Create a routing entry to a network interface

Hi all,
I want to create a host routing entry that points to an interface, e.g. I want that all traffic to address 1.2.3.4 goes through interface 1.
"route add 1.2.3.4 IF 1" does not work, route requires a netmask and a gateway. This is something I don't have. A single host has no netmask and I don't have a gateway on the other end of the interface.

Any suggestions?

To illustrate what I want, here is an example from Linux:

Code:

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orbit-linux:/home/orbit # netstat -rn
Kernel IP Routentabelle
Ziel            Router          Genmask        Flags  MSS Fenster irtt Iface
10.1.25.0      0.0.0.0        255.255.255.0  U        0 0          0 eth0
0.0.0.0        10.1.25.1      0.0.0.0        UG        0 0          0 eth0
orbit-linux:/home/orbit # route add -host 1.2.3.4 dev eth0
orbit-linux:/home/orbit # netstat -rn
Kernel IP Routentabelle
Ziel            Router          Genmask        Flags  MSS Fenster irtt Iface
1.2.3.4        0.0.0.0        255.255.255.255 UH        0 0          0 eth0
10.1.25.0      0.0.0.0        255.255.255.0  U        0 0          0 eth0
0.0.0.0        10.1.25.1      0.0.0.0        UG        0 0          0 eth0

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