How to use two links based on destination ip address

[admin_2]

I have 192.168.10.0/24 network connected two ethernet port of cisco 3600 router. I have internet link connected to s0. My other brance office is connected to s1. Branch office network is 10.10.10.0/24.

I need to use brance office link for only office to office communication. For internet access i need to use internet link. Trafic flow between 192.168.10.0/24 and 10.10.10.0/24 should happen through S0. and traffic flow from 192.168.10.0/24 and all internet networks should happen through S1. How to achive this.

[#2]

R1 should advertise 192.168.10.0/24 to R2.

R2 should advertise 10.10.10.0/24 to R1 with a specific

routing protocol (RIP, OSPF, EIGRP ...).

Then, on R1 you define a default route to the internet across the serial

line connected to the internet. (ip route 0.0.0.0 255.255.255.255 next hop address).