01-12-2020 10:52 PM
I have a Cisco 1921 I am wanting to use for internet connections at home. My internet service provided is spectrum and I have a modem I want to use for this.
I would like to use G0/0 to go from the back of the modem, to the router. So this would be the public IP address going to the router. Then G0/1 will go to my Cisco switch, and deliver private IP address to the devices, I also need to port forward 5060 for my asterisk server. So here is what I need help with, my cisco class never taught us about connecting these to the outside world.
So, when i configure 'int g0/0' what are the appropriate commands for this interface and what are the appropriate commands for the g0/1 interface for the desired application? What are some other commands I may need to issue for this router to server as a gateway?
01-13-2020 12:42 AM
01-14-2020 12:36 AM - edited 01-14-2020 12:50 AM
Cool! Is the ISP address the public IP address provided by the ISP, or is that the modem address?
(2. ISP Addresses: [IP Address: 192.168.23.11 )?
What is this address?
ip name-server 208.67.222.222
What address would this be
ICT(config)# ip route 0.0.0.0 0.0.0.0 192.168.23.1
01-14-2020 12:41 AM
01-14-2020 01:23 AM
Here is my config does this look okay? I italicized the parts of the config I am not sure of. I updated this as per my topology. I also attached a crude topology to make a bit more of sense of it
Router>en
Router# config t
Router(config)# hostname ICT
ICT(config)# enable password express
ICT(config)# enable secret express
ICT(config)# ip name-server 8.8.8.8 (DNS?)
ICT(config)# line console 0
ICT(config-line)# password express
ICT(config-line)# login
ICT(config-line)# exit
ICT(config)# line vty 0 4
ICT(config-line)# password express
ICT(config-line)# login
ICT(config-line)# exit
ICT(config)# interface Ethernet1/0
ICT(config-if)# Description LAN
ICT(config-if)# ip address 10.0.161.0 255.255.255.0
ICT(config-if)# ip nat inside
ICT(config-if)# no shutdown
ICT(config-if)# exit
ICT(config)# interface FastEthernet0/0
ICT(config-if)# Description Broadband Internet
ICT(config-if)# ip address 192.168.23.11 255.255.255.0 (address of modem?)
ICT(config-if)# ip nat outside
ICT(config-if)# no shutdown
ICT(config-if)# exit
ICT(config)# interface FastEthernet0/0
ICT(config-if)# Description Broadband Internet
ICT(config-if)# ip address 79.79.79.79 255.255.255.0 (Public IP address?)
ICT(config-if)# ip nat outside
ICT(config-if)# no shutdown
ICT(config-if)# exit
ICT(config)# ip nat inside source list 1 interface FastEthernet0/0 overload
ICT(config)# ip route 0.0.0.0 0.0.0.0 192.168.23.1 (address of modem?)
ICT(config)# access-list 1 permit 10.100.10.0 0.0.0.255 (what address is this?)
01-14-2020 02:23 AM
01-14-2020 06:56 AM - edited 01-14-2020 06:58 AM
This modem does pass the public IP. I think it gives it self that address so you can access the web-UI
I have a Motorola MB8600
01-14-2020 07:04 AM
01-18-2020 01:33 AM
Its does not have NAT from what I see. There are not options to disable NAT. I plugged a device into the modem and it gets the public IP address.
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