Does anyone have a 1605 cable modem config?

[heinemanj]

Hello,

I have a 1605 router and because it has two ethernet ports I would like to setup the router between the cable modem and my switch. I would assume you need to configure NAT and NAT pooling (DHCP). Does anyone have a running config that they are willing to send me or let me see? Thanks for your help!

-Jon

 

[netmediasystems]

Hey Jon -

The config for a cable modem is quite simple, depending on what you are trying to do behind the router. Is the Ip address from the ISP dynamic? If so, here is what the interface 1(WAN side) should look like:

Interface Ethernet1
ip address dhcp
ip nat outside
no cdp enable
arp timeout 1500 ( this supposedly help with any hesitation when the lease expires).

Interface Ethernet0
ip address (private) 10.10.10.1 255.255.255.0 (example)
ip nat inside
no cdp enable

For the ip route you can put 0.0.0.0 0.0.0.0 ethernet1, but if you can get the ISP gateway that would be preferred. To get the gateway, if you dont have it, you can plug your pc directly into the modem and do a ipconfig on a windows machine.

For the PAT config:

ip nat inside source list 101 interface ethernet1 overload


Global access-list:

access-list 101 permit ip (private scheme)10.10.10.0 0.0.0.255 any.

If you have a IOS version that supports CBAC you can configure that as well for the firewall feature set.

brian

 

[heinemanj]

Brian,

Thanks for the sample config. I will have to try it this weekend! Thanks again!

-jon