simple routing question

drkstorm · Tux's lil' helper Joined: 22 Apr 2004 Posts: 118

I will soon have two networks, connected by a T-1, I want to route between the two but I am not sure how to set this up so as to minimize traffic over the T-1 link, here is what i am thinking

network 1:

internet -> server | eth0 (real world ip) & eth1 (192.168.1.1) | -> private network (192.168.1.x)

network 2:

T-1 to above network -> server | eth0 (????) & eth1 (192.168.2.1) | -> private network (192.168.2.x)

my question is, how to I connect all of this, do I connect the T-1 uplink into a switch on network one, and set my current gateway (192.168.1.1) to route all requests to 192.168.2.1 and then on network 2 configure the server's eth0 with 192.168.1.x?

I'm not too sure what should be connected where, i want two subnets and I have two servers each with two nics.... any ideas?

grimm26 · Posted: Thu Jul 01, 2004 4:53 pm Post subject:

My first question is why do you need two separate subnets at home? Well, let's look at the issue anyway.

First of all, routing traffic between your two private subnets will generate no traffic over the T1 since the T1 leads to the internet - unless you want to route between them using their public IPs. Your switch should also know not to route 192.168/16.

There are additional questions. How are you handling NAT? Is your switch doing it?

Unless you have another public IP, you can't plug server2 into your switch with the T1 uplink - unless it is a managed switch, I suppose. What do you plkan on plugging eth0 from server2 into?
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drkstorm · Tux's lil' helper Joined: 22 Apr 2004 Posts: 118

let me clarify, the T-1 is a peer to peer connecting two buildings, internet is provided by a wireless T-1, this isnt a home setup. Also my switches are not managed

here is another view

T1 #1(internet) <--> Server #1<-->Switch #1<-->T1 #2(peer-2-peer)<-->server #2<-->switch #2

Something is not right with this setup, the peer to peer T-1 will only be routing data between 192.168.1.x and 192.168.2.x networks. I just don't know what to hook up where, do I connect one end of the T1 into the switch, and the other into the server having it act as a router between 192.168.1.x and 192.168.2.x, do I connect each end into a server, if so what IP do I use for each interface

Its a simple setup, I've just never done it before

Houdini · Posted: Thu Jul 01, 2004 10:12 pm Post subject:

I would do something like:

Lajasha · Posted: Fri Jul 02, 2004 12:02 am Post subject:

drkstorm · Tux's lil' helper Joined: 22 Apr 2004 Posts: 118

Thanks for your help, I need to make sure that traffic on the peer to peer T-1 has minimal overhead, placing the T-1 on it's own "backbone" subnet may make the best use, it would prevent the other 2 subnets 192.168.2.x and 192.168.3.x from broadcasting, also my switches are unmanaged and do not have IP assignable ports for creating vlans, they are basic $300 24-port switches.

let me see if i can get this straight:

Lajasha · Posted: Fri Jul 02, 2004 6:37 pm Post subject:

You can use that setup as long as the servers are only routers as they will be proccessing all the traffic and could get quite busy doing so. The setup you have should work and should be achieveable using routing tables.

[EDIT] You'll probly have to use IP Masquerading also.
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drkstorm · Tux's lil' helper Joined: 22 Apr 2004 Posts: 118

the two networks are very small, only 20 -30 comps, so i will use server one as a web server as well...

Do you know any good how-tos for setting up routing tables, i've always used gshield's firewall router script, but for routing over the p2p T1 i don't want to have any firewalling at all, just straight routing