pppoe problems

hello.
i noticed some problems with pppoe-client discovery and connections through ether interfaces.
either takes too long for service to be discovered or doesnt connect at all
devices hap lite with software 6.40.8
the devices are connected to a modem with pppoe bridge enabled and never had any problems.
can anyone confirm the problem or is just me and the specific modems because the same problem applies to all setups to different clients (they all have speedport entry 2i including me)
when connected doesnt disconnect but when an event occurs (powerfailure or reboot) and pppoe client disconnects is having problems connecting again.

nevermind…
i found out that ISP limited pppoe connections to 1 per device and from that day problems occured to multiple pppoe from different routerboards with delayed connections or no connections at all. is there any way to make pppoe-out with different mac address to trick ISP that connects another device?