PPP connection gateway

Hi,

I tried to set up a mikrotik PPP server to work with FreeRadius AAA. Using the radius framed-pool attribute i instructed users to obtain an ip address from routers ip pool. but unlike mikrotik accounting and userman, I found no way to specify an ip address for the router itself( pppoe-in) when a connection establishes. does anybody know how to do it? :confused: