Cisco 1800 Router not getting IP from DHCP

[normflow1]

After configuring Interface FastEthernet 0/0 or 0/1 for DHCP as noted below:

Neither receives an IP from my ISP router(192.168.1.1).

#ip address DHCP

#ip nat outside

#no shutdown

#route 0.0.0.0 0.0.0.0 192.168.1.1

I've completing the recommended troubleshooting task but the problem remains. HELP!

[balaji.bandi]

First does your  ISP router offer DHCP service ?

what happends when you connect the laptop to ISP router do you get IP address ?

check is the interface come up ? show interface fas 0/0 ?

if that interface up.

on router enable debug :

debug dhcp detail 
debug ip packet 

[normflow1]

Yes, I'm getting IP assignments form the router for my LapTop and the interface is in UP UP status.  After entering the debug commands I received the following inofmation:

date/time If s=192.168.1.1 (FE 0/1), d=255.255.255.255, ien 328, input featype, virtual fragment reassembly after IPSec Decryption(39), rtype 0, forus FALSE, sendself FALSE, mto 0, fundchk FALSE

Then I get: DHCP Qscan Timeout slecting status linkage DHCP problem.  No allocation possible.

Note: the original request from the router to DHCP is for s=0.0.0.0 dest=0.0.0.0 with flags, forus, sendself, and fndchk set to FALSE.

Now to determine if the problem is in the request from the router or with DHCP.  What do you suggest and thanks for responding so quickly...

[balaji.bandi]

when you connect the laptop what IP have you got?

Do you have any DHCP running on the router, (post-show run from router) - looks for me some config already in the router - as I mentioned post show run (complete)

also confirm below setup :

Internet---ISP--(your DSL router) -- your Cisco router

[MHM Cisco World]

virtual fragment reassembly after IPSec Decryption(39) !!!
why there is IPSec Decrypt ??
can you share complete config ?

[MHM Cisco World]

ask the ISP if they need Client-ID for DHCP