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
DEVICE=eth1
HWADDR=00:24:81:E4:FC:02

[code]....

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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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OpenSUSE Network :: Xen Networking Without Bridging

Mar 5, 2010

you can do secondary interfaces (virtual interfaces?) for your virtual machines (domU's) and not loose your eth0 to the bridge. Is there documentaion on Xen in OpenSUSE without bridging?

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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 10.20.40.104 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:10.20.40.105 Bcast:10.20.40.255 Mask:255.255.255.0
inet6 addr: fe80::21e:c9ff:feee:5a91/64 Scope:Link

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Fedora Networking :: Does Network Manager In F15 Support Bridging

Aug 24, 2011

does Network Manager in Fedora 15 support bridging and if so, can you configure the bridge using your wireless interface? All of the information I've come across so far said that you can NOT create a bridge using a wireless interface, and that Network Manager doesn't support bridging, but this info was also from Fedora 12 and below, so I don't know if it's still relevant for Fedora 15. I would certainly hope that by now you can make a bridge from a wireless interface. Even the lowly VMware Player offers this option.

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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.

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]....

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Fedora Networking :: F13 VPN / Network Conflicts - Cannot Browse Internet

Sep 20, 2010

I'm using VPNC to connect to a remote cisco network, however I cannot browse the internet after the tunnel establishes. I know this is a DNS issue, as I can ping external address by IP (e.g. google). I can also communicate through the VPN tunnel without trouble.

/etc/resolv.conf gets updated by the VPNC with the remote networks DNS Servers, but I still cannot connect to the internet. I even manually tried to add my local nameserver to the /etc/resolv.conf file, without luck.

Also, just as a side note, I can only establish the tunnel via the command line "vpnc" command. I'm using Fedora 13 with KDE, but knetworkmanager / networkmanager will not establish the tunnel, however I haven't really dug very deep as to why. I've just setup some vpnc config files for loading the various connections manually, as needed.

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Ubuntu :: 10.10 - Apache ETC And Network Bridging

Feb 24, 2011

I'm a web developer etc. Came from using Windows - Love Ubuntu, alot. I installed Apache, PHP5, MySQL etc. Where can I access the htdocs? I've searched everywhere for the index file, but I cannot seem to find it. Now, my second question is. How can I bridge my connection from my wireless to my xbox 360? It was relatively easy on Windows 7 (however it is my native OS, had it since I was a kid). But since I'm new (today) to Ubuntu, I have no Clue What to do.

Also, the dns servers are like, 10.x.x.x.x - However on my router it's 192.168.2.1, for both 1 and 2. On my xbox, when I had it bridged from my laptop to my xbox (on 7), it worked fine while manually setting ip and DNS servers to that of my laptop, however if I use the same settings for my xbox with Ubuntu, it will say can't connect using a static IP, then when I auto define the settings, the IP works etc, but the DNS servers cannot communicate with xbox.com. (Even if I leave them as 192.168.2.1).

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Debian Configuration :: Network Namespace Bridging

Jan 27, 2016

My task is to create network namespace, so it can be used to perform some other tasks from it.

Debian 8.2 is used in VMWare virtual machine on windows 7. I have also tried same things with Raspbian on Raspberry Pi 2, but same problems appear.

First, i have followed tutorial https://lwn.net/Articles/580893/ to create pair of virtual ethernet interfaces.

Now i have veth0 in global namespace with ip address 10.1.1.2/24, and veth1 in netns1 namespace with ip address 10.1.1.1/24, and i was able to ping each one from another

Next, i have followed tutorial [URL] ..... to bridge eth0 and veth0, so i can access internet from netns1 namespace.

- First, i have deleted ip addresses for both eth0 and veth0
interfaces, and set them do DOWN state.
- New bridge is created (br0) and both interfaces (eth0 and veth0) are
added to it.
- Then both interfaces are set to UP state, and i run "dhclient br0" to
assign ip address to br0.

From global namespace now it is possible to run "ping google.com" (and br0 interface is used), but from netns1 namespace i get error "Network is unreachable".

