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Sharing a broadband connection between two organisations.

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by pysces83

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Where I work owns a 4-story building, we have the top floor and we let the other floors to different organisations.

One organistion has approached my organisation's management and asked could they 'link in' (their word) to our Broadband and we would charge them a small fee. My management have said yes because it's money coming in and we want to support these smaller groups.

There are network points in that room which connect to our patch panel, so that's ok.

The group's PCs run XP home, so they wouldn't be joining our domain. This group is separate from us, they just want to share the broadband (our modem connects to the Firewall, and the Firewall connects to a switch which all our PCs are connected to).

Is there a way of making sure that they can share the Broadband, but not access anything else (e.g our Server) and if one of those PCs got a virus that it wouldn't spread to our PCs? I was thinking of something like a VLAN?

4 replies

by peconet tietokoneet

You will have to make room on your broadband router/switch. Or split the Broadband connection across two routers (if your connection can do this).
So you are on Broadband router "A" and the others (next floor) are on Broadband router "B". Make sure that it is NOT directly connected to your network otherwise you will have trouble.

Keep in mind that your bandwidth will be a lot slower.

by arujammer

Configuring VLAN's on your network will do the job.

Connect their switch to your company switch using tagged ports and let your router or layer3 switch manage the routing to your broadband connection and access list.

Depend on the router you can keep an 'eye' on example how many bandwith the other party is using.

by fleetsys-admin

I will suggest you advise them to get a router with two ethernet interface and connect one of the interface to their switch while the other cnnects to your switch.You can configure their router to do NAT. Also, i assume your broadband access is terminated to a router. Your router, you can create an access-list that can limit their bandwidth and type of traffic that will be coming from the interface of their router connected o your LAN. the LAN IP on the second company router will be the gateway for the second company LAN. Hope this helps

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