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CentOS 5 Networking :: Change The Primary Nic From Eth1 To Eth0?


Centos 5.3 How can I change the primary nic from eth1 to eth0? My board has 2 nic's and I'm having license issues with cpanel


View 2 Replies (Posted: 2009/5/7 4:52)

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Related Forum Messages For Linux category:
Fedora Networking :: Why Primary Interface Is Eth1 Instead Of Eth0?
I have two network interfaces on my computer but only one of them is connected to an Ethernet cable. Until now on every Fedora release, the activated primary interface has been named as eth0 and everything has always worked well without any problem. Recently I switched to Fedora Core 12 and surprisingly I observed that for the first time, my primary interface has been considered by the system to be eth1 instead of eth0. I tried to replace the content of ifcfg-eth0 by ifcfg-eth1, yet system gave me an error that there was MAC address mismatching. I conserved their MAC addresses in their files and just replaced other connection parameters ( such as IP ADDR, NETWORK, NETMASK, etc.) but it did't work. When I do "server network restart", the command blocks.

As I try to install oracle on this system, regarding the fact that oracle requires static network configuration on the primary network interface, I don't know how to proceed in order to set eth0 as my primary interface (or rather set the current eth1 to eth0 because it is actually eth1 that refers to my activated primary network card).Just one more time, I would like to remark, that with previous versions of the Fedora Core, on the same computer (with the very same two network cards) I never had problem and I had installed oracle on the system with success, having the statically configured eth0 correctly detected by the system.

Posted: 31st January 2010, 12:15 PM

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CentOS 5 Networking :: Eth0, Eth1, Eth1:0, Route = Get One Gateway For All The Eth?
I need to setup two ethernets in my Centos box. OK no problem both ethernet and 1 virtual works perfect. eth0, eth1 and eth1:0. I'm trying to set up diferent routes for eth0 and eth1/eth1:0 I need eth0 has a 192.168.1.1 gateway and eth1/eth1:0 192.168.1.100 gateway.I think I've tried almost every thing but always get one gateway for all the eth.These are my config..

/sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:XX:XX:XX:XX:XX
inet addr:192.168.1.168 Bcast:192.168.1.255 Mask:255.255.255.0[code]......

Posted: 2011/3/4 14:18

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Networking :: Sending Video Streams From Eth0 And Eth1 To The Other Server Programs' Eth0 And Eth1?
I try to generate a server client code. What i try to do is sending video streams from eth0 and eth1 to the other server programs' eth0 and eth1. In order to do that, i decided to use SO_BINDTODEVICE. But the code is not working. Am i misunderstood the usage of SO_BINDTODEVICE.

1-Defining two ports
2-Defining two sockets
3-Assigning host ips on them

[code]....

Posted: 07-30-2010, 01:45 AM

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Fedora Networking :: Change Eth1 Into Eth0 And Viceversa?
I have two network devices :

1. Intel Corporation 82574L Gigabit Network Conncection (Currently eth0, Mac=00:0e:8c:ab:c6:b1)

2. National Semiconductor Corporation DP83815 (Currently eth1, Mac=00:0e:8c:8a:70:62)

I want to change them so that the "Intel" become eth1 device and the "National" become the eth0 device.

I already tried these steps :

1. I disabled the Network Manager and enabled network

2. Edit the /etc/udev/rules.d/70-persistent-net.rules like this

Quote:

3. Change the /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/sysconfig/network-scripts/ifcfg-eth1 MAC addresses.

4. Reboot

5. After it bootup the Fedora can't recognize the devices, if I do ifconfig -a it shows "eth0_rename with FF:FF:FF:FF:FF:FF mac address".

Posted: 3rd April 2009, 12:48 PM

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Networking :: Kernel - Forward Packets From Eth0 To Eth1 And Eth1-to Eth0 As Well As Get A Copy Of These Packets For Analysis
I have a hardware device with two ethernet ports, eth0 and eth1 running Centos 5. Basically my goal is to forward packets from eth0->eth1 and eth1->eth0 as well as get a copy of these packets for analysis. If I set IP routing to do the forwarding then I won't get a copy of the packets for analysis.

Posted: 09-27-2010, 12:52 PM

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Ubuntu Networking :: Change Eth0 Back To Be Primary Nic?
I've been fighting with this nearly for three hours, but nothing seems to be working. I have one Gigabit Realtek chip integrated on my Mainboard (which I use for internet connection), and one aditional 100Mbit in PCI slot. So, I basically want to use this 100Mbit for testing purposes, but when I connect something to this 100Mbit NIC adapter, it becomes default and I can not access internet. So, I want to set my eth0 (gigabit integrated adapter) as default adapter.

