WRT300N - Suddenly disconnected from internet

I have WRT300N which was configured and working well in a DSL connection - without login/password.
Suddenly from 15 days back, i lost the connection.  The IP address  is assigned to my computer and wifi equipments (198.162.1.1 ...), as well as the Internet Proxy Address is set for the DSL connection as (198.162.323.123).  But still I am not able to connect to internet with any of the equipments (PC, laptop, Ipod touch, Iphone or wifi skype phone).
Note that when i tried the internet directly to my laptop/pc, it works without any issue.
I tried to reset the router setting as well as downloaded the software from Cisco and installed in the router.  But still i am not able to connect to internet.
Can anyone suggest what do further?
Thanks.
Solved!
Go to Solution.

The status is as below:
Connection Type:       Automatic Configuration - DHCP             
                  Internet IP Address:      192.168.1.5           
                Subnet Mask:      255.255.255.0           
                Default Gateway:      192.168.1.1           
                  DNS1:      192.168.1.1           
                  DNS2:                
                  DNS3:                
                  MTU:      1500           
                  DHCP Lease Time:      4 Hour
The IP allocated to my computer is 192.168.1.100

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