CentOS 5 Networking :: Secondary IP Address Won't Work On Eth0
Jul 1, 2011
Everything worked fine until very recently, and without apparently ANY change to the settings on the server, a secondary IP that was assigned to my server won't work anymore..Any IP attached to the same server works fine.. So in my case, the problematic IP is 213.8.155.67. The other IP (213.8.155.42) works without any problem.How would I go about troubleshooting this?
ifconfig:
eth0 Link encap:Ethernet HWaddr 00:26:B9:44:11:3A
inet addr:213.8.155.33 Bcast:213.8.155.127 Mask:255.255.255.128
inet6 addr: fe80::226:b9ff:fe44:113a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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Dec 26, 2010
i install kernel rpm after i boot that kernel network not working kernel name : kernel-rt-trace-2.6.24.7-132.el5.centos.i686 [URL] error "Bringing up interface eth0: Device eth0 has different MAC address than expected, ignoring."
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Jul 8, 2010
New to CentOS5.5 I'm experiencing some trouble in order to continue my configuration. I've just installed my vmware tools and configured my network card with system-config-network
Edit eth0 (eth0) - vmxnet3 -> with a static IP I rebooted my server and since then I lost my eth0. I still see it in system-config-network, but I can't active it anymore.:
/etc/init.d/network start Bringing up interface eth0: Device eth0 has different MAC address than expected, ignoring. [FAILED]
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Oct 22, 2009
after a yum update on my CentOS 5.3 I got this error when shutting down eth0 on reboot...
Shutting down interace eth0: Device eth0 has MAC address XXX instead of configured address XXX ignoring [FAILED]
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Jan 18, 2010
I have a Proliant DL 120 G5 with CentOS 5.4 and I have installed a Brodcom Corporation Netxtrem BCM 5722 Gigabit Ethernet PCI. So I have two interfaces: eth0 broadcom eth1 Intel The eth1 works, instead eth0 don't work. I can ping itself and 127.0.0.1 but I can't ping the gateway. The results of netstat -nr is:
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Apr 14, 2011
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
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Jun 25, 2009
I run an centos server. From the console I can ping google.com and get a reply. But when I ping another address say xyz.com, the IP address is resolved (11.22.33.44) but there is no reply. In the same network in our office from my desktop I ping [URL] and there is a reply.I turned of the firewall but still the same problem.
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Aug 2, 2009
I downloaded Fedora 10 32bit and put it on a Dell Dimension 8200 to save it from the recycle bin. Everything seems to work except I cannot get an IP addr. Roadrunner is my ISP using a cable modem and a Linksys Instant Broadband Series Etherfast Cable/DSL router model BEFSR41. In system-config-network, the nic shows inactive. If I activate it a window opens saying "determining IP information for eth0". After a short time the message adds the word "failed". Using a Windows PC on the same network, I can look at the DHCP connections on the Linksys and I see the MAC addr for the PC running Fedora.
From the OS installation, /etc/sysconfig/networking/devices/ifcfg-eth0 has following:
DEVICE=eth0
HWADDR=00:80:ad:d1:88:c9
ONBOOT=yes
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Jul 1, 2010
Since my upgrade to 10.04 I can't use my eth0 wired connection.The wireless works fine.I have tried auto eth0 in network connections set to manual and dhcp. eth0 shows up in ifconfig but no address is assigned.
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Jun 8, 2010
i know exactly what i need to do, im just not familiar enough with command line to do it properly.i have 7 computers.the first 4 are connected to a router via wireless at one end of the house. of the last 3 only 1 will be able to access the router via wireless, so it needs to share it's one wireless connection via ethernet. this computer i'm going to call 'server'server will have two IP'swlan0 192.168.1.6 this connects to the router that has internet access.eth0 i intend to have the following settingsip:192.168.0.1sub: 255.255.0eth0 will connect to a second router, where the cat5 cable goes from the server, into the internet port of the router where i will define the router's static IP:IP: 192.168.0.100sub: 255.255.255.0gateway 192.168.0.1i have then set the router IP for LAN handling as 192.168.27.1 and all ethernet connections will have a 192.168.27.x IP.
