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Sharing files between 2 priv networks w/ 2 WAN links

brianboru

Member
Long story, but I've been blessed with both a 3mb cable connection and a T1 connection. I plan to use the T1 almost exclusively for a single PC which will be transferring data most of the day long, in both directions.

The majority of the other PCs including printers, etc will be based off of the cable modem lan. I'd like to be able to share the files between the two networks though, and I'm looking for best ways to get this done. Right now, most of the PCs have single NIC cards, but adding more isn't a problem. Another option is firewire - I've connected two of the PCs one night when I was playing around and they worked fine, but it did turn off my other default connections. No doubt a problem with static or default routes at the time. Didn't really pursue it.

Anyway, any ideas for the best way to get this done? I don't need to share or load balance the connection as I said, as really only one PC will be using the T1 most of the time.

Is this as simple as assigning a single static LAN with two gateways? ie, all computers could use 10.0.0.x and then gateway 1 is 10.0.0.1 (cable) and gateway 2 is 10.0.0.2 (T1)? In that case, each computer would then only use a single NIC and IP. As long as DHCP wasn't enabled, would this work? Seems too simple, so I expect it wouldn't be that easy.

Anyway, any and all advice is welcome here.

Oh and two last points:
1) I will transfer a lot of data across that T1 - I need to make sure that none of the bandwidth goes across the cable modem
2) In the next month, I will be setting up a site-to-site VPN to another location (static IP) probably using the cable modem. While the static T1 may make more sense, there won't be a lot of free bandwidth, so I'd rather take advantage of the cable connection.



 
It should work as easy as what you described, using different default gateways. The subnet mask will determine whether the packet leaves the local subnet, and if it needs to leave, it will go out what ever gateway you tell it.

You can even still use DHCP if you want. If the cable connection is the primary access for the majority of the computers, they can use the DHCP that hands out the cable gateway. Just static set the single computer to use the T1 gateway.
 
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