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Sub Network within an existing network?

I am working out of a friend's house who has their own network. The current set up is: cable modem goes to my friend's router (an Airport) then a cat5 plugs into the wall jack to supply the wired network through out the house. I am in a separate part of the house away from the current router setup.

What I want to do is plug my router into the wall and have my own sub network where i can use my own DHCP server for my devices.

How can I do this without his DHCP server trying to compete with mine for addressing?

I hope that makes sense!

Thanks
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Jonathong
Asked:
Jonathong
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1 Solution
 
pony10usCommented:
How is the rest of the house supplied?  Is there a switch somewhere in the home?
 
Existing:  cable modem to router to switch to rest of building

If the cable modem has multiple ports (most do now)

New: cable modem to router 1 and router 2 that each go to a switch that goes to different locations of building

That should isolate the two segments almost completly

A very basic drawing is attached.
ee-multi.vsd
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JonathongAuthor Commented:
Hey Pony,

The coax comes from the wall in their office, into the modem (only one ethernet port and one USB port on back), which then connects to their Airport (router). Then I have an ethernet cable going from the Airport to the network jack in the wall which goes to a switch in the data closet located in the laundry room. That switch distributes to the rest of the wired jacks in the house, including my office.
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pony10usCommented:
I see - I missed that it was a cable modem and not a DSL modem - my mistake.  DSL comes with 4-6 ethernet ports usually now.

Is the switch a managed switch?

Answer: yes?

Create 2 VLAN's on the switch, one for the port that goes to your office and one for the ports to the rest of the house.

This solution will isolate your network from the rest of the house.

You could put your router after the switch however it isn't necessary.
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JonathongAuthor Commented:
How do I know if its managed, and if it is how do I set up the vlan?

Thank you!
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JonathongAuthor Commented:
Its actually a netgear ProSafe VPN Firewall. Model FVS318

If at all possible, i dont want to change any thing on his gear.
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pony10usCommented:
Atually, you should be able to just plug in your router and it will get it's address through DHCP on his network. It will then supply your equipment with it's assigned DHCP string which you can manipulate.

The issue with this set up is that once your traffic leaves your router it will be in the same network as the rest of the building.  

It really comes down to how secure you need to make your network
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JonathongAuthor Commented:
Oh really? His router will assign my router an address, but nothing past my router?


Im not concerned about security at all.
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Craig BeckCommented:
Yep, pony10us is correct.  Just plug in your router and it will get an IP address from the Airport.  It won't give addresses to anything on your side of the router.
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JonathongAuthor Commented:
Thank you very much for your time!
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