P.S. I've tried to edit /etc/network/interfaces and iftab, but nothing worked.

Posted: March 16th, 2011

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CentOS 5 Networking :: Use The Eth1 For That Application And Not The Default Eth0?
I have 2 network interface on 1 server and i got a problem finding a solution for it.I have 1 java application and i want it to use the eth1 for that application and not the default eth0. On eth0 i got for example xx.xxx.xx.22 and on eth1 i got xx.xxx.xx.23 and i want the java app to use the 23 ip one.

Posted: 2010/11/8 14:00

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CentOS 5 Networking :: Eth0 Takes Traffic Of Eth1?
I'm having a problem and despite I have googled a lot cant find the root cause. I have a server with two embedded NICs and centos 5.5 loaded. I need to have one NIC with a fix internal IP address to communicate with the intranet and a second NIC with a fix address from my telephone provider. I know I cant have two different gateways on the net so I configured only the gateway for the second NIC leaving the field empty for the first.

I found that the first NIC is handling all the traffic for both interfaces (eth0 and eth1) and the second NIC is in standby (or doing nothing). This is causing the traffic intended for the second NIC never reach their destination. After a couple days working with the BIOS and other configuration files I tried another way of solve the issue. I put a fix address for the first NIC and another fix address for the second NIC (both in the same subnet) and from a computer pinged successfully both addresses. However if I disconnect the cable for the first NIC both interfaces goes down (eth0 and eth1) and both pings fails. If I disconnect the cable for the second NIC (with the first one connected) both pings still running without any disturbance.

I worked also in a second server with different hardware (different kind of motherboard, different NIC manufacturer, etc.) but the problem is also present in this second server. I was reading about NIC bonding or teaming, but this configuration is not present in the modprobe.conf or in the ifcfg-eth0 files, so I believe the problem is not related with this feature. Do you know what is happening with the NICs and how can I get two really, fully independent NICs?

Posted: 2010/10/18 23:22

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CentOS 5 Networking :: Bridging Of Eth0 And Eth1 Doesn't Work?
Problem: Can't get bridging to work properly.

I'll start by saying that most of this is built inside of a 64bit ESXi 4.1.0 server. Should be obvious by the picture below.

Trying to set up a bridged CentOS box. Ultimate goal is to set up a Transparent Firewall. The machine labeled 'Desktop' is a Windows XP running DHCP. It gets assigned an Internet routeble IP address. At this point, nothing is running a firewall.

Symptoms:
Gateway can ping CentOS bridge
CentOS bridge can ping gateway
CentOS bridge can resolve DNS names and ping FQDNs on the Internet.
CentOS bridge CAN NOT ping Desktop

[Code]....

Posted: 2011/4/14 22:15

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Networking :: Eth0 Fixed IP - Eth1 DHCP Gateway - Access To Eth0?
5.10 Breezy configured as machine controller. Works great eth0 is a fixed IP to communicate with controller comms board. Not easy at all to alter - the comms board is hard coded to listen on eth0 for commands.

I can use eth1 as the default gateway and ping google.com, etc. But when I now attempt to communicate with the controller with netcat, e.g.

Code: echo !HH | nc 192.168.1.6 80

I obviously never get an answer since the request is passed via eth1. Using the -g option with netcat doesn't work either. I had a look at iptables but it doesn't seem to be able to do what I want. How I can still use eth0 as my communication port to the controller whilst eth1 is the default gateway?

Posted: 08-19-2009, 11:31 AM

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Networking :: Production Server With Static IPs On Eth0 And Eth0:1 - Getting Private LAN On Eth1?
I have two servers on a vlan at my datacentre/colocation and previously both servers had public IPs on their eth0 interfaces. The servers are HP ProLiant DL360s - one is a G4 and one is a G5 The newer G5 is now the LAMP server and the G4 has been retired and I want to repurpose it as an iSCSI target using openfiler freenas or similar.

My G5 has public/static IPs lashed to the eth0 physical interface and the eth1 is not configured to do anything yet. The G4 will have both interfaces available - perhaps one for ssh access from one of my static public IPs and the other to be a private IP on the local vlan. Here is what I am trying to get my head around...

