CentOS 5 Networking :: IP Address Conflict Log?
Dec 4, 2009
I was particulary suprised to have nothing in my logs regarding an IP address conflict in Linux compared to the windows and its popup !Did I miss something in the logs ? Or is there someting to configure to have it ?Otherwise can I do something to have the date in the dmesg log file ?Here my story about this problem :My linux machine was monitored by Nagios so i've seen some Up/down/up/down phenomene when I came to work this morning. I tried to figured out what's wrong browsing the logs (messages & dmesg & mail/root)... but nothing usefull so far...Then I hearded that a collegue booted a old Windows machine the day before. I checked this machine and there was the classic windows popup regarding a IP address conflict! So that was the problem, the Windows machine have the same IP than de Linux box.I was particulary suprised to have nothing in my logs regarding an IP address conflict in Linux compared to the windows and its popup !Did I miss something in the logs ? Or is there someting to configure to have it ?Otherwise can I do something to have the date in the dmesg log file ?Linux : CentOS 5.4 64bitsWindows : Windows server 2003 32 bits
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Apr 9, 2010
I am running fedora12 in my machine and used virtualbox. I have 3 virtual machine running linux, xp and fedora as well. I have used linux as my gateway and configured NAT for my xp and fedora machine which is under the ip of 192.168.1.0 network.. Everything is fine but often i get error message in my xp machine that says 'there is an ip address conflict'.I just wonder there are only 2 machine on that network and how can there be a ip conflict(i have used a static ip for xp and fedora virtual machine).My ip address for linux is (192.168.5.x and 192.168.1.101). XP (192.168.1.1). Fedora (192.168.1.50).
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Mar 17, 2010
I installed 11.2 on VMware 6.03. My os is windows 7.When I try to go online a pop up showed up
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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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Apr 11, 2011
I am running an application that requires use of my /etc/hosts file. In it, I have my machine name and its LAN ip address. The program creates a service on a specific port, then attempts to connect to it based on the host name. So my hosts file has to be correct.I added the nameservers to resolv.conf and now my application will not run. My guess is that the computer is checking the name servers first, timing out then checking the hosts file.Is there a way I can tell the system to check the hosts file first, then DNS. I thought it should behave that way by default, but it does not appear to.
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Sep 23, 2011
Error installing mod_ssl on centos 5.7. Do not install the mod_ssl module says there is a package conflict, some way to fix it?. is a 64-bit
[Code]...
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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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May 23, 2011
I am a developer, not a network admin - sorry if this ia dumb question. I need to test an application on CentOS 55 64 bit. The instalation went fine and initially I let DHCP work its magic. The router IP address ia 192.168.0.1 and all other VM's I have are granted dynamic ip address on this range (i.e. 192.168.0.x). However, the CentOS vm got an IP address that looks like it belongs on a different subnet :192.168.1.1
The VM (vmware desktop) network setting for this VM uses "Bridged: Connected directly to the physical network". I can ping the host (Windows 7 64 bit) and the host can ping it (it been the VM) - but no other computer on the network can see it. To make things easier, I changed the network configuration to use a static IP address. Here are my configuration files:
/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:0C:29:83:4B:A4
ONBOOT=yes
TYPE=Ethernet
[Code]...
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Feb 17, 2011
i want to change eth0 ip address from 192.168.7.143 to 192.168.7.140, but it not changed even i follow the steps in this tutorial this is content of file /etc/sysconfig/network-scripts/ifcfg-eth0.
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Apr 12, 2010
I have a requirement of switch between wireless network with a single wireless device. First it should be switched to adhoc mode and then after sometime switch to infrastructure mode to establish internet connection. Everything works fine except the gateway settings.
I have used:
system("route add default gw x.x.x.x dev wlan0") to set the gateway, where x.x.x.x is gatewayip address.
I have used this whenever switching happens in addition to ifconfig command to set the ip address and netmask. But this is not setting the gateway ip address. How to set gateway IP address?
System details below
OS :CentoS 5.3
Kernel :2.6.18
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Jun 16, 2011
With virtualbox I do a test session to train myself with centos before I make big mistakes on my production server.I did take a harddiskfile vdi to another computer with virtual box. Now I have the problem that de MAC-address is changed.I can not get the mac adres anymore, becaus those computer is sold. How can i change the trust of the MAC-address in centos? Or must i change de MAC-address? If I may change the MAC-address, i must do that inside centos, end not inside virtualbox, if you understand me?
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Oct 25, 2010
The install went fine but the only issues is getting the server on the network.
