Whats is the way to split , say smtp and ftp traffic to different Service providers with different AS Nos using BGP ? The split needs to be in both directions and also fail over to the second provider if the primary path fails ?
why have u entered the ip helper on the serial interface of your LAN router. It is not required as the remore router is the one which needs the helper. try removing that line frm your main office router.
from your description its clear that NAT is working but stops. This is in all probablity an issue of how the NAT tables clearance timer is set on your router. If the timer is set to never it may be hogging your memory and preventing new transaltions ...
