to do this:
>
> radcheck table:
>     Cleartext-Password              password
>
> radreply table:
>     Framed-IP-Address              desired ip address
>     Framed-IP-Netmask             desired net mask
>     MS-Primary-DNS-Server       desired ip of the dns
>     MS-Secondary-DNS-Server   desired ip of the second dns
>     Mikrotik-Rate-Limit              rate limit like 1M/1M
>
> The Mikrotik router (currently version 5.21 RB750UP) has the PPPOE
> service running and radius authentication to our external radius server.
> We used http://wiki.mikrotik.com/wiki/Pppoe_with_external_radius as a
> starting point, but it assumes dynamically assigned IPs from a local
> pool not IPs assigned from the radius server.
>
> We set up our Ubiquiti client equipment as routed with PPPOE and entered
> the PPPOE username and the password. The Ubiquiti client equipment
> connects to a Ubiquiti access point that is bridged and then to a
> Mikrotik router at the tower. The tower then connects to backhaul radios
> to get back to our main tower and our core router.
>
> The good news is that this mostly works! The Ubiquiti client connects
> wirelessly to the access point and via PPPOE to the Mikrotik. It gets
> the IP address and the DNS set in radius. I know that because it shows
> in the Ubiquiti user interface and I see it in the Mikrotik logs. And
> the Mikrotik does the rate limiting beautifully. We can also browse the
> web through the connection. From a client user perspective it all works.
> But there is one big catch that we are missing.
>
> All outbound connections are using the IP of the Mikrotik router instead
> of the assigned IP address. So the Ubiquiti client equipment has the
> right IP but the connection is using network address translation through
> the router. We need the assigned IP to be accessible through the
> Mikrotik router so it shows as the IP address of the Ubiquiti client
> connection and so we can login to the Ubiquiti client radio from our
> network. Now the Ubiquiti client radio is hidden behind the Mikrotik
> router. What needs to be changed on the router or the radius to fix
> this?
>
> Thanks,
> Mark
>
> _______________________________________________
> Wireless mailing list
> Wireless@wispa.org
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