How to disable the NIC, then the connection is normal ?

[Edward S.P. Leung]

Rick Stevens wrote:

> Edward S.P. Leung wrote:
>
>> Rick Stevens wrote:
>>
>>> Edward S.P. Leung wrote:
>>>
>>>> Dear All,
>>>>
>>>> Mine is Fedora Core 6 :
>>>> eth0 ( Internet )
>>>> eth1 ( Intranet )
>>>>
>>>> Now, due to the envoriment problem, the eth1 need to be disable at 
>>>> this moment, so I try to do the following config
>>>> [root at host1 ~]$ cat /etc/sysconfig/network-scripts/ifcfg-eth1
>>>> # Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
>>>> DEVICE=eth1
>>>> BROADCAST=192.168.1.255
>>>> # HWADDR=00:17:31:7E:F8:34
>>>> IPADDR=192.168.1.254
>>>> # IPV6ADDR=
>>>> # IPV6PREFIX=
>>>> NETMASK=255.255.255.0
>>>> NETWORK=192.168.1.0
>>>> # ONBOOT=yes
>>>> ONBOOT=no
>>>> [root at host1 ~]$
>>>>
>>>> After reboot the network function, the server machine can't to 
>>>> connect with Internet again :
>>>> [root at host1 ~]$ ping -c 3 202.175.xxx.xxx
>>>> PING 202.175.xxx.xxx (202.175.xxx.xxx) 56(84) bytes of data.
>>>>  From 202.175.xxx.xxx icmp_seq=1 Destination Host Unreachable
>>>>  From 202.175.xxx.xxx icmp_seq=2 Destination Host Unreachable
>>>>  From 202.175.xxx.xxx icmp_seq=3 Destination Host Unreachable
>>>>
>>>> So, how must I modify the config of eth1 interface, then the 
>>>> connection of Internet will be successful ?
>>>
>>>
>>>
>>> Uncomment the "HWADDR=" line to ensure that the configuration ties to
>>> the correct NIC.  It's possible that the ifcfg-eth1 setup is really
>>> messing with eth0 instead.
>>>
>>> Second, make sure the default gateway is set up correctly, as your 
>>> problem sounds like it's not being set.  If your default gateway is
>>> on the network served by the ifcfg-eth1 file above, then it won't be
>>> set as you don't have a NIC on that network.  The default gateway is 
>>> set
>>> by a "GATEWAY=" line in one of the ifcfg-eth* files or in the
>>> /etc/sysconfig/network file.
>>>
>>> It'd help if you could post the contents of the following files:
>>>
>>>     /etc/sysconfig/network-scripts/ifcfg-eth0
>>>     /etc/sysconfig/network-scripts/ifcfg-eth1
>>>     /etc/sysconfig/network
>>>
>>> Also the output of the commands "ifcfg eth0" and "ifcfg eth1".  You can
>>> obfuscate the actual network addresses if you wish or send the stuff to
>>> me off-list and I can try to help you directly.
>>> ----------------------------------------------------------------------
>>> - Rick Stevens, Systems Engineer                      ricks at nerd.com -
>>> - AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
>>> -                                                                    -
>>> -    When you don't know what to do, walk fast and look worried.     -
>>> ----------------------------------------------------------------------
>>>
>> Hello,
>>
>> [root at host1 ~]$ cat /etc/sysconfig/network-scripts/ifcfg-eth0
>> # VIA Technologies, Inc. VT6102 [Rhine-II]
>> DEVICE=eth0
>> BROADCAST=202.175.xxx.xxx
>> # HWADDR=00:0D:0B:A7:9A:7B
>> IPADDR=202.175.xxx.xxx
>> # IPV6ADDR=
>> # IPV6PREFIX=
>> NETMASK=255.255.255.248
>> NETWORK=202.175.xxx.xxx
>> ONBOOT=yes
>> [root at host1 ~]$
>>
>> [root at host1 ~]$ cat /etc/sysconfig/network
>> NETWORKING=yes
>> NETWORKING_IPV6=yes
>> HOSTNAME=host1
>> GATEWAY=202.175.xxx.xxx
>> [root at host1 ~]$
>>
>> So, would you mind to give me more suggestion / idea / solution ?
>
>
> Ok, I don't see anything grotesquely wrong with that so far although
> I can't verify the default gateway is on eth0's network.  You defined
> a /29 network for it but only gave me the /16 addresses.


Hello !

> Try bringing it up again and run "ifcfg eth0" to verify that it indeed
> has an IP address on the 202.175.*.* network.  If it does, then do a
> "netstat -rn" and verify you have a default route (denoted by a "G"
> under the "FLAGS" column).  If you don't see that, then the gateway
> you've defined isn't on eth0's network and we need to look more closely
> at yur network settings.

Sorry, pardon me....

BTW, I just found out /etc/modprobe.conf
alias eth0 xxx
alias eth1 xxx

So, must we change into these lines ?
alias eth0 xxx
# alias eth1 xxx

Thanks !