Configuration issues with openwrt device as a client

Installing and Using OpenWrt Network and Wireless Configuration
41

ok thanks, I will give that a try

42

I solved the problem by adding a couple of routes between the two subnets
in the car I set this routes
ip route add 10.249.1.0/24 via 10.249.31.251 dev eth0
in the lane
ip route add 10.249.31.0/24 via 10.249.1.36 dev br-lan

43

Good to hear it solved...

Yes, the problem is the subnet is different and they don't talk each other unless you make a static route or make all in the same subnet.