CentOS 5 Networking :: Centos 5.2 / Hyper-V/ Bridge With Synthetic Adapters Does Not Work?
Jan 27, 2009
I have a Centos 5.2 VM running under Windows 2008 Hyper-V. If I add two "legacy Nic's" and bridge them, everything appears to work fine. However, if I remove the legacy nics and replace them with two synthetic nics (linux integration components), the nics seems to function fine UNTIL I add them to a bridge.This VM will eventually be used as a DansGuardian/Squid transparent proxy for a local library. The logical layout is represented by the attached jpg image. I have also included the ifcfg- scripts for the adapters and bridge for both scenarios.It would also be useful if someone else has Hyper-V with the integration components and dual physical nics to see if they can reproduce my symptoms on their box.Legacy Adapters:
ifcfg-br0:
DEVICE=br0
BOOTPROTO=dhcp
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Apr 14, 2010
That the Linux bridge configuration does not work afer I upgraded the kernel to 2.6.33.2. Why I can't find the device vmbr0?
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Mar 26, 2009
I have been searching the forums for quite a while, to add extra Loopback adapter in Centos 5.1, but no success! Could you please suggest me the steps? in Windows, it is quite easy to add as many adapters as you want. wondering, if this is even possible in Linux? I have to run GNS3/Dynamips for router emulation and bind those Loopback adapters to virtual routers!
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Apr 10, 2009
I installed Xen package on a CentOS 5.3 x86_64. After a reboot I found the virbr0 bridge configured by default. I guess that "virbr0" is the name used conventionally by Red Hat to indicate the first bridge. In other Xen installations usually it would have named "xenbr0". I did not find in which configuration or script file it was created. How is it possible to remove that "virbr0" bridge?
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Jul 15, 2009
I'm running a CentOS 5.2 vm on a W2K8 hyper-v core server. The problem I have is that when I reboot, the system time always resets itself to 6:00 am in the morning. I tried the /sbin/hwclock --systohc command but it hasn't taken hold.
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Jun 27, 2009
This will be a little long (having read Phil's 'how to ask questions' FAQ). I'm trying to get OpenVPN working between my CentOS server and some Windoze laptops running XP. There seems to be plenty of sample
config files available, but to date, none of them have worked for me. Pulling out my trusty Wireshark, I've found some clues,
BACKGROUND:
My local subnet (NAT'ed by my gateway router) is 192.168.52.x. My router has been configured with a conduit (port-forward) for port 1194 (the standard OpenVPN port), which points towards my CentOS server.The CentOS server is .52.112, and the supplicant is .52.110. I have tried the lient both inside and outside my local subnet, with no difference in events or outcomes.
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Jan 18, 2011
I set up a bridge device but I can not figure out how to pass parameters into the ifcfg-vmbr0 in particular I need to pass:
maxage
ageing
fd and stp seems to be passed by DELAY=0 and STP=on the others? I have not found anything in the post, tips, docs how could I do?
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Dec 19, 2009
I have 2.6.18-164.2.1.e15 running on Hyper-v. I did yum update and noticed that kernel is upgraded to 2.6.18-164.9.1.e15. If I try to boot into the new kernel it hangs with message first "switchroot mount failed" and then "kernel panic". This is probably related to Hyper-v drivers installed in the old kernel. First question: Do you think this is correct? Is it possible to somehow disable Hyper-v drivers so I can boot into the new kernel and then reinstall drivers? There is nothing in Microsoft documentation about uninstalling Linux Integration Components.
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Nov 4, 2010
I've installed CentOS 5.x (64 bit) on a Hyper-V Server R2. When I trying to install integration serices I get an error:
[root@localhost ~]# cd /opt/linux_ic_v21_rtm/
[root@localhost linux_ic_v21_rtm]# make
Building all modules...
make -C /lib/modules/2.6.18-164.el5/build SUBDIRS=/opt/linux_ic_v21_rtm/src modules
make: *** /lib/modules/2.6.18-164.el5/build: No such file or directory. Stop.
make: *** [all] Error 2
I am using:
Linux localhost.localdomain 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
I did everything as it shows on [URL].
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Jan 2, 2011
My recent CENT OS install went very well. However the only thing missing is wireless support for my modest FR-300USB Wireless adapter. Since I do not have the expertise to create a driver I need to know where I can find what wireless adapters are supported.
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Oct 27, 2009
I know theres a thread for this for fc9 but thats probably kind of outdated now. So I am trying to set up a wireless connection for a pc in my bedroom and just want something that will work out of the box.
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Jun 3, 2010
I was searching for a doc on the exact steps to setup a bridge for use by my KVM setup. I needed my VMs to be bridge onto the eth0 network. Some docs I found on google seemed to be outdated.
[URL]
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Jan 12, 2011
I am trying to set up an unused machine as a web server for my students.
I originaly tried with Redhat 9 and had the same problems. I am using an HP Pentium 4 system with 2 network cards.
1) The built in Realtek RTL8139 configured as eth0.
2) An add in Broadcom BCM5782 Gigabit card that was added I presume when the built in card failed (we have a number of machines like this around the school), configured as eth1.
I did not realize the second card was installed when I had Red hat 9 on the system, but I discovered it after installing centos 5.5. I have tried to configure the system to use DHCP with and without getting the DNS from the provider, and both ways the system complains that there is no connection, check the cable, so it will not activate the device.
When I configure the device to use a fixed IP, I can configure the device, but I can't ping anything on the network other than myself. I suppose it is possible that both network cards have failed, but I get green link lights with both cards, when I connect them to my router, so I am at a loss as to why neither board seems to work. I don't have a spare network card to slide in because the computer takes a special mini card. Is there an easy way to test the board to see if the board is a problem?
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Jul 18, 2010
I did a fresh installation of centos 5.5. I installed KVM. And configured a eth1 for KVM host network and i configured eth0 to be bridged.
When i do service libvirtd reload i get: internal error Bridge generation exceeded max id 256
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Jun 9, 2009
any one are implementing Transparent Cache in bridge mode. after googling i found article but its not working for me. any one have done this before ? [URL]
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May 1, 2009
I just have CentOS installed and cannot get the Agere et131x network card to work.I have tried the following:Reboot the computer and still did not see the network hardware.
Fai
lspci
Quote:
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Jun 25, 2011
i have a centos 5 and i cant access to the LAN or Internet because , i cant create a network connection , i try to say My Ethernet dont appears,and i cant add any connections.i id thisTerminal:Quote:sudo iwconfig
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Dec 17, 2009
I`m looking for a a X-Window in CentOS. At the moment I work with console only in text mode
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Aug 12, 2011
It works fine when I boot into Win7 but in 10.10... Nothing..
ifconfig
Code:
eth0 Link encap:Ethernet HWaddr 00:16:76:13:16:44
inet6 addr: fe80::216:76ff:fe13:1644/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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I've read and read and tried just about everything out there.."If it works in WinX it should work in 10.10"... But it doesn't..
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Dec 19, 2009
I am eager to install GSN3 on CentOS 5 and work on GNS3. But i am unable to find a suitable easy guide to install the same. install GