Hangs up during reboot/shutdown

[Tapas Ranjan]

Hi :
	Sometimes the pc hangs up during reboot. When the network is poor,
the eth1 seems to be freezed and even typing "ifconfig" also hangs up. So 
rebooting the system due to those problem hangs up the system  at 
"shutting down loopback interfaces" or at "iptables". This happens once in 
6-7 reboots or so.
 	I am using FC2 with 2.6.8-1.521 ( upgraded from 2.6.5-1.358
through "yum" ). Help from experts is needed. 
	
	---Tapas