[CLUE-Tech] DSL networking issue

[Chris K. Chew]

Your routing table looks fishy to me.  First, you should have stars
(default) or addresses in the gateway column for each of your routes.
Second, the 10.0.0.1 gateway is accessible from eth0 according to your
diagram, but route tells you that it will use eth1 when looking for
10.0.0.1.  In redhat, you should have some
/etc/sysconfig/network-scripts/ifcfg-eth* files that tell redhat how to
configure nics at startup.  I would think that ifcfg-eth0 should look
something like:

DEVICE=eth0
BROADCAST=255.255.255.255
IPADDR=10.0.0.3
NETMASK=255.255.255.0
NETWORK=10.0.0.0
GATEWAY=10.0.0.1
ONBOOT=yes

My first guess is that there you have something else on the BROADCAST or
NETWORK lines, causing redhat to think that you want your routing to be
different than it really ought to be.

After you make changes, run the following command to restart your
networking:

/etc/init.d/network restart

You can also use the route command to change your routing table until the
next time you restart.  You should know this for non-redhat-compliance days.

When troubleshooting network issues, I always start at the very bottom.
"Can I ping the closest machine?  No.  Do I have the correct ip?  Yes.  Do I
have link lights at both ends of the cable?  Yes.  Do I have the routing set
up to let me get to the closest machine?  Maybe.  Oh, then it must be a
routing issue."

Good luck!

Chris

-----Original Message-----
From: clue-tech-admin at clue.denver.co.us
[mailto:clue-tech-admin at clue.denver.co.us]On Behalf Of
jason at matchingmoms.com
Sent: Wednesday, January 23, 2002 10:58 PM
To: clue-tech at clue.denver.co.us
Subject: [CLUE-Tech] DSL networking issue


I'm using RedHat 7.1:

                                          _________
                                         | Firewall|
                                         |         |
                                         |    L    |
--             ___________               |    I    |
W|            |           |      10.0.0.3|e   N   e|
A|____________| Cisco 678 |______________|t   U   t|
L|  63.27.30.5|___________|10.0.0.1      |h   X   h|
L|                                       |0       1|
--                                       |         |
                                         |         |
                                         |_________|

I've got a dynamic IP through Qwest, although it's static right now at
63.217.30.5 (I understand they stay static for a while, at least long enough
to set things up).

I used winipcfg on my Windows box to determine that the Ethernet card on my
Windows box has an IP address of 10.0.0.3 and it's gateway is 10.0.0.1.
Otherwise, ignore the Windows box.

Here's the output of route:

Dest        Gateway         Genmask          Iface
10.0.0.0                    255.255.255.0    eth0
192.168.0.0                 255.255.255.0    eth1
127.0.0.0                   255.0.0.0        lo
default     10.0.0.1        0.0.0.0          eth1

When I'm on my Linux box and type ping 10.0.0.1 it says "trying to ping
10.0.0.1 from 10.0.0.3" and then just hangs.


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