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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 fa0/0.10 172.16.1.0 as IP NAT outside network for Vlan 10 and fa0/0.20 192.168.1.0 as IP NAT INSIDE network for Vlan 20.

IP route 0.0.0.0 0.0.0.0 172.16.1.1
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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