I can't ping any thing other that the ip address assigned to the server.
I did it through the gui , the command line and using ifconfig and editing the ifconfi-eth0 file and nothing works.
any ideas on how to get this to work.
i see nothing wrong in the messages.log file either.
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Mar 12, 2009
Centos version: 2.6.18-92.el5
Processor:Intel Xeon L5420 Quad-Core
Guest OS:Windows Server 2008 Web
KVM is istalled using these instructions: [URL] When I run qemu-kvm to boot a VM off the Windows Install .iso with the -no-acpi parameter the VM displays the following:
Windows Boot Manager
Windows failed to start...
Status 0xc0000225
Info: Windows failed to load because the firmware (BIOS) is not ACPI compatible
Without the -no-acpi parameter, the Windows Server 2008 guest shows a blue screen with "stop: 0x000000A5" meaning "The ACPI Bios in this system is not fully compliant to the specification." [URL] 386/32bit and x86/64bit versions of CentOs both exhibit the problem. IT WORKS after I compiled and installed the latest versions of the Kernel (2.6.28.7) and KVM (84) (Using these instructions: [URL] Following advice [URL] I really don't want to run a custom kernel. I compiled various KVM versions with the 2.6.18 kernel but still get the ACPI problem or compiler errors or "Hypervisor too old: KVM_CAP_USER_MEMORY extension not supported" How to get a Windows Server 2008 guest running in KVM on Centos?
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May 8, 2009
Running CentOS 5.3
Recently installed - manually, not with yum, the rpm distribution of the latest MySql (5.1.34) as I needed the latest version, not the one that YUM lists. I am now trying to set up (for the first time) an email server on the same system, and I have been led to believe that postfix and dovecot are the way to go. However when I try to install dovecot I get this:
Matched: dovecot
dovecot.i386 : Dovecot Secure imap server
[root@localhost ROOT]# yum install dovecot.i386
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* extras: mirror.trouble-free.net
* updates: www.gtlib.gatech.edu
* base: pubmirrors.reflected.net
* addons: mirrors.gigenet.com
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package dovecot.i386 0:1.0.7-7.el5 set to be updated
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15) for package: dovecot
--> Processing Dependency: libmysqlclient.so.15 for package: dovecot
--> Running transaction check
---> Package mysql.i386 0:5.0.45-7.el5 set to be updated
--> Processing Conflict: mysql conflicts MySQL
--> Finished Dependency Resolution
mysql-5.0.45-7.el5.i386 from base has depsolving problems
--> mysql conflicts with MySQL-server-community
Error: mysql conflicts with MySQL-server-community
[root@localhost ROOT]# yum deplist dovecot.i386
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May 21, 2009
I have a VPS (Mosso Cloud Server) that is administered and monitored by Platinum Server Mgmt. I have CentOS 5 and Apache 2.2 installed. I requested that my Document Root be set to /var/[URL] and also a subdomain setup to /var/[URL]. They responded by telling me that it would, "[This would] cause a problem with the permissions and that it will be a permissions conflict if you set them to /var/www/. For security and compatibility purposes, they should be in /home/username/.... It can be put anywhere in there." This is the first time I've been involved with any server administration, but while coding on numerous private vps's before, they had a setup similar to what I was requesting. Am I incorrect in my understanding of the previous situations and the Mgmt company is in fact correct?
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May 22, 2009
Basically I have a triple boot setup on a mac pro tower. Windows /osx /centos 5.3 everything was great until I tried setting up my Wacom. I did get it setup but in the process revealed a problem I was having that I didn't notice until this point. Mind you my system boots perfectly everything runs perfectly except I believe my DVDrom and rear usb ports are trying to share the same IRQ and from what it looks like they don't want to play nice with each other. Eventually CentOS kills the IRQ thus killing both devices. Everything works fine on the windows and mac osx side. I have tried unplugging and replugging the DVDROM, I wanted to try another ide channel but the motherboard only has one. I have changed the device from auto to master to slave. When the DVDROM is removed i have no IRQ errors in my dmesg. I forgot to add that adding IRQpoll to my grub boot pretty much destroys the system.... hard lock within 20 seconds of loging in. In CentOS, is there anyway that I can force the DVDROM to it's own IRQ?
