3500 and Toshiba Road Runner Cable modem problems

[t.mercer]

Here's the deal...

I have my Toshiba 1100 cable modem plugged into my 3500XL switch. I have 5 IP's from Time Warner RR. I can only get 4. They claim the switch is either consuming an IP somehow or the MAC address of the switch is getting put into the arp table of the modem and not allowing the extra IP to be released. They lock the ARP table in the modem to however many IP's you have. So if I have 5 IP's the ARP will only allow the first 5 MAC's it sees to get IP's and since my switch is the FIRST one it sees, it gets taken somehow.

Anyone know how to either configure the port to not use a MAC(if it does) or to enable it to where I can get this to work correctly??

Please??

[gwoodyard]

perhaps this will help

On the switch via the console port, try to shut down interface vlan 1

conf t

int vlan 1

shut

end

[bdianni]

Please ask them what five mac addresses are getting put into the arp table on the Toshiba. Then track them back to the devices. If the Toshiba is learning anything from the switch that is not coming from your "int vlan x" management interface, then the Toshiba is breaking 802.1d.