Can't add route to host

[Dexuser]

I got folling sitation. Machine has multiply network cards and route table are

Destination Gateway Flags Refs Interface Pmtu
127.0.0.1 127.0.0.1 UH 0 lo0 4136
192.2.1.23 192.2.1.23 UH 0 lan5 4136
10.168.0.31 10.168.0.31 UH 0 lan0:1 4136
10.168.0.23 10.168.0.23 UH 0 lan0 4136
10.168.0.0 10.168.0.23 U 3 lan0 1500
10.168.0.0 10.168.0.31 U 3 lan0:1 1500
127.0.0.0 127.0.0.1 U 0 lo0 0
default 10.168.0.1 UG 0 lan0 0

I connect the some host with crossover cable via new ethernet card with ip 172.16.0.3/255.255.0.0 and run following command

route add 172.16.0.2 172.16.0.3 0
And new route table becomes

Destination Gateway Flags Refs Interface Pmtu
127.0.0.1 127.0.0.1 UH 0 lo0 4136
172.16.0.3 172.16.0.3 UH 0 lan2 4136
192.2.1.23 192.2.1.23 UH 0 lan5 4136
10.168.0.31 10.168.0.31 UH 0 lan0:1 4136
10.168.0.23 10.168.0.23 UH 0 lan0 4136
172.16.0.2 172.16.0.3 UH 0 lan2 0
10.168.0.0 10.168.0.23 U 3 lan0 1500
10.168.0.0 10.168.0.31 U 3 lan0:1 1500
127.0.0.0 127.0.0.1 U 0 lo0 0
default 10.168.0.1 UG 0 lan0 0

But when I trying to traceroute I got folowing warning
traceroute: Warning: Multiple interfaces found; using 10.168.0.31 @ lan0:1
traceroute to 172.16.0.2 (172.16.0.2), 30 hops max, 40 byte packets

And I could not send packets via 172.16.0.3 interface.

Wnat did I do wrong ?

[TTr · Accepted solution]

You did not do anything wrong. The traceroute commnad picks one of the IPs of the default lan0 and tries to find a route to the destination.

You should use the -i option in traceroute. Or forget about traceroute and see if you can connect to the crossover host via whatever and then verify the connection with netstat on either side.

[Jeeshan]

try like this

#route add net 172.16.0.2 netmask 255.255.0.0 172.16.0.3 1