How to change default source address in FreeBSD 10?

From /etc/rc.conf
ifconfig_vtnet0=»inet 10.0.5.2 netmask 255.255.255.0″
ifconfig_vtnet0_alias0=»inet 131.0.232.2 netmask 255.255.255.255″
defaultrouter=»10.0.5.1 -ifa 131.0.232.2″

SRC-address changed 10.0.5.2 from 131.0.232.2