[K12OSN] Networking configuration

[Jeremy Schubert]

Do I need a cross over cable between eth1 and my cable modem or just a regular cable?

----- Original Message -----
From: John Lucas <mrjohnlucas at gmail.com>
Date: Monday, June 16, 2008 5:44 pm
Subject: Re: [K12OSN] Networking configuration
To: "Support list for open source software in schools." <k12osn at redhat.com>

> Jeremy Schubert wrote:
> > I used to have three clients connected to by dlink device that 
> acts as a 
> > switch, dhcp server and proxy server (shares the internet, but 
> I guess 
> > not exactly a proxy server, anyway...)  Client computers 
> gateway is set 
> > to the ip of the dlink device.   The dlink device is 
> connected to the 
> > cable modem.
> > 
> >  
> > 
> > Now I have introduced my CentOS ltsp server.  Currently I 
> have eth0 and 
> > eth1 plugged into the dlink device.
> > 
> >  
> > 
> > So, do I have to plug eth0 into my cable modem and eth1 into 
> my switch?  
> > And then the gateway for my client computers would be the ltsp 
> server 
> > instead of the dlink device? 
> > 
> 
> You shouldn't have both NICs on the same network segment 
> (subnet), it 
> will not work.
> 
> As I recall the client side of LTSP is on eth0 by default, so 
> eth1 would 
> go on the cable modem and eth0 goes on the LAN side (not WAN 
> side) of 
> the Dlink. Your clients also go on the LAN side of the DLink. 
> This 
> assumes you want to use the LTSP server as your router/firewall 
> instead 
> of the DLink. If this is the case, then be sure to *turn off* 
> DHCP on 
> the DLink and let the LTSP server handle that task too. The WAN 
> side of 
> the DLink will not be used. The client's default route would 
> point to 
> the LTSP server (be sure to turn on packet forwarding if you 
> have PCs 
> that need to pass traffic through the server).
> 
> The other way to do this is to run a single NIC LTSP server 
> (only eth0) 
> and plug the LTSP server and all clients onto the DLink LAN 
> side, turn 
> off DHCP on the DLink but continue to use the DLink as your 
> router/firewall with the WAN side connected to the cable modem. 
> In this 
> scenario, the DLink would be the default route for all clients 
> (including the LTSP server).
> 
> > Also, during the ltsp install, the eth0 was designated 
> x.x.x.254 and 
> > eth1 dhcp.  Currently I connect to the server using putty 
> (ssh).  Is 
> > there a cmd line I can use to change the eth1 to static and 
> modify both 
> > cards address?
> > 
> 
> You can usually change the network configuration with a GUI too. 
> I use 
> KDE and installed the KDE admin tools, which adds an 
> "Administration" 
> item to the main menu. The exact setup depends on your ISP. The 
> single 
> NIC setup wouldn't require changing eth1, because there would be 
> no eth1.
> 
> 
> -- 
>          "History 
> doesn't repeat itself; at best it rhymes."
>                          - Mark Twain
> 
> | John 
> Lucas                MrJohnLucas at gmail.com               |
> | St. Thomas, VI 00802      
> http://mrjohnlucas.googlepages.com/ |
> | 18.3°N, 
> 65°W              AST (UTC-4)                         |
> 
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