Config help on Geek's home network

[WOoldakere]

Hey all, this is my first post to Cisco community, although I have been reading on it for years.

I am looking to make my home network the best I can with everything I have. To start I have done up a basic diagram below showing the major components of my network and attached it below.

I am looking for some basic setup configs and or best recommendations by anyone willing to contribute. I

 ran into the problem few days ago when I had gotten a new cable modem from my provider, and did not realize at the time, that the modem is basically config free. It has no IP for routing purposes, only for diagnosis. I had used a 2811 router for a while but it was of course a bottle neck as it had only 100m connection while the rest of the devices were Gig ports, and on a home network it seemed a bit overboard.

My overall intent is to place the C3560CG between the modem the C3750G (my primary switch) to act as a router. I simply need to set one port as the "Gateway" for all internet traffic to flow through. Problem is that the cable modem has no IP on the ethernet port and the external IP is dynamic. 

I currently have no VLANs configed other than VLAN 1 which I use for SSH access. The two other switches are in my home and in my neighbor's home where there are several hard line endpoint devices (ie PC, TV, printers) and a wireless access points where.

DHCP is currently on a cheap linksys router sitting the same place I want to put the C3560CG. I need help setting that switch configs so it will push DHCP and will route to the cable modem. Need to know how the Pool should be configed for IPV4&6 if possible, and where. I think I need helper IPs for the other two switches too?  

If you need to know more to give help I will be happy to give (most) info you ask.

WS-C3750G-24PS	c3750-ipbasek9-mz.150-2.SE10a
WS-C3560G-24PS	c3560-ipbasek9-mz.150-2.SE10a
WS-C3560CG-8PC-S	c3560c405ex-universalk9-mz.152-2.E6

If this is posted in the wrong community I can move it or assume admin will.

Thanks for any help

SGT Oldy

US Army Signal Corp 

[Dennis Mink]

Oldy,

keep it as simple as you can, keep VLAN1 and make sure it exists on all switches, use only one subnet and put for instance IP addres 192.168.2.254 on your cable modem/router and on all your clients that need internet access, set 192.168.2.254 as the default gateway.

strictly speaking is you use only one VLAN, you would not need a trunk between switches either.

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[WOoldakere]

Dennis,

               Thanks for the reply; however, that solution will not work. The modem is a SB6183 cable modem. The cable modem is strictly a modem and not a router. It is simply (frustratingly) plug-and-play, no configs possible. The IP that you get if you plug into a DHCP port is an external IP and it is Dynamic as well. I know I could do this whole process with a router, but want to set up with a switch to eliminate the bottle neck. If i could set the "Gateway" as a port not an IP that would work.

               I am wondering if I could somehow set the DHCP pool gateway to a vlan and put that vlan only on the port going to the cable modem? Not sure how to do this with what I have vs having to get more hardware...

[Dennis Mink]

I mean theoretically it should be possible to have the cable router dish out DHCP addresses for the whole VLAN that you create across the switches. 

but still I think your cable modem will restrict anything you are trying to do. 

try this:

https://supportforums.cisco.com/document/27801/configuring-router-eth-int-or-svi-be-dhcp-clien

and then on the switch that receives the DHCP address, NAT all that is behind it against that DHCP IP address.  It's just a theory.

Please rate if useful