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Help with 2620xm home network with cable modem SB4100

By CiscoPractitioner ·
Hi everyone,

I'm trying to set up a home network with Cisco 2620xm (1fa) with cable modem SB4100 through a 2950 switch, but can't get it to work.

I set up 2 Vlans.. Vlan 10 fa port 2 for cable modem, Vlan 20 as access ports for the rest. Port 1 is set as trunk which connects to router.

Router has two sub interfaces fa0/0.10 as IP NAT outside network for Vlan 10 and fa0/0.20 as IP NAT INSIDE network for Vlan 20.

IP route
ACL was set as standard to permitting the networks and Nat is linked with ACL and set to overload.

There is a catch in which my ISP uses DHCP assigned ip, however, it hasn't changed for a very long time.

There are definite faults in my setup but I don't know exactly what it is or if it's even workable because I read on other forums that a 'NAT on a stick' is needed with a loopback address.

Also there is the problem with the cable modem with one max mac, so I switched CDP, Keepalives, STP off on port 2.

Can someone please point me to the right direction?

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