Ubuntu route add command guide for a new user. The route add command actually is one of route command options used to modify a routing table. The route add option can create a new route, add new network, modify current routing table, and add new gateway.
This is the online help available with route command. You can view this help with route --help command.
Usage:
route [-nNvee] [-FC] [] List kernel routing tables
route [-v] [-FC] {add|del|flush}... Modify routing table for AF.
route {-h|--help} [] Detailed usage syntax for specified AF.
route {-V|--version} Display version/author and exit.
-v, --verbose be verbose
-n, --numeric don't resolve names
-e, --extend display other/more information
-F, --fib display Forwarding Information Base (default)
-C, --cache display routing cache instead of FIB=Use '
-A' or '-- ';
default: inet
List of possible address families (which support routing):
inet (DARPA Internet) inet6 (IPv6) ax25 (AMPR AX.25)netrom (AMPR NET/ROM)
ipx (Novell IPX) ddp (Appletalk DDP)x25 (CCITT X.25)
This is the description:
DESCRIPTION
Route manipulates the kernel's IP routing tables. Its primary use is
to set up static routes to specific hosts or networks via an interface
after it has been configured with the ifconfig(8) program.
When the add or del options are used, route modifies the routing
tables. Without these options, route displays the current contents of
the routing tables.
The route command with no option will print the routing table. See an example below:
luzar@ubuntu:~$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
localnet * 255.255.255.0 U 0 0 0 eth0
default mygateway1.ar7 0.0.0.0 UG 100 0 0 eth0
luzar@ubuntu:~$
Here is an example of Ubuntu route add command to create a new network route:
root@ubuntu:~# luzar@ubuntu:~$ sudo route add -net 10.21.35.0 netmask
255.255.255.0 dev eth0
[sudo] password for luzar:
luzar@ubuntu:~$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
localnet * 255.255.255.0 U 0 0 0 eth0
10.21.35.0 * 255.255.255.0 U 0 0 0 eth0
default mygateway1.ar7 0.0.0.0 UG 100 0 0 eth0
luzar@ubuntu:~$
You can see the new route is added in the routing table above.
