Originally Posted by acid_kewpie
ifdown will wrap ifconfig with the network configuration files, e.g. /etc/sysconfig/network-scripts/ifcfg-eth0 on redhat based systems. Bringing down the interface is fairly simple, but the differences are much more apparent if you comapre ifup with ifconfig
Do you mean to say that the ifdown will run low level utilities such as ifconfig and route to do the job? Since it is just a wrapper, then the internal fucntionality remain same?
Could you also explain the scenario when ifup is used instead of ifconfig up?