Router cannot get a WAN IP address form some ISP (e4200 v2)

Hello,
I just bought the Cisco e4200 v2 router, I did all the installations as the Cisco connect software instructed me and everything went fine.
After the installation I configured the router on  the WAN settings as (Automatic Configuration - DHCP), like my old router (Linksys WRT54GL) and I saw that my router doesn't get the WAN address from cable modem from my ISP(it stays on 0.0.0.0), it doesn't renew the IP address.
So please how can I fix this issue? This is a bug in the e4200 v2 firmware?

problem solved using the mac clone feature.

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