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New Member

dhcp

Hello how are you all doing? Hope all is well. I hope I am at the right place for this question.

I work for roadrunner highspeed online help desk. Our residential customers go online via our cable modems which issue a dynamic ip address.

Is there any way of determining what the cable modems ip address is, given the leased dynamic address.

The reason I ask is because I have come across instances where some individuals configure a dynamic ip statically thereby creating problems for those who try to lease that particular dynamic ip.

Thank you.

Uzo.I

2 REPLIES
Cisco Employee

Re: dhcp

You can check the MAC address and router port that's associated with the IP address with the "show arp" or "show ip arp" command on the router.

You'll need a table that shows each customer's cable modem MAC addr to identify it. Sometimes the MAC address is the same as the box serial#.

Hope it helps.

Regards,

Alexandre

New Member

Re: dhcp

Thanks Alexandre

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