$ ip addr show
Code: Select all    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
        inet 127.0.0.1/8 scope host lo
           valid_lft forever preferred_lft forever
        inet6 ::1/128 scope host
           valid_lft forever preferred_lft forever
 
[CODE]....

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General :: Bridging Network Interfaces Hangs On Getting IP

Aug 14, 2011

I have two physical NICs (eth2 & eth3) with eth2 connecting to the home router/dhcp server and eth3 connecting to another machine which needs access to the internet. I'm trying to create a bridge so that the second machine on eth3 can be connected on the lan. I've tried the following, however it hangs when attempting to get an IP address from the router. Likewise, attempting to give it a static route doesn't seem to work either.

$ sudo aptitude install bridge-utils
$ sudo ifconfig eth2 down
$ sudo ifconfig eth3 down
$ sudo brctl addbr br0
$ sudo brctl addif br0 eth2 eth3
$ sudo dhclient br0 # this hangs and fails to get a dhcp address

I've tried to ensure my routing table mimics what it looks like when using eth2 normally, I cannot hit the gateway at all.

$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 2 0 0 br0
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 br0

I attempted an 'arping' to the MAC address of the router while I had eth2/3 bridged, but it failed to obtain it's IP address as well. One interesting thing I noticed was that attempting to bring down the bridge & reactivate my internet on eth2, I was having trouble pinging the gateway. It turned out 'ipmasq' had been installed and was running causing odd problems. When I stopped the ipmasq service, my internet started working properly again. I removed the 'ipmasq' package entirely and tried bridging the NICs again thinking it may have been causing problems, but it still failed.

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Slackware :: Bridging Two Network Interfaces On The Same Motherboard?

Oct 5, 2010

Just recently set up a Slackware 13.1 partition. I'm really enjoying how it works so far, but I have one problem I just can't seem to find the right solution to, and was hoping for some assistance. Here is the basic setup. The Slackware box has eth0 connected to my wired router, and eth1 goes to an xbox running Xbmc. What I require is that the Xbox gets it's own DHCP IP from the router. In other versions of Linux I accomplish this by using bridge-utils. In Arch Linux I accomplish this by having this in /etc/rc.conf:

Code:
eth0="eth0 up"
eth1="eth1 up"
br0="dhcp"
INTERFACES=(lo eth0 eth1 br0)
and this in /etc/conf.d/bridges:

[Code]...

I know I'm close here, but I just can't get it to bring the network up with the bridge by restarting the networking, or rebooting.

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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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Fedora :: Rebuild: Cannot Rebuild From Current State

Nov 21, 2010

When trying to rebuild a RAID1 on a FastTrak TX4310 controller after a disk was replaced the below message is given:

Code:
[root@SAMBA Samba]# dmraid -R pdc_gigcjhdfa /dev/sdc
Volume "pdc_gigcjhdfa" is not in rebuild state (current: 16)

Rebuild: cannot rebuild from current state!

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CentOS 5 :: Rebuild The 2.6.18.-128.e15 Kernel In 5.3?

Jul 18, 2009

I want rebuild my 2.6.18.-128.e15 kernel in CentOS 5.3? but i have one trouble. When i type make bzImage I see

make[1]: *** No rule to make target `init/main.o', needed by `init/built-in.o'. Stop.
make: *** [init] Error 2

on the screen. It is because kernel sourse codes are not full. I can not search full sourse codes of 2.6.18.-128.e15 kernel.not in src.rpm , not in tar.bz2 etc.

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CentOS 5 :: Update To 5.3 Have Some Packet Conflicts?

Apr 1, 2009

I tried to update from 5.2 to 5.3. But I got the error message:

Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test

Transaction Check Error: file /usr/lib/gstreamer-0.10/libgstqtdemux.so from install of gstreamer-plugins-good-0.10.9-1.el5_3.1 conflicts with file from package gstreamer-plugins-bad-0.10.3-8.el5.rf file /usr/lib/gstreamer-0.10/libgstvideo4linux2.so from install of gstreamer-plugins-good-0.10.9-1.el5_3.1 conflicts with file from package gstreamer-plugins-bad-0.10.3-8.el5.rf

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CentOS 5 :: Yum Update Failed Now Having Conflicts

Sep 19, 2011

I was trying to do a yum update and it hung on me so did a killall -9 yum. Now I go back to rerun the update.

