On 08/14/2013 08:16 AM, Edison, Arul (GE Healthcare) wrote:
> Hi ,
>
> I am using the repacked version of Scientific Linux 6.3
>
> My PC has a mother board , which has 2 Ethernet port
>
> eth0 is connected to a device & IP configured for eth0 is 192.168.2.1
>
> eth1 is connected to a hub. This is intern connected with another PC. IP
> configured for eth0 is 192.168.1.20
>
> The issue here is eth0 IP Address is now got changed to the IP address
> of eth1 when the Device connected with eth0 become powered on .
>
> With this, eth0 & eth1 has same IP address. Because of this the
> application running on Scientific Linux 6.3 PC is not able to
> communicate with the Device connected with eth0. I have enclosed the
> /var/log/message file below for the reference
>
> Please suggest me what is the configuration to be done for the same?
>
> /etc/sysconfig/network-scripts/ifcfg-eth0 file from system is as below:-
>
> *******************************************
>
> DEVICE=eth0
>
> ONBOOT=yes
>
> BOOTPROTO=none
>
> IPADDR=192.168.2.1
>
> NETMASK=255.255.255.0
>
> /etc/sysconfig/network-scripts/ ifcfg-eth1 file from system is as below:-
>
> *****************************************************
>
> DEVICE=eth1
>
> BOOTPROTO=none
>
> #IPADDR=192.168.1.90
>
> IPADDR=192.168.1.20
>
> NETMASK=255.255.255.0
>
> When the Scientific Linux 6.3 Pc is booted , the network configuration
> of the system is as below:-
>
> ************************
>
> eth0 Link encap:Ethernet HWaddr 00:0B:AB:38:29:A6
>
> inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0
>
> UP BROADCAST MULTICAST MTU:1500 Metric:1
>
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:1000
>
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>
> Interrupt:16 Memory:fdbc0000-fdbe0000
>
> eth1 Link encap:Ethernet HWaddr 00:0B:AB:38:29:A7
>
> inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0
>
> inet6 addr: fe80::20b:abff:fe38:29a7/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:381 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:267 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:1000
>
> RX bytes:26234 (25.6 KiB) TX bytes:29696 (29.0 KiB)
>
> Interrupt:17 Memory:fddc0000-fdde0000
>
> lo Link encap:Local Loopback
>
> inet addr:127.0.0.1 Mask:255.0.0.0
>
> inet6 addr: ::1/128 Scope:Host
>
> UP LOOPBACK RUNNING MTU:16436 Metric:1
>
> RX packets:4 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:240 (240.0 b) TX bytes:240 (240.0 b)
>
> When the Device that is connected to the eth0 is powered on and booted,
> the network configuration of the system changed as below:-
>
> *****************************
>
> eth0 Link encap:Ethernet HWaddr 00:0B:AB:38:29:A6
>
> inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0
>
> inet6 addr: fe80::20b:abff:fe38:29a6/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:4 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:1000
>
> RX bytes:240 (240.0 b) TX bytes:9814 (9.5 KiB)
>
> Interrupt:16 Memory:fdbc0000-fdbe0000
>
> eth1 Link encap:Ethernet HWaddr 00:0B:AB:38:29:A7
>
> inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0
>
> inet6 addr: fe80::20b:abff:fe38:29a7/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:6077 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:4412 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:1000
>
> RX bytes:427716 (417.6 KiB) TX bytes:287127 (280.3 KiB)
>
> Interrupt:17 Memory:fddc0000-fdde0000
>
> lo Link encap:Local Loopback
>
> inet addr:127.0.0.1 Mask:255.0.0.0
>
> inet6 addr: ::1/128 Scope:Host
>
> UP LOOPBACK RUNNING MTU:16436 Metric:1
>
> RX packets:42683 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:42683 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:4447027 (4.2 MiB) TX bytes:4447027 (4.2 MiB)
>
> /var/log/message file is as below:-
>
> ******************************
>
> Aug 17 11:54:42 magic kernel: ttyS2: LSR safety check engaged!
>
> Aug 17 11:54:46 magic kernel: ttyS2: LSR safety check engaged!
>
