FreeBSD Set a Default Route / Gateway

Task: View / Display FreeBSD Routing Table

Use netstat command with -r option:
$ netstat -r
$ netstat -rn
Output:

Routing tables
Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
default            61.221.xx.yy       UGS         0      247    em1
10                 10.10.110.5        UGS         0       50    em0
10.10.110/26       link#1             UC          0        0    em0
10.10.110.5        00:1b:0d:e6:58:40  UHLW        2        0    em0   1145
61.221.xx.yy/29    link#2             UC          0        0    em1
61.221.xx.yy       00:1b:0d:e6:57:c0  UHLW        2        0    em1   1055
61.221.xx/24       link#2             UC          0        0    em1
127.0.0.1          127.0.0.1          UH          0        0    lo0

The first two line displays default routes.

To just print IPv4 routing table, enter:
# netstat -4 -r -n

To just print IPv6 routing table, enter:
# netstat -6 -r -n

Task: FreeBSD Set a default route

All network packets that cannot be sent according to the previous entries of the routing table are sent through the following default gateway:
# route add default 192.168.1.254

How do I save routing information to a configuration file?

If you reboot FreeBSD box, the routing configuration will be lost i.e. the routing information will not persist. You need to edit /etc/rc.conf file to set defaultroute:
# vi /etc/rc.conf
Set default route by editing defaultrouter variable:
defaultrouter="192.168.1.254"
Save and close the file.

Task: Start and Stop FreeBSD Configured Interfaces

To apply changes to a configuration file, you need to stop and restart the corresponding FreeBSD networking interface. The following command will also update routing information:
# /etc/rc.d/netif restart
# /etc/rc.d/routing restart
OR
# service netif restart
# service routing restart

How can I change or the default gateway from the FreeBSD CLI?

Use the following commands:
### [ delete the default route/gateway ] ###
# route del default
### [ now setup 192.168.1.254 as the default gateway for my FreeBSD box ] ###
route add default 192.168.1.254
Verify it:
# netstat -r -n