questions on eoip tunnels

lets say i have to networks R1 R2

now R1 and R2 connect to net via pppoe connection


now i bridge out R1 and R2

adn create an eoip tunnel that connects R1 and R2

can i brige it all under one network mask 192.168.1.0/24

i tryed it and it works but i get many tx/rx errors
can any one give me an idea on what to do?