My first WAN connection is a PPPoE over vLan connection bridged with a DSL modem, I tried to create second WAN connection with another PPPoE account over the same vLan but they are not able to stay connected simultaneously. When second PPPoE client is connected, the first one will be terminated and reconnect again and bring down the other one, the same goes on when I tried to activated both PPPoE clients.

I am wondering whether I can do multiple PPPoE dialup over single vLan bridged with a single modem? Is it limit by my ISP or else?

hi
you can't run multiple pppoe from one interface.
in the one interface just run one pppoe.

is it is possible with vlan