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Config problems, "error some other host already uses"

I have two network cards and was working on eth1. Something happened when I was figuring out how to change the settings via command prompt to make an error occur on eth0. The error says "error some other host already uses this ip address."  Nothing is using the ip address and I can't ping it or locate it in any way.

I am also seeing a "netfilter" message pop up. when I restart things. I don't remember that in the past.

Thank you in advance for your help.
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2 Solutions
chek if you r not tryint to use the same IP on both the network cards . Use
#ifconfig -a

this will give you the Ip address used by both the net cards

noe if you r using only one card set the just shut down the other interface by
# ifconfig eth0 down   -- If you want to shut down eth0 interface
# ifconfig eth1 down   -- If you want to shut eth1 .

You can change Ip address by

#ifconfig eth0 IP_ADDRESS NET_MASK
jsfaldAuthor Commented:
They both seem to be set correctly. But it is difficult to tell. This is why. ifconfig -a doesn't show the IP addresses at all. Also when the computer starts it displays one address for eth0 and another address 64.72.*.* (The stars are real numbers) for the eth1 address. I am getting the error message for both of them now.

Also, the GUI that comes with Redhat shows the proper ip addresses. It just can't save it properly because of the error.
Try removing your Network Config all together and set it back up.

Are you using one of the NIC's for an internal network and the other for Internet access?

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jsfaldAuthor Commented:
Let me give some more background.

The server is behind a physical firewall with one-to-one NAT set up. (The ip address for eth0 was with the public ipaddress assigned to it.)

eth1 had an ip address but nothing useful was mapped to it. The firewall has a WAN, LAN, and DMZ ports. I was assigned to move the email services from one server to this server so I wanted to start using eth1. I also wanted to hook up one connection to the DMZ.

This is "briefly" what happened.
I was using an ssh client connected to the eth0 address. I typed i"fconfig eth1 <public ip address>" and hit enter by accident when I was trying to look at the man pages for the syntax and other options. At that point my ssh connection was disconnect and I lost all network access to the server.

At a shell prompt I tried "service network restart". The network cards will be shutdown "OK" but then fail to restart. The error again is.  "Error some other host already uses this IP address" and it will state the respective IP address. It would also say "2000-2002 Netfilter..." or something like that, which I haven't seen before.

When I type "ifconfig -a" the three adapters lo, eth0, and eth1 will display but the eth* does not show any IP addresses.

Here is a funny thing that happened. I restarted the computer. On the screen it showed the "login:" prompt. I disconnected the cable from the DMZ port and plugged it into the switch. On the screen it said "e100: eth0 NIC Link is down" (I don't remember exactly) but then on the next line it said "e100: eth0 NIC Link is up 100 Mbps Full duplex."  What is that all about? Is that normal for something like that to display when I haven't logged in and the symptoms above still exist?

After a few hours of using the GUI, "netconfig", and interfaces I was getting no where so I decided to not use the DMZ and assign the cards ip address of and I then changed, or my coworker, then changed the firewall settings to map the public IP address to these two addresses.

The server is working fine with the NAT set up. But I would still like to know I had this problem and if this problem is going to come up next time I try to restart my network service. I would still like to get the DMZ set up but am scared to change the settings and restart the network just to get the same error.

jsfaldAuthor Commented:
I'll change the question a little.
Could smbd and nmbd configuration make the network service think the addresses are already taken?

What are the steps necessary to setup one card on the LAN and one card on the DMZ?  
jsfaldAuthor Commented:
I still don't know what setting was being kept in memory or why it happened. I don't what to lose 300 points withoug a definite solution. Oh, well, have 150 points each for your suggestions.
Thanks. I wish I could have helped you more.

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