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Router Connect to T1 Shared by Mult. Co.

By NAL ·
Need to connect to a T1 shared by multiple companies within a single building. My understanding is that there is no hardware in place at the T1 to segregate the different companies within the building, and we want our LAN to be separate and secure. Was told by building IT that a router with DHCP enabled was necessary, but was not given any router settings.

Have a Linksys router in place; PCs (WinXP Pro) can see each other, but have no internet access. Played with the router settings a bit without success. Would appreciate any suggestions - thanks!

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by BudTheGrey In reply to Router Connect to T1 Shar ...

I'll make the presumption that at this point the only interest you have in the T1 is internet access for your users.

That T1 is spitting out Ethernet somewhere, and some some range of IP addresses. Since this is a shared connection, it's probably safe to asume that the T1 router is connected to a "top level" switch, and the connection flows down to the various companies when they connect their networks to that switch.

You are on the right track using the Linksys router. The LinkSys will need to have it's "wan" side connected to the T1 switch. If there's a DHCP server on the T1 side, you should be good to go. If not, maybe what the IT guy meant was that you had to have DHCP on the *inside* of your network, and that the T1 (WAN) side of the router will be using a fixed IP & netmask.

Hope this helps

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by CG IT In reply to Router Connect to T1 Shar ...

I would get a Cisco 1700 series access router or a PIX 501 access router/firewall. As Bud said, all the tech will do is assign a port on the campus switch to your company and run an ethernet line from the switch to your suite. To ensure security, you'll need something between the campus switch and your suite. With a PIX 501, the building tech can put it in the rack in their equipment room or with a 1700, put it in your office suite. I wouldn't go with a consumer level router [linksys, netgear, etc ] unless absolutely necessary e.g. cost constraints. Your LAN setup also needs to be taken in consideration. If your LAN is a "Workgroup" and you have file and folder sharing enabled, its a security leak. Patches, fixes, and XP SP2 firewall aside, a Workgroup LAN is not as secure as a domain based one. Recommend firewalls on all computers [layered defense] in addition to the consumer level router firewall and NTFS on all computers with power user or limited user accounts for all users.

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by CG IT In reply to

The DHCP the tech was refering to is for your LAN and you'll need NAT. You'll get 1 IP address as your public one [ WAN ] from the campus switch [VLAN] so for users in your office to share that, you'll need to run NAT. DHCP on your LAN isn't necessary if your run NAT on the router. I would turn OFF RIP and disable SNMP on the router, [added precaution, change the public and private SNMP passwords].

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