[linux-help] Re: Can't set up network

[Jonathan Hall <jonhall@xxxxxxxxxxxx>]

Why do you have two NICs if you're only using one?

Naturally, the IP address of eth1 will not be pingable thru eth0 unless the
Linux box is set up as a gateway *AND* the other boxes know to use it as a
gateway.

Imagine a city block with three houses, each with their own respective
addresses.... 100 Somestreet, 101 Somestreet and 102 Somestreet.

One of the houses has a backdoor leading to the alleyway.... address 200
Otherstreet.

Someone trying to find 200 Otherstreet when they're driving down Somestreet
will get lost.

It sounds like your Linux box has two addresses... the one from RR
(24.x.x.x) and a private one on eth1 (192.x.x.x).  The reason the other
boxes cannot ping the 192.x.x.x address is b/c they're on the wrong
"street"... or, in real-world terms, they're on a different physical
network.

You either need to give eth0 the 192.x.x.x address, *OR* (usually
preferable), plug eth1 into the hub, and use the Linux box as a gateway to
the 'net (I assume this is what you're trying to accomplish in the longrun
anyway).

Let me know if I've totally confused you by now... :-)



On Thu, Jul 13, 2000 at 09:14:14PM -0500, Bruce Bales wrote:
>     I'm trying to set up a network with a windows box and two linux boxes.
> Have the three boxes and a cable modem hooked to a hub.  Linux box #1 has two
> ethernet cards (one isa and one pci, but the PCI cable is not hooked up yet).
> I can access the internet with Netscape from all three boxes and can ping the
> cable modem from each.  But I can't ping any box from another.
> 
> When I boot, the isa board (eth0) in box #1 and box #2 set up ifconfig with
> "inet addr 24.92.X.X" or something close (the two linux box addresses are not
> the same).  Road runner is 24.94.195.32. If I ping either box to its own
> 24.92.X.X number, it takes about .5ms to return - about the same as
> 127.0.0.1. If I ping the other box's 24.92.X.X number it takes 26 ms. If I
> ping road runer at 24.94.195.32 it takes 16 ms. I can assume the ping is
> going to RRunner and back.  But why can't I make 192.168.1.12 ping????
> 
> A probably unrelated problem: Eth1 on box #1 fails on boot with "getting
> information from /sbin/Dhcpcd ....Dhcpcd is already running...FAILED."
> It sets up when I do  "ifconfig eth1 192.168.1.11"
> bruce
> 
> 
> 
> 
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