CentOS 5 Networking :: Bridging Interface Using A Customized CentOS Distro?

Jan 18, 2011

ok I am using a customized CentOS distro that is looking for 3 network cards on boot. eth0, eth1, eth2. I do not need eth0 and need to bridge it to eth1.

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CentOS 5 Networking :: Bonding Or Bridging?

Jul 19, 2011

I am confused as to what is going on with a particular box that I am working with.As you can see in the attached ifconfig print out, one eth port is basically only used as a output while the other is only really used as an input.I connect to the box via for ssh,ftp,http,etc.I just want to know the name of what is happening (is it bonding,bridging?) and maybe some information about where it is configured.I looked in modprobe.conf

eth0 Link encap:Ethernet HWaddr 00:1E:C9:EE:5A:91
inet addr: Bcast: Mask:
inet6 addr: fe80::21e:c9ff:feee:5a91/64 Scope:Link

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CentOS 5 Networking :: Network Bridging MAC Conflicts In KVM After System Rebuild?

Mar 24, 2011

After restoring from a hardware failure, I cannot get bridging to work again. I reinstalled the host version 5.5, and copied the .img file back onto the rebuilt machine. I also had the network scripts and iptables backed up. Through virt-manager I re-attached the virtual machine, and when I boot it, I get a MAC address conflict on the vm's eth0; "Device eth0 has a different MAC address than expected". The vm had a static ip address.

[root@trngvh ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1


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CentOS 5 Networking :: Bridging Of Eth0 And Eth1 Doesn't Work?

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.

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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CentOS 5 Networking :: Add Customized Packages In A Remote Install(NFS)?

Apr 26, 2010

how to add a new package to my kickstart

#System language
lang en_US
#Language modules to install
langsupport --default=en_US


The package i want to add is a network software [URL] what is the command i have to add to my post section after i download ntop.

ntop is in xxxx.tar.gz

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General :: Configure OpenVPN And Internet Bridging In CentOS?:

Feb 14, 2011

I only have very basic understanding on how it works.This question may have been asked so many times, and honestly I've tried so many tutorials and have read a lot of articles but it all didn't worked. I may be too stupid to have this done, or it is just the lack of knowledge.

Here it goes,I have a VPS with a host which runs OpenVZ in LA. I want to create a VPN tunnel to the VPS and tunnel all my internet traffic to the VPS. Can somebody please help me out on the step-by-step?

I was once able to configure the VPS to run OpenVPN and my client pc was able to connect to it, but the internet connection is still thru with my local connection. Did it with a tutorial too. I would also like to ask, The VPS has 512mb of RAM, I was wondering how many clients can it handle at the same time.

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CentOS 5 Networking :: Wifi - Best Usb Wireless Nic For Distro / Release?

Jul 28, 2010

I have a couple of dell precision boxes running centos 5.4, that are occasionally sent to trade shows. I would like to set them up to connect to wireless networks. Question, what is generally considered the best usb wireless nic to purchase for this distro/release? Also, any opinions on the best wireless aircard and carrier to use, ie; sprint at&t, etc?

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Networking :: CentOS 5.5 And Virtual Interface Configuration

Jun 17, 2011

I have a webserver with 3 virtual interfaces named eth0:1 eth0:3 and eth0:3. Until yesterday all the virtual ip's worked but eth0:1 decided that it just won't work anymore since yesterday. The configs are:





eth0:3 and eth0:4 still work, but 2 doesn't

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CentOS 5 Networking :: Route Add With Specific Interface?

Apr 19, 2009

I have an Asterisk-server with 2 interfaces, a WAN-interface (eth1) and a LAN-interface (eth0).


IAX-provider(internet) --> firewall --> Asterisk-server --> switch --> clients_on_LAN

So everything coming from the IAX-provider on port 4569 is forwarded to the Asterisk-server's WAN-interface (eth1).
This needs then be routed to an internal SIP-phone (an IVR-system will define which one) via eth0.

When a call is initiated from an internal SIP-phone (they register to the IP-address assigned to eth0) it needs to be routed via eth1 to the gateway ( Asterisk will setup an IAX-channel on WAN-interface (eth1) to the IAX-provider (via gateway).

So... will this work :

route add -net ip_IAXprovider netmask gw dev eth1

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CentOS 5 Networking :: Errors On Network Interface

Sep 9, 2009

How to figure out why there are errors on bond0(eth0)

Transfer speed is in KB

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CentOS 5 Networking :: Can't See The Physical Network Interface With Ifconfig - A?

