Fedora Box with TWO NIC's

[John Meagher]

Julian Underwood wrote:

>
> Dear Fedora List,
>
> This message isn't totally "On Topic" but my question refers to a 
> Fedora box which will soon act as a server.  Plus I find the people on 
> this list to be very knowledgable.  My quesiton may be consitered 
> "basic networking" but maybe someone can help me.
>
> I have a Fedora box with two working NIC's:
>
> DSL, static IP:
> (NIC 1)
> ip:168.101.199.6
> nm:255.255.255.248
> gw:168.101.199.5
> dns:168.101.1.3, 168.101.1.9
>
> LAN, has a sonicwall router to Cable modem:
> (NIC 2)
> ip:192.168.0.7
> nm:255.255.255.0
> gw:192.168.0.1
> dns:not needed
>
> With this setup, /nothing/ works. Can't ping anything, can't browse 
> from the box locally, nothing.  However if I remove the gateway on NIC 
> 2 (192.168.0.1), then I can at least browse through NIC 1 and it can 
> be pinged.  However--the LAN interface is still useless, can't ping it.
>
> The reverse works the same.  Remove the GW on NIC 1 (168.101.199.5) 
> and place it on NIC 2 (192.168.0.1) then I can browse through NIC 2 on 
> the Cable modem side, but then the DSL NIC becomes useless (can't ping).
>
> So I am asking, what is the trick to make BOTH interfaces work and if 
> the server needs to go out onto the net, it will by default browse out 
> on the DSL side of things?  I would like to be able to manage the 
> server and provide file services from the LAN side.
>
> I would assume adding a route rule would be in order, but I'm unsure 
> of what to put.  Can anyone help?  TIA,
>
> Julian
>
>
You need to have the default route set to the cable modem and a specific 
route in place for the internal lan, so that for everything except the 
internal lan, it will go out to the cable modem.  Do  a "netstat -nr", 
or a "route print", and let's see what you have.