Handlers:
[<ffffffff8000d346>] (ide_intr+0x0/0x1df)
[<ffffffff801e65ca>] (usb_hcd_irq+0x0/0x55)
Disabling IRQ #98
hda: lost interrupt
ide-cd: cmd 0x3 timed out
hda: lost interrupt
hda: request sense failure: status=0x51 { DriveReady SeekComplete Error }
hda: request sense failure: error=0x54 { AbortedCommand LastFailedSense=0x05 }
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Aug 6, 2009
I am attempting to get this network card running under CentOS 5.2 but have had no luck. Some sites say to use the sk98lin driver, others the skge, which I can't find at all. I have tried multiple versions of the driver in rpm but none seem to work. The card shows under the network manager but will not get an IP address from the DHCP server.
Here are the outputs for this card.
uname -rmi
2.6.18-92.1.10.el5 x86_64 x86_64
lspci -m
04:01.0 "Ethernet controller" "D-Link System Inc" "DGE-530T Gigabit Ethernet Adapter (rev 11)" -r11 "D-Link System Inc" "DGE-530T Gigabit Ethernet Adapter (rev 11)"
lspci -n | grep "$(/sbin/lspci | awk '/net/ { print $1 }')"
04:01.0 0200: 1186:4b01 (rev 11)
lspci -vv
04:01.0 Ethernet controller: D-Link System Inc DGE-530T Gigabit Ethernet Adapter (rev 11) (rev 11)
Subsystem: D-Link System Inc DGE-530T Gigabit Ethernet Adapter (rev 11)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (5750ns min, 7750ns max), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 121
Region 0: Memory at febfc000 (32-bit, non-prefetchable) [size=16K]
Region 1: I/O ports at e800 [size=256]
Expansion ROM at e0000000 [disabled] [size=128K]
Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
How to get this working as we have 3 of these cards for computers without a Gb NIC and I don't want to fight with it 3 separate times.
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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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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
[code]...
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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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Jan 12, 2010
New CentOS 5.4 system working fine. Sys admins came in and copied the hosts file from one of the servers down to my desktop and ever sincethen machine has been slow (progs take 10-20seconds to load). RunningGnome. Luckily I saved the old hosts file and copied it back and all is now well. But I'd like to understand why, particularly as I will need to change myhostname in the future.
As configured:
/etc/hosts (yes my hostname is "dummyName" that I will need to change later)
127.0.0.1 dummyName localhost.localdomain localhost
[code]....
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Mar 1, 2010
I am accessing a remote DB using JDBC from inside a java program. is there any terminal command with which I can see the remote machine's ip/mac address?
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Dec 14, 2010
I am looking for a way via script to change a systems hostname and IP address!
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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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Dec 9, 2009
I installed Centos server and when I type this command to edit my network IP address I get this error.
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Apr 2, 2011
I've used ssh for a long time, but recently I set up a new server on my LAN. Often when I try to connect to it I get a message like so:
Code:
Warning: the ECDSA host key for '<snip>' differs from the key for the IP address '<snip>' Offending key for IP in /home/<snip>/.ssh/known_hosts:14 Matching host key in /home/<snip>/.ssh/known_hosts:12 Are you sure you want to continue connecting (yes/no)? What is weird is that, in the known_hosts file, the entry for the ip address (line 14) is a "ssh-rsa" type, but the entry for the hostname is a "ecdsa-sha2-nistp256", even though they both connect to the same server. What is going on here?
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Feb 11, 2010
After upgrading centos from 5.3 to 5.4 I have had this error when trying to restart apache:
[root@server1 conf]# apachectl stop
httpd (no pid file) not running
[root@server1 conf]# apachectl start
(98)Address already in use: make_sock: could not bind to address [::]:80
[code]....
I did the following to resolve:
fuser -k -n tcp 80
Then I restarted apache just fine.
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Feb 28, 2011
Installed CentOS 5.5 on VMware ESXi server running vsphere 4.1. Installed fine and picked the E1000 network adapter. But can't get the adapter to become active and pick up an IP address. Has anyone done this before? I can't get it to work. When i was testing CentOS out i used VirtualBox and worked fine using bridged networking but just can't seem to get this network card working.I've put some pictures of the config i've got.http:[url]....
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Jul 28, 2011
In application udp port listening with 3330 i am sending udp request from port 0.0.0.0:3330 to 0.0.0.0:3330 that is same port in the same machine....application works fine udp sending and receiving also fine.....for clarification ....is there any conflicts in the communication ?
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Aug 30, 2010
What happen if we assign a static IP address to both linux and windows host?Consider host A is a ubuntu machine and host B is a windows machine. I first set a static IP for host A (W.X.Y.Z) and connect to it through ssh. Then I duplicate that IP for host B (W.X.Y.Z).The result was that I could no longer connect to the ubuntu machine!
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