Firstly, you dont want both of your lan cards sitting on the same vlan as this could just provide more confusion than it is worth. Use either eth0 or eth1 and disable the other one OR set the second one to a different vlan, eg. 192.168.11.1, and have iptables redirect traffic between them if necessary.
Secondly, when ppp comes up the routing table should automatically be changed to make ppp0 the gateway to any vlan that is not 192.168.10
Packets to say Google (66.249.87.99) will be redirected to ppp0 rather than 192.168.10.70.
Use the route command in a konsole/terminal to display the routing table when you bring up ppp0.
ThePhantom
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