Static route in RHEL 6

I have a box that's on two subnets, both fully routable within the network. I would like to add routing so that all traffic goes to the first adapter, with the exception of a handful of addresses.
I have been able to add the static routes for the individual machines and can get to the secondary adapter, but then when you try to get to the first adapter from one of those machines, then the ping fails. I want to do this for putting certain traffic ie cluster traffic through certain interfaces, but everything needs to be routable within the network.

bond0 --> 10.10.10.10

bond1 --> 10.20.10.10

Ping from another machine on 10.10.10.0 to 10.10.10.10 is good

Ping from another machine on 10.10.10.0 to 10.20.10.10 is bad

Ping from another machine on 10.20.10.0 to 10.10.10.10 is bad

Ping from another machine on 10.20.10.0 to 10.20.10.10 is good

Edit: It looks like I might need to tune something in the arp tunables, but so far arp_ingore/arp_annouce/arp_filter haven't produced any results, but it does sounds like interface base vs host base arp might be the issue.