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OpenSUSE :: Rebuild The System Update Database?

Aug 30, 2010

how to rebuild the system update database?

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General :: Rebuild System From Dump Tape?

Feb 8, 2010

I have a Red Hat Enterprise (AS) 4.8 system and I need to know how to totally rebuild the system from dump tape. I have been making some full level 0 dumps of the system to the attached DAT72 tape drive... In the case the boot disk goes south, I need to reload from tape, onto a new disk drive. I know how to do this in Solaris. I assume you boot from CD to like a mini-root, then configure and mount the drive on temp mount points, restore the sys data, then load the "boot blocks" (like installboot on solaris).

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CentOS 5 :: How To Rebuild Sofware Raid

Apr 6, 2009

I've got a server running a software Raid for SATA disks on a P5E motherboard.

I had to had a lot of memory on thi sserver, then I have had to flash the bios. This has resetted the software raid on the disks, then when I boot, i got a Kernel Panic cause it doesn't find anything ...

how to rebuild the raid ? I can boot on a live cd, or anything else, but don't know how to do it without loosing my data.

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CentOS 5 :: Rebuild Just One Part Of The Kernel?

Nov 13, 2009

I'm working on the development of a custom kernel (actually just a "small" change in the networking part), from the standard 2.6.23.17 source code (downloaded from kernel.org), on CentoOS 5.3. I'm using the following procedure to build and install the kernel:

1)cd <ROOT_DIRECTORY_OF_KERNEL_SOURCE>
2)Modifiy the 4th line of the Make file as follows:EXTRAVERSION = .17CUSTOM
3)make clean && make mrproper
4)make menuconfig
5) make rpm

[Code]...

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CentOS 5 :: Rebuild The Live Cd 5.5 To Add Some Application?

Oct 25, 2010

I would like to rebuild the live cd 5.5 of centOS to add some application. I am looking for source code to rebuild live cd 5.5.

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OpenSUSE Network :: 11.4 / Nfs Server Conflicts With Vboxdrv?

Mar 17, 2011

I can't start NFS server anymore. I get the following message:

"insserv: FATAL: service syslog is missed in the runlevels 4 to use service vboxdrv"
"insserv: exiting now!"

Is it vbox conflicting with nfs server?

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Software :: Preventing Dependency Conflicts - CentOS 6

Aug 3, 2011

I've recently installed cacti on one of my servers and grimaced a bit when I had to install additional third-party yum repositories for CentOS 6. My question is, how does one go about preventing potential conflicts with certain dependencies overwriting key/critical dependencies relied upon from packages that might share them, i.e. apache? I understand yum priorities and have read the discussions regarding pros/cons from the threads involving one of the YUM maintainers. Since I need my servers to act as production-class equipment and, hence, be as reliable as they can, I'm always hesitant to allow yum to automate package upgrades when third-party repos are involved. How best to handle this?

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CentOS 5 :: Upgrading From 5.5 To 5.6 - Conflicts With File Error

May 13, 2010

I issued "yum update" and the process ended with a transaction check error(see below).
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test

Transaction Check Error:
file /usr/share/backgrounds/images/default-5_4.jpg from install of oracle-logos-4.9.17-6.noarch conflicts with file from package desktop-backgrounds-basic-2.0-41.el5.centos.noarch
file /usr/share/backgrounds/images/default-dual-wide.jpg from install of oracle-logos-4.9.17-6.noarch conflicts with file from package desktop-backgrounds-basic-2.0-4
[code]...

I installed Oracle Database on this server few months ago. I see in /etc/yum.repos.d directory a public-yum-el5.repo file with entries pointing to Oracle which must have come from that installation. Now how do I proceed from here?

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CentOS 5 :: What Does Rsyslog (using Yum) Install And How To Handle Conflicts With Syslog

Aug 21, 2009

I am thinking about installing rsyslog using yum, but I only want to try it out first and don't want to create conflicts and problems that will be hard to revert. When I ask yum on CentOS 5 about rsyslog, I get this (note much older version - it's too bad that even the latest STABLE rsyslog isn't in the repository):

[Code]....

