OS X Mavericks :: Selective Routing Causing (out Of Memory)

I've got two interfaces, in this order: 

1. Wi-Fi connection to Apple time capsule that links to the internet - 10.0.1.9 

2. LAN connection to ISP that links to the internet -  10.0.2.250 

This works perfectly well, however, I would like to rout traffic through the second link, not just have it as a fail-over. 

So, I use the route command, like this: route -n add -host 197.242.144.171 10.0.2.250route -n add -host 197.242.144.175 10.0.2.250route -n add -host 173.194.41.182 10.0.2.250 

This doesn't give any errors and a netstat -nr shows

197.242.144.171    10.0.2.250         UGHS            0        1     en0197.242.144.175    10.0.2.250         UGHS            0        0     en0173.194.41.182     10.0.2.250         UGHS            0       12     en0 

If, though, I try trace route, this is what I get: traceroute 197.242.144.175traceroute to 197.242.144.175 (197.242.144.175), 64 hops max, 52 byte packetstraceroute: sendto: Cannot allocate memory1 traceroute: wrote 197.242.144.175 52 chars, ret=-1 

It looks as if, somehow, the route command is corrupting the normal routin