Jun 3, 2010

Centos el5xen x86_64 in a company network, novell-netware, Static IP I have several issues with the Xen network configuration. This configuration worked before, and was maded by a other personn with a higher level in centos and network . I'm trying to re-install xen in bridging mode.

1) The dom0 ping in the company network, but can't acess to the Internet.

I de-activated firewall, iptables and SE-Linux for the test.

the ifconfig-a command return
sit0 (IPV6 encapsuled in IPV4)
but no Peth0 Physical device

Is it normal and how can i repare this ?

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CentOS 5 Networking :: Dhclient Can't Get Default Gw On VLAN Interface

Jan 13, 2011

I have the following system

# cat /etc/redhat-release
CentOS release 5.5 (Final)
# uname -r

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CentOS 5 Networking :: Shutting Down Interface On Link Down State?

May 17, 2011

I have a problem. I want interface to shut down once there is a link down state detected. If you set up eth0, and then plug cable out, eth0 stays up, just loosing the RUNNING flag. I want it to go down completely.

I've stumbled upon netplugd, and I've tried using it. It is a daemon that detects states in (link up) and out (link down) from kernel netlink interface. If I have this daemon up, it detects that link is down (eg. cable removed from interface), and it runs correctly /etc/netplug.d/netplug eth0 out. That script then runs ifdown eth0. And that's ok.

But very next moment netplugd runs /etc/netplug.d/netplug eth0 probe, and probe section of that script runs "ip link set eth0 up", which then turns interface back on!I've tried commenting out that line, but then new problem occurs - after the link is up, netplug cannot figure that out and bring back interface. Has anyone have this kind of problem, and any viable solution with netplug?

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CentOS 5 Networking :: Redirect All The Traffic To An Ethernet Interface

Sep 12, 2011

Currently I have a server which runs under centOS 5.6. It is dedicated to the VoIP application of my customer.I have a problem for which I have the solution but I didn't managed to achieve it.So, let me explain you the context.Here is the networking aspects of my environment

VoIP Provider_____Gateway_____________My server
ADSL Provider____(non pingable)
x.x.x.2 <====> A.A.A.1 <======> A.A.A.3


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CentOS 5 Networking :: External Traffic Starts Going Over Internal Interface

Feb 16, 2010

I have a DELL running CentOS 5.4 with 2 active NICs, one with an external IP address (eth0) on 123.456.78.9 and another that is connected to our internal network (eth1), 192.168.2.x. When I reboot the server, everything works glowingly. External traffic is correctly routed over the external interface (eth0) and internal traffic over the internal interface (eth1). After some random amount of time, a couple of hours and sometimes a couple of days, all traffic starts getting routed over our internal network, so DNS requests fail, internet pages don't load, smtp connections fail, etc.

I'm assuming that everything that's not headed for our .1, .2 or VPN internal networks would go out the external interface. And why this works for a period of time and then stops working is beyond me. And when external traffic starts going over the internal interface, I just reboot and it starts working like it's supposed to again.

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CentOS 5 Networking :: Machine Hangs / Never Brings Down Interface On Downing Wlan0

May 20, 2009

I have managed to configure a wireles PCI card on CentOS 5.3 and it seems to work fine. It is a off brand (Hercules) with a Ralink RT61 chipset. I installed the most current driver (RT2501PCI/mPCI/CB(RT61:RT2561/RT2561S/RT2661) from the rt2x00 Open Source Project. I now have a question that might be very simple for one or more of you to answer. When I issue the command "shutdown -h now", the machine starts to come down and brings down eth0 cleanly, but when it attempts to bring down wlan0, the machine hangs and never brings down the interface OR powers off the box. The only way to complete the power off is to "hard" power off the machine.

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CentOS 5 Networking :: TIme Based Ethernet Interface Disable And Enable?

Mar 14, 2011

Im new to this Cent OS as well as Unix based Operating Systems. Please help me with the below requirement.My Company is a Serach based data collector from different websites like Google, Yahoo & many more..Collecting the data from the search engines is a issue for right now.. As many search engines are blocking us to search and retrive the date after some time.. Taking Google as example : Google Blocks my IP after every 30 mins of retriving.. Application is a Windows based & using Windows 2003 as the Server.. Would like to give a Dynamic IP to the Windows Server via 1st Ethernet Card & enable the 2nd Ethernet for the Internet..Eg : eth 0 = 1 = x.x.x.x (Public IP)I have check with few of my friends who told me to get Linux or Cent OS installed to do a interface disable after given time & enable a secondary device or virtual interface the next couple of seconds... Like eg : eth 1 = x.x.x.1 eth 2 = x.x.x.2 eth 3 = x.x.x.3 so on.. Would like the eth 1 to be down after 60 mins & eth 2 o be up & again after 60 mins of up time eth 2 down & eth 3 up.

