Cisco 831 to cable modem

Unanswered Question


I'm currently trying to replace a small Linksys router with a Cisco 831. The connection to the Internet is done via a Motorola cable-modem. I've ran the default install wizard of the 831, but the wan-ip stays unfortunately on "not assigned".

In the config, the interface looks like this :

interface Ethernet1

ip address dhcp client-id Ethernet1

ip nat outside

ip virtual-reassembly

duplex auto

no cdp enable

If I unplug the cable from the Cisco 831 and put it back in the wan port of the Linksys, the Linksys automatically gets the auto-ip. -> cable-modem + cable are OK.

Why does the cisco 831 is unable to receive an auto-ip from this cable-modem ?

My ISP says there is no MAC-address filtering.

Thanks in advance for help,

Kind regards,


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