[CentOS] command problem

Hi all,
I am having problems with commands via Terminal after the upgrade to
centos to release 5.8
How come I did not recognized the ifconfig, route?

below is an excerpt:

# ifconfig
bash: ifconfig: command not found

# route
bash: route: command not found

the kernel version:

# uname -a
Linux localhost.localdomain 2.6.18-308.1.1.el5 #1 SMP Wed Mar 7 04:17:30
EST 2012 i686 i686 i386 GNU/Linux

before the update I had the release 5.5 and I had no problem
can someone help me?

thanks in advance
regards