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Ubuntu :: How To Get Distro Backup With Customized Menus

Nov 29, 2010

I want to make a distro backup but with my own customized menus (apps, places and system). So, what file from my home folder do I overwrite with what file?

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CentOS 5 :: GUI Interface On A VM Running CentOS 5.4?

Nov 16, 2009

root@vz03i106 [~]# yum groupinstall "X Window System" "GNOME Desktop Environment"

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: centosk2.centos.org


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Debian :: Customized Distro Aimed At Booting Very Fast?

May 4, 2010

I ask to linux experts if it is possible to easily create a base debian distro that allows wireless networking and synaptic utility (and the basical tools) aimed at booting very fast, from hard-disk or stick. After installation, it would be possible to install other stuff, not much in fact. It should be able to recognize the hardware and then boot without checking everytime.

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CentOS 5 :: How To See Interface

Jun 19, 2010

I had recently installed centos 5.5 on Distro.But I am not getting how to see interface.
I tried ifconfig and ipconfig both are not working.So please let me know what is command to see interface.

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Software :: How To Create A Centos Distro

Jul 3, 2011

Im looking to create my own centos distro.

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CentOS 5 Networking :: Getting Start W/ Centos Networking \ Ssh Commands But Not Setting Up A System And Stuff?

Feb 19, 2010

I just started setting up a linux box in the office...I have some experience with ssh commands but not setting up a linux system and stuff.The box is connected to our network but I have no clue how to make windows & osx talk with it. How can I go by doing that and also setting up an apache server to be able to connect through network. Right now I have apache/linux/mysql running it works when i go to localhost, but I would also like to let all the computers in office to access it. I would guess that will deal with virtual host which I know how to setup. I just need to setup an IP.

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CentOS 5 :: 5.3 - Can Use Any Graphical Interface ?

Jan 8, 2010

I've installed (well, I founded it installed yet in my new job...) Centos 5.3 (Final) version (kernel 2.6.18-164.el5 on an x86_64), but I only can work fron the command line. I don't know if I can use any graphical interface (I've worked with SuSe years ago and it start its graphical interface automaticaly when you reboot the system).

I have to configure sendmail. For it, I download and installed webmin and usermin and start them, but I don't know how to continue...

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CentOS 5 :: Can't Get An Graphic Interface

Apr 4, 2010

i'v installed centos 5.4 on vmware, but their is no graphic interface so i try: yum groupinstall "Gnome Desktop Environement" "X window System" but it says no packages in any requested group available to install or update the commande: yum grouplist gives me Trixboxcore actually avery time i try to do a yum install <package> it returns no package <available>

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General :: Which Is Closer To RHEL 5/6, 14, Centos 5.5 Or Another Distro

Nov 15, 2010

Which is closer to RHEL 5/6, Fedora 14, Centos 5.5 or another distro? In terms of installation and administration.

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CentOS 5 :: How To Access Router's Interface

Jun 22, 2010

I have my centos server behind a Linksys router. I'd like to access the router's web interface to open and close certain ports. How do I access the router's interface ?

Prior to this, I had a windows machine. I could type in the router's IP in in the browser and get access to the interface.

How do I go about now ?

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CentOS 5 Server :: FTP Web Interface For Clients?

Oct 19, 2010

At my work, we have several clients (outside clients) that have an FTP login to our FTP Server. Their login then leads them to their home FTP folder. The FTP server is currently a Win2003 box. Because we have so many clients, we would like to implement some form of WebGui that would allow each client to manage their own FTP home folder and user info, such as resetting their password if they lost it.

Is there anything like this available in linux that would provide us with that kind of control/usability?

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CentOS 5 :: Not Configured To Listen On Any Interface

May 18, 2011

I have tryed for hours trying to get this right but failed.I configure the dhcp file and when accepting the changes i get the error NOT CONFIGURED TO LISTEN ON ANY INTERFACE.

My file looks like this

Heres my current settings


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CentOS 5 Server :: Configure (which File) To Be Able To Send Email Out - From 5.3 Distro?

Jun 3, 2009

I'm not trying to setup a email server. ;) Firewall is set to disabled. SELinux is set to disabled.. How can i configure (which file?) the server to be able to send email out? When I try "mail -s testmail myemail@[URL]" and enter some text and then CTRL+D.. and return, I get command prompt again..


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