The G5
eth0 - Public IP - full LAMP services on two or three virtual interfaces
eth1 - Private IP 192.168.0.1
The G4
eth0 - Public IP for ssh
eth1 - Private IP 192.168.0.2

Because my traffic between eth1 on these boxes is via private IPs on the local private vlan it doesn't add to my quota for bandwidth. How do I go about configuring the routing and gateways and other aspects of this so that I can run a private IP space network between the eth1s and still serve the outside world from the eth0s...

I am afraid that if I assign the private IPs to the eth1 interfaces the routing may either not work or interfere with the access to the production internet facing interfaces (eth0s).

Posted: 07-01-2010, 12:29 AM

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Red Hat :: Change Eth1 To Eth0 ?
I'd like to ask you all for a simple thing on Slackware that I dont know how to do under RHEL 5.4.

Under Slackware 12.2 it is easy to change eth0 to eth1.

This should be done in file: /etc/udev/rules.d/75-network-devices.rules:

Code:

Code:

Well, under Red Hat it looks slight diffrent. It looks like RHEL does not use udev ( correct me if i am wrong but there is no simillar file in /etc/udev/rules.d and cant see any script in /etc/init.d/).

I have found that all NIC configuration is stored in /etc/sysconfig/netwotk-scripts/ifcfg-ethx.

On this file it is possible to place varible: HARDWARE=

However after reboot it doesnt work. So, my question is - how to assign eth[number] to specified MAC-addr ?

Posted: 06-22-2010, 05:00 AM

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Fedora :: Change The Network Default Eth0/eth1 In F12?
I'm using F12 on an old box which I have fitted with a new networkcard. I'm using the box as a music server (Twonkey) and want to use the new card (gigabit - eth1) as the default, but seem unable to. I can't switch of the mainboard ethernet option (eth0) in the bios and have tried to change the settings in the ifconfig-eth0 and -eth1 files by changing the hardware addresses as elsewhere recommended, but that doesn't work. During start-up it then gives me an error message that the MAC number was not the expected one. This would indicate that the network options are kept/read elsewhere. I'm not very familiar with Linux/F12. how to make the card the default option instead of the mainboard option.

Posted: 12-04-2010, 07:11 AM

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CentOS 5 Networking :: Configure Firewall - Allow And Forward All Traffic On Eth0 And Block All Traffic On Eth1 Except Ssh Ping
I need to set up my centOS computer as a firewall in my home network. Ive got 2 interfaces, eth0 and eth1. I want to allow and forward all traffic on eth0 and block all traffic on eth1 except ssh, ping(icmp) and DNS. How do I do this? Ive tried some editing in /etc/sysconfig/iptables but no luck.

Posted: 2010/9/29 8:43

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General :: Change Ethernet Adapter Name Eth0 To Eth1 And Vice Versa
i have just installed fedora core 12. my pc has 2 lan adapter. 1. onboard rhine. 2. intel card. os has given eth0 to onboard card and eth1 to intel but i want eth0 to intel card and eth1 onboard card.

Posted: 01-29-2010, 05:01 AM

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CentOS 5 Server :: DHCPD On ETH1: Distribute ETH0-received DNS?
this should be trivial for all you big sysadmin guys My box is a firewall/gateway. ETH0 is on the Internet-side, and is fully auto-configured (DHCP client) from my ISP. ETH1 is on the LAN-side, has DHCPD enabled, and I route the traffic to/from the Internet via iptables (NATting, of course). Everything works pretty good, except for the DNS-server assignment via DHCP: how can I configure dhcpd.conf to assign the SAME dns-server I receive from my provider on ETH0 to all my PC on ETH1?

Posted: 2009/9/14 8:51

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Networking :: Eth0 Or Eth1 - What Is The Difference
I've noticed that when Linux boots on different machines or with different versions, the network card is assigned to eth0 or to eth1, when there is only one network card. What is the difference and is there any way to tell which one it will be for any machine or version?

Posted: 11-30-2010

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Networking :: Switch Eth1 To Eth0 ?
I installed Slackware 13.37 console only.

I have two ethernet cards.

I want to change eth1 to eth0 and eth0 to eth1, because I have some old firewall script and I need eth0 be eth1, because of routing internet. My ISP close my net connection on MAC adress.

Posted: 05-04-2011, 04:20 PM

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Networking :: Eth0 Works Great - Eth1 Not Working ?
Ok, so eth0 is up and working great. eth1, however, comes up with a link light, however the packet counters in ifconfig remain at 0. Appears that eth1 isn't working.

