My Debian box can't connect Internet

[Stephen Liu <satimis@icare.com.hk>]

Hi folks,

My Debian box can't connect Internet, Broadband connected.  

# ifconfig
showed connecting ISP

I played around with following files without a solution;

# cat /etc/network/ifstate 
lo=lo
eth0=eth0

# cat /etc/network/interfaces 
# /etc/network/interfaces -- configuration
file for ifup(8), ifdown(8) 
# The loopback interface 
auto lo 
iface lo inet loopback 
# The first network card - this entry was created during the Debian
installationauto eth0
iface eth0 inet dhcp

# cat /etc/network/spoof-protect
LOCAL_IPS="127.0.0.1/8"
LOCAL_IFACES="eth0 eth1 ppp0"
(Remark: having tried;
#LOCAL_IPS="127.0.0.1/8"
#LOCAL_IFACES="eth0 eth1 ppp0"
LOCAL_IFACES="eth0 ppp0"

After each change made
# /etc/init.d/networking restart 
Reconfiguring network interfaces: done)

# cat /etc/network/interfaces.dpkg-new 
# (no output, an empty file)

# cat /etc/network/options 
ip_forward=no 
spoofprotect=yes
syncookies=no
(having tried;
ip_forward=yes
spoofprotect=no
syncookies=yes)

# ping -c 3 www.yahoo.com
ping: unknown host www.yahoo.com

# /etc/init.d/iptables stop
Aborting iptables load: unknown ruleset, "inactive".

iptables has not been configured yet

Kindly advise how to fix the problem.

Thanks in advance.

B.R.
Stephen Liu