> Aug 17 11:54:57 magic kernel: e1000e: eth0 NIC Link is Up 1000 Mbps Full
> Duplex, Flow Control: None
>
> Aug 17 11:54:57 magic kernel: ADDRCONF(NETDEV_CHANGE): eth0: link
> becomes ready
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> (eth0): carrier now
> ON (device state 2)
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> (eth0): device state
> change: 2 -> 3 (reason 40)
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> starting connection 'eth1'
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> (eth0): device state
> change: 3 -> 4 (reason 0)
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 1 of 5 (Device Prepare) scheduled...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 1 of 5 (Device Prepare) started...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 2 of 5 (Device Configure) scheduled...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 1 of 5 (Device Prepare) complete.
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 2 of 5 (Device Configure) starting...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> (eth0): device state
> change: 4 -> 5 (reason 0)
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 2 of 5 (Device Configure) successful.
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 3 of 5 (IP Configure Start) scheduled.
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 2 of 5 (Device Configure) complete.
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 3 of 5 (IP Configure Start) started...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> (eth0): device state
> change: 5 -> 7 (reason 0)
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 4 of 5 (IP4 Configure Get) scheduled...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 3 of 5 (IP Configure Start) complete.
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 4 of 5 (IP4 Configure Get) started...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 5 of 5 (IP Configure Commit) scheduled...
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 4 of 5 (IP4 Configure Get) complete.
>
> Aug 17 11:54:57 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 5 of 5 (IP Configure Commit) started...
>
> Aug 17 11:54:57 magic avahi-daemon[1624]: Withdrawing address record for
> 192.168.2.1 on eth0.
>
> Aug 17 11:54:57 magic avahi-daemon[1624]: Leaving mDNS multicast group
> on interface eth0.IPv4 with address 192.168.2.1.
>
> Aug 17 11:54:57 magic avahi-daemon[1624]: Interface eth0.IPv4 no longer
> relevant for mDNS.
>
> Aug 17 11:54:57 magic avahi-daemon[1624]: Joining mDNS multicast group
> on interface eth0.IPv4 with address 192.168.1.20.
>
> Aug 17 11:54:57 magic avahi-daemon[1624]: New relevant interface
> eth0.IPv4 for mDNS.
>
> Aug 17 11:54:57 magic avahi-daemon[1624]: Registering new address record
> for 192.168.1.20 on eth0.IPv4.
>
> Aug 17 11:54:57 magic kernel: e1000e: eth0 NIC Link is Down
>
> Aug 17 11:54:58 magic NetworkManager[1612]: <info> (eth0): device state
> change: 7 -> 8 (reason 0)
>
> Aug 17 11:54:58 magic NetworkManager[1612]: <info> Activation (eth0)
> successful, device activated.
>
> Aug 17 11:54:58 magic NetworkManager[1612]: <info> Activation (eth0)
> Stage 5 of 5 (IP Configure Commit) complete.
>
> Aug 17 11:54:58 magic NetworkManager[1612]: <info> (eth0): carrier now
> OFF (device state 8, deferring action for 4 seconds)
>
> Aug 17 11:54:58 magic avahi-daemon[1624]: Registering new address record
> for fe80::20b:abff:fe38:29a6 on eth0.*.
>
> Aug 17 11:55:00 magic NetworkManager[1612]: <info> (eth0): carrier now
> ON (device state 8)
>
> Aug 17 11:55:00 magic kernel: e1000e: eth0 NIC Link is Up 1000 Mbps Full
> Duplex, Flow Control: None
>
> Aug 17 11:57:39 magic kernel: device eth0 left promiscuous mode
>
> Thanks,
>
> Arul
>

Ditch NetworkManager.  It causes more headaches than it is worth.

-Mark


-- 
Mr. Mark V. Stodola
Senior Control Systems Engineer

National Electrostatics Corp.
P.O. Box 620310
Middleton, WI 53562-0310 USA
Phone: (608) 831-7600
Fax: (608) 831-9591