Add static route with destination

Q. I have 5 IP addresses from my provider, however, I can only access 1. When I try to access the others internally, they time out.

Another scenario: I would like to access a different subnet. (eg 192.168.0.0/24 from 192.168.1.0/24). How can this be done?

A. You need to add the gateway for particular IPs (or IP range) manually, to the routing table. (This exercise assumes that you are running a linux based router).

route -n

Will produce something like this:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0           167.205.111.65   0.0.0.0         UG    100    0        0 eth0
167.205.111.64   0.0.0.0        255.255.255.224 U     0      0        0 eth0
172.17.0.0      0.0.0.0            255.255.255.0   U     0      0        0 vnet0

Assuming you have another IP address 134.107.51.216 you would like to route through 167.205.111.65, here's what to do:

route add -net 134.107.51.216 netmask 255.255.255.255 gw 167.205.111.65

This will produce the following route -n output:

Kernel IP routing table
Destination           Gateway                   Genmask             Flags     Metric Ref Use Iface
0.0.0.0                 167.205.111.65         0.0.0.0                 UG         100 0 0 eth0
167.205.111.64     0.0.0.0                     255.255.255.224   U           0 0 0 eth0
172.17.0.0            0.0.0.0                     255.255.255.0       U           0 0 0 vnet0
134.107.51.216     167.205.111.65         255.255.255.255   UGH       0 0 0 eth0

 If you want to route an entire subnet (eg: 134.107.51.0/24), not just one IP address, you can do the following:

route add -net 134.107.51.0 netmask 255.255.255.0 gw 167.205.111.65