The network commands that we are so used to on unix/linux do not come by default for iOS 3 or above. You have to install the network-cmds package by Telesphoro Tangelo.
The commands supported are arp, ifconfig, netstat, route, traceroute. Kudos goes out to Telesphoro Tangelo for developing it and thelatinist for guiding me to it – http://forums.macrumors.com/showthread.php?t=962231
Caluadewa Tharindu Mathew's Website 
Thanks for this nice article. here is my list of top 10 basic networking command in unix I would rather say very useful and practical unix linux networking commands :)ThanksJavin PaulFIX Protocol tutorial