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CentOS 5 :: Nvidia Driver Rebuild Necessary After (each) Kernel Upgrade?

Oct 6, 2010

I have an Nvidia graphics card,... actually I manage several workstations that run centos and have an nvidia video card. I also have a personal computer with ubuntu and an nvidia network card.

I would like to do a regular automatic update of those Centos workstations. (With a pilot group to test and then a full roll-out). Until oktober 2009 no major difference in automatic updating ubuntu and centos (apart from the differences between apt and yum):

After a kernel upgrade, the systems can not boot into it's Xorg gui, because the nvidia driver must be rebuild (=not recompiled, because this is partially object code, the driver is not opensource).

But from ubuntu 9.10 onwards, the kernel update process checks for the presence of propietary drivers like those of nvidia and does a rebuild on the reboot, so that the system can succesfully boot into the xorg GUI (and gdm or kdm) My question is: Are ther any plans for Centos to do the same, this would relief me from some upgrade hassle for the Centos workstations that I manage. Or does anyone know about a (good) automagic workaround?

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CentOS 5 Server :: Random Auto Rebuild Of Software Raid ?

Jan 16, 2010

I have set up a software raid 5 and a software raid 1 on the same 3 disks.

But my problem is, every couple of days the software raid starts automatically resyncing. This resync is always succesful.

I do not know why this happens, any ideas to troubleshoot this further? I can not see an error in /var/log/messages

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Fedora Networking :: Don't Seem To Get Our Bridging With Protocol

Jul 12, 2011

We are running in to a issue where we don't seem to get our bridging to work as we expected. Meaning passing all traffic from Point A to Point B. As explained below:

[Code]...

This is the original connection. Now we are adding our Linux IP impairment box for IP tables in between Application Server A and Router X so the figure would look as below: Application Server A --> IP Impairment box --> Router X --> router Y --> Application Server B

The issue we are having is When a packets are sent from Server A to Server B they are going through for PING, TCP, UDP, but for BGP the connection is established at a TCP level (SYN, SYN-ACK, ACK), but the BGP OPEN packet does not get through and our BGP relation ship does not come up between Application Server A and B. Application Server A and B are a routers also but there are applications running on those router. BGP is underlying protocol used for Application Server A to be talking with Application Server B and getting routes for each other.

Even with the iptables empty (all rules default ACCEPT) we still can't seem to get these BGP OPEN's through. We see both sides of the application servers sending BGP OPEN's, but the Linux bridge never passes those packets to the other side of the bridge. Tracking the BGP packets, we see the packets at iptables raw PREROUTING and filter FORWARD tables but the packet doesn't get out the other interface.

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Networking :: HDLC To Ethernet Bridging?

Aug 17, 2010

Have upgraded HDLC version for 2.4.20 kernel from 1.02 to 1.14. And recompiled the kernel and HDLC driver. Also it requires sethdlc utility for configuring HDLC and driver parameters which was found on the internet where the patch for HDLC was found. Having done that with kernel and driver reloded, when you try to configure HDLC interface for HDLC and physical parameters as follows:

#sethdlc hdlc0 hdlc nrzi no-parity

error is thrown

hdlc0: Unable to set HDLC protocol information: Operation not supported.

Currently the driver doesnt support configuration of physical parameter.

But can you configure the HDLC protocol parameters for the interface having modified the HDLC version in the kernel 2.4.20. Basically the HDLC interface has to be configured and bridged with existing Ethernet interface using Brctl utility.

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Networking :: Bridging Configured But Not Working?

Jan 17, 2011

I have configured bridging based on information from a few web pages Google found. Traffic is being seen (using tcpdump) on both interfaces that are configured. However, the traffic is not going between them. What could be missing?The bridging machine has 3 NICS: eth0, eth1, eth2. eth0 is configured normally with an IP address (I can login via ssh to it just fine). The bridge is named br0 and uses eth1 and eth2 (a dual NIC card for convenience identifying which NICs are the bridge).

A script executes these commands:
Code:
bash-4.1# /etc/rc.d/rc.bridge-up br0 eth1 eth2
EXECUTING brctl addbr br0

[code]...

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