Here's my setup:

-Dell latitude CPi laptop with 2 PCMCIA network cards and no built-in ethernet.
-Slackware v11
-eth0 is connected inside my router on my 192 network. Static address with good connectivity
-eth1 is connected on the other side of my router in promiscuous mode in order to listen to the traffic coming into my network.

Troubleshooting so far: I have switched the pcmcia cards between slots and regardless of which card is in eth0 or eth1, eth0 works and eth1 does not. I have also switched the card dongle between cards as well as the ethernet cabling between the cards. With any of the combinations eth0 works like a champ but eth1 does not, so I think I've ruled out hardware problems.

Posted: 05-14-2010, 01:46 AM

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Networking :: How To Find Out Which Eth0 Or Eth1 Does Card Belongs
I have in my ubuntu 3 eth?
eth0
eth1
eth2

just eth1 has an IP address...

I just have remote access to the server via ssh.

How do I find out which eth0 is a fiber nic ? Because I know one of them are.. but I cannot assign any IP address to them..

which eth? belongs to this fiber nic ?

Posted: 06-15-2011, 11:34 AM

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Networking :: Cable Disconneciton Eth0 And Eth1 Behaviour
I need to have the configuration showed on the attached file. I have two machines, one PC (ubuntu 9.10 ) and one embedded CPU with a tailored linux version starting from 2.4.31 linux kernel with Busybox running on PPC architecture.

PC address is 192.168.30.70.

On CPU board I have two ethernet interfaces with addresses :
eth0 192.168.30.30 netmask 255.255.255.0
eth1 192.168.30.40 netmask 255.255.255.0

PC sends messages alternatively to 192.168.30.40 and to 192.168.30.30 .Between two machines there is an ethernet switch to allow messages flowing.

I use ping (from two shells on PC I ping the two addresses on CPU) to simulate messages from PC to CPU and I see this behaviour:

Starting from a situation in which CPU responds to the pings I try to disconnect cable connected to eth0 on CPU. I cannot see any interruption on ping reply on the eth0 port. If i reconnect the cable on eth0 and I disconnect cable on eth1 there are no reply to the two pings (neither from eth0 nor from eth1). It seems that all data flows on one cable just because the addresses are on the same subnet. Is this right?

If this is the right behaviour how can i separate data from PC to CPU in order to force packets to flow on two cables and avoid this sort of internal routing beetween eth0 and eth1?

Posted: 03-10-2010

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Ubuntu Networking :: Sharing The Internet From Eth0 To Eth1?
im a linux noob dont get techy ill die of brain fry im running a craft bukkit minecraft server on my 11.04 ubuntu server. however the server uses my only 10m Ethernet cable that i normaly use for my ps3 (i will NOT go wireless. i hate it (or dont like it)) therefor i found an old PCI NIC in an old computer, its a 10/100 realtek one. ifconfig detects it (after two commands:

Code:
ifconfig eth0 up
dhclient eth0
)

now i need to send the internet to my ps3 too.i know the connection wont be blazing fast but isnt it okay?it musnt interrupt the minecraft server. if you need info just ask. ill try and provide them.

Posted: May 11th, 2011

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Ubuntu Networking :: Route Internal Ip On Eth1 To External Ip On Eth0?
Im setting up a server thats connected to a large network. Now my external ip on the network is static and is 10.0.12.15. What I want is to create a dhcp network using the second port of my box. The first port eth0 goes to my network with the static ip 10.0.12.15 and my second port is connected to a switch with the static ip 192.168.12.1. Now dhcp works fine but none of the boxes that are connected to the internal ip cannot connect to the internet. Iv tried using squid and manual static ip routes. Im not using network manager or anything cause its a command line server.

Posted: December 9th, 2010

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Networking :: Pinging Multiple Interfaces - Getting Pings From Eth0 But Not From Eth1?
I have two network interfaces and their entries are shown as eth0 and eth1... I want to assign them static IPs which I do by

ifconfig eth0 192.168.9.245 netmask 255.255.0.0 up
ifconfig eth1 192.168.8.245 netmask 255.255.0.0 up

But I am not sure if it will ping both the interfaces if I issue a command

ping -I eth0 192.168.9.113 (machine in network)
ping -I eth1 192.168.9.113 (machine in network)

I am getting pings from eth0 but not from eth1

Posted: 02-26-2011, 12:19 AM

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