[NTLUG:Discuss] Troubleshooting a network connection - fixed

[Fred Hensley]

Glad to read Leroy discovered and corrected his issue.

That being said, I recall that someone earlier wrote about the benefits 
and simplicity of setting up an IPCOP firewall instead.  That same 
ridiculously easy IPCOP installation described earlier includes a 
purposeful configuration/mapping of ethernet interfaces to IPCOP 
security zones.  And, after all is said and done, you can save the 
completed configuration (with our without hardware mappings) to an 
offline for quick restoration to a new server later.  Game, set, match...

My $0.02 added, end of commercial, and back to your original CentOS 
programming....

Cheers,

-Fred-

Fred Hensley
fred.hensley at comcast.net

Terry Henderson wrote:
> On 5/11/06, LEROY TENNISON <leroy_tennison at prodigy.net> wrote:
>   
>> As usual I stumbled across the solution quite by accident (or maybe it was divine help).  Noticed that the MAC address seemed different under Knoppix which led to the discovery that CentOS had selected opposite NICs for eth0 and eth1 from what Red Hat 9 used.  This may be due to my starting out with only one NIC originally under RH9 and then adding the second later, it's been too long to remember.  What I did was put
>>
>>  HWADDR= ...
>>
>>  in both ifcfg-eth0 and ifcfg-eth1 (both in /etc/sysconfig/network-scripts, this path will be different for other distros such as SuSE).
>>
>>  This raises a couple of questions:
>>
>>  How does Linux decide which NIC is going to be eth0, eth1, and so on?
>>     
>
> The question is not "How does Linux decide which NIC is going to be
> eth0"  but rather how does the install program "decide which NIC is
> going to be eth0"
>
> There are applications such as "system-config-network" that allow you
> to manipulate address settings  for your NICs (and it also shows  you
> the driver module assignments as well).
>
> ("system-config-network"  is particular to Fedora)
>
>
>   
>>  How do I tell what driver is being used for eth0 and eth1.  'ifconfig' gives me the hardware address and IP configuration but doesn't tell me what driver.
>>
>>  Anyone know where the format of ifcfg-eth0, ifcfg-eth1 and so on is documented?
>>
>>  Thanks for the help.
>>
>> _______________________________________________
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>>
>>     
>
>
>