so i need to know how to, without a gui application, use the terminal to assign server eth0 a proper IP address, and tell the server to take the connection it has and share it through eth0 to supply internet for the last 2 computers via ethernet.i had it set up in this way with a windows machine being the one that had the wifi access, but i'd rather have it setup for the ubuntu server to do this task. security is imperative for these 3 remaining machines, so just getting 2 more wifi adapters for a connection to the initial router isn't an option.the 2 that connect to server do so through SSH and though server IS connected via wireless it only makes outward connections through
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Feb 28, 2011
The IP address I want for the gateway computer is 192.168.1.100 As I have 'sharing' enabled in Network manager, there is no provision there to specify the IP address for eth0. That is, cannot manually set it there. Every time I boot up, the IP address changes to
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Dec 19, 2009
I am trying to get networking up on an old PII which I have successfully installed with FC4. There is a link and activity on the onboard interface because I see the indicator lights. The controller is a 3Com PCI 3c905 Boomerang 100baseTx @ 0xdc80.The only message returned by dmesg about eth0 is "Dropping NETIF_F_SG since no checksum feature."The driver module, 3c59x, is loaded as well as the mii module that depends on it.There is something about "unknown parameter`irq'" in the dmesg text regarding the driver.I noticed that eth0 is sharing an IRQ with the UHCI Host Controller.That should not be a problem, but it should not be necessary. And I could do away with USB if this is a conflict and that is the easiest way to solve it.When I drop to console at runlevel 3, and call dhclient, which is installed, I get a message telling me there is no reply to the dhcp request.I don't think the problem is on the router/switch side.
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Aug 21, 2010
I would like to configure the eth0 manually. I can configure the ip address and sub-netmask but the system can't hold my gateway ip address (I added). It will keep it 0.0.0.0. I have no problem when I getting IP address from DHCP server.
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Sep 21, 2010
I have a problem with secondary IP on CentOS 5.5 With network configuration like this
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So I try to add secondary IP
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If i try to add another secondary IP (for ex. xx.231.17.166) xx.231.17.166 *can!* be pinging from global network And if i try to add xx.231.17.147 in network configuration script and reboot server (so this address becomes primary) all works fine. So i need to set xx.231.17.147 as secondary IP, but i can't do it..
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Jan 11, 2010
We recently moved all our Red Hat Linux machines from NIS to LDAP and we're seeing some issues with name resolution.
One thing I should mention is that DNS (the first nameserver in resolv.conf)is being used by LDAP for name resolution.
Now our resolv.conf file has always looked like this.
Search domainname.com
Search domainname2.com
Nameserver xx.xx.xx.xx
Nameserver xx.xx.xx.xxx
The problem is that the above resolv.conf file doesnt work anymore. The only way that our workstations get name resolution is by commenting out the second and forth lines, which happen to be our secondary DNS. This has got me confused because why would resolv.conf be broken by having a secondary nameserver and search path? Shouldnt it just use the first nameserver unless it fails to resolve? Almost seems like just having the secondary in the file breaks name resolution. I cant ping local hosts or anything on the internet unless I do this:
Search domainname.com
#Search domainname2.com
Nameserver xx.xx.xx.xx
#Nameserver xx.xx.xx.xxx
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Jan 22, 2010
I'm having an issue configuring eth0. I'm using ubuntu 8.10 in a virtual machine (VirtualBox). The correct adapter is being used and it has worked in the past. I've tried placing eth0 in dhcp through the GUI and bash, but always get a 169 address or 127.
When I run the following command:
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The output is:
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Feb 18, 2010
I added an init script numbered just before bind9 starts, which needs to see the ipv6 link-local address on eth0. Sometimes this address is not configured, yet. In all cases it eventually is configured.
I am unable to find any script that is configuring the ipv6 link-local address (which is in part based on the MAC address). Does anyone know if there is some script or program that is supposed to be doing this, or is it an internal kernel function?
One workaround I am considering is making this init script go into a loop around sleep 1 to keep checking for the ipv6 address. But I'm concerned this might cause some problems. Any suggestions? I don't want to let it move on to start bind9 until the configuration this script does (more ipv6 addresses) is done.
This is on Ubuntu 9.10 server (for which there is not a prefix choice).
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Dec 14, 2010
a machine with 2+ network cards, need to setup TFTP server on one card and use internet on another.
the tftpd server works on default routing network adaptor with following configuration.
How set the TFTP server on the secondary network adaptor?
TFTP server tftpd by xinetd configuration in: /etc/xinetd.d/tftp
{
protocol = udp
port = 69
socket_type = dgram
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Could not find how to change the post <prefix> I remembered clearly I did before.
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Feb 10, 2011
I have a number of CentOS servers with latest 5.xI have 3 nameservers in the resolv.conf files. All 3 nameservers test out fine when checking for domain lookups.I'm having some trouble with ns1 and shut it down.l None of the CentOS machines fail over to the ns2 & ns3 entries. Basically everything stops resolving even though the other 2 nameservers are alive and well.
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Apr 28, 2009
I'm running a fresh install on an intel i7 system on an asus p6t deluxe v2 motherboard with the onboard NIC (Marvell Technology pci-e). I know the NIC is working as when I boot into the onboard OS that Asus provides (Asus Express Gate SSD)I have a working net connection.Booting up CentOS hangs at determining IP information for eth0 and eventually fails with the following error:PING xxx.170.30.1 from xxx.170.31.231 eth0: 56(84) bytes of data---xxx.170.30.1 ping statistics ---4 packets transmitted, o received, +3 errors, 100% packet loss, time 2999ms, pipe 3 failed.
RTNETLINK answers: file exists.
RTNETLINK answers: file exists.
RTNETLINK answers: file exists.
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Mar 29, 2009
I've a desktop running Fedora 10 connected to the Internet via LAN. There's 3 network controllers in the desktop. One integrated to the motherboard and two additional. I would like to connect other computers (two laptops, one running fc9 and the other Window$ XP) to the Internet via the desktop. I googled the question and found out that I need to adjust thing called 'NAT'.
For that purpose I did the following:
iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -j SNAT --to-source 192.168.*.*
where 192.168.*.* - is desktop' IP address. I want to use 192.168.2.0/24 as a network for laptops. I activated one of devices (eth1), gave it IP address:
ifconfig eth1 192.168.2.0/24
and connected f9 laptop to it.
On the laptop I activated eth0 with the same IP. The problem is: it doesn't work. I can't ping anything from the laptop except its own address (192.168.2.0).
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Apr 30, 2011
my internet was fine.. until.. i had to work in the school so.. a teacher configured the internet settings.. for something .. ( i don't remember) and everything was fine. but when i returned to my house and conected my lap to internet (cable) the internet didn't work.
ubuntu@VR:/etc/network$ ifconfig
eth0 Link encap:Ethernet direcci�nHW 00:1d:72:46:38:3c
Direc. inet:192.168.1.65 Difus.:192.168.1.255 M�sc:255.255.255.0
Direcci�n inet6: fe80::21d:72ff:fe46:383c/64 Alcance:Enlace
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Jan 26, 2011
I have installed the Squeeze testing version. i have setup networking for static in the /etc/network/interfaces file. tried to find resolv.conf in the /etc/ since could not find i created this file post trying to start the eth1 i am able to ping my ip, but if try to ping the gateway i get an error saying the ping is not sucessfull. I have 2 network cards, eth0 and eth1. as eth0 does not work i have configured eth1. The dump of the interfaces file is below
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The same setup works fine in Ubuntu 10.10 setup that i have.
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Mar 13, 2011
I am running the latest ubuntu and I am having trouble getting networking sorted. I have 2 networks, one wired (eth0) and one wireless (wlan0). I connect to the internet using wireless. The problem is that I can only successfully connect to the internet if I disconnect from eth0. I have hit this problem with Windows machines and the solution was to adjust the "interface metric" in "Advanced TCP/IP Settings" so that the wireless was the preferred connection. How can I achieve something similar in Ubuntu?
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Sep 13, 2010
When I shutdown computer and start it up, eth0 doesn't seem to show up (though lspci sees ethernet card and modules are loaded). When i reboot (which is exactly the same, in my opinion), it works good. I'm using Sabayon GNU/Linux, Gnome Network Manager applet.
>uname -srm
Linux 2.6.34-sabayon x86_64
>sudo lspci | grep Ethernet
00:19.0 Ethernet controller: Intel Corporation 82578DC Gigabit Network Connection (rev 05)
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Jun 18, 2010
I installed the Centos 5.5 and after the Xen. After I put a virtual machine named VM01.Initially it worked properly, I tried everything and it worked.When rebooted, I had problems with the network.I have two network cards eth0 and eth1, but eth1 does not have any ip and I use only eth0.The error that appears is:
vif0.0: received packet with own address the source address
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Mar 4, 2009
how can i activate eth0 on terminal ?
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Dec 21, 2010
Installed Centos 5 on IBM T60P laptop. Intel 82573L Gigabit ethernet controller. Keep getting this erro message, "e1000 device eth0 does not seem to be present, delaying initialization."
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Mar 12, 2009
I cannot get static addresses to work on eth0 and eth1. eth0 seems to use DHCP while eth1 uses the static information. Sometimes the static info is used but the interfaces get the addresses reversed.
From /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=mosaic
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Nov 7, 2010
I am having a problem getting a wireless network connection on my DELL laptop running CentOS 5. I have no problem getting a wireless connection when the laptop is booted in Windows XP. I also don't have a problem when booted under CentOS 5 and there is no authentication setup on the wireless router. I only have a problem when I setup authentication. The router wireless log shows the PC connectinng, authenticating, and succeeding authentication.I am using the Broadcom Hybrid-wl wireless driver.
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