First try to set the nexthop to a ip address on the far end of serials like 18.104.22.168. Many times setting the nexthop to the interface has a issue.
From you configuration your policy routing if it worked would send all the traffic from fa 0/0 to router b over serial 0/0/0 and all traffic from fa 0/1 to the internet via serial 0/1/0. This is assuming there are no other subnets behind these ports.
If that is what you are tring to accomplish it may just be the nexthop thing.
from the router im able to ping the next hop 181 and able to reach my public dns as well but when connect my laptop directly to the fa0/1 and try to browse its not happening and if i try to ping external dns its not working. from as i told u from the router im able to ping the external dns.
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