Hi! This the first time that i write in this forum...
I have this problem: i would like that pppoe server assigns public ip address to my cient.
I tried first with proxy-arp solution and then with ospf+pppoe but they don't work.
My isp assigned me a c class x.x.x.0/24 ; my isp gateway is x.x.x.1.
I assigned to my rb public ip x.x.x.3/24 on eth1 (interface linked with isp); i add default gateway x.x.x.1; i put eth1 in proxy-arp mod;
i put the eth2 (interface linked to my private network) in proxy-arp mode; I add an ip pool x.x.x.5-x.x.x.254; i setup pppoe profile1 in this way:
local address:x.x.x.3
remote address:pool1
in pppoe server:
interface:eth2
profile:profile1
and i test with an user; pppoe sever assigns public ip to client but the only ip that i can ping is the rb (x.x.x.3).
Where i'm wrong?

I resolved!
I asked to my isp to make a p2p from his server to mine.
Then i used ospf+pppoe solution and it's work fine.
Bye!