This question isn't really too much to do with pfsense (However I run run 2 pfsense boxes!)

I'm trying to add a route in a linux machine (which is using busybox).

i wish to add a route to a 10.87.96.0/24 network.

The hops should be as follows:

10.87.1.10 (localhost)
10.87.1.1 (default gateway which has a IPSEC tunnel)
10.87.0.1 (Other end of IPSEC tunnel)
10.87.0.29 (A router which knows how to get to my required network_
10.87.96.0/24 (My required network I wish to be able to reach)

My routing table looks like this:
Destination    Gateway        Genmask        Flags Metric Ref    Use Iface
10.87.1.0      *              255.255.255.0  U    0      0        0 eth0
default        10.87.1.1      0.0.0.0        UG    0      0        0 eth0

However every time I try and:
route add -net 10.87.96.0 netmask 255.255.255.0 gw 10.87.0.1

I get route:
SIOC[ADD|DEL]RT: Network is unreachable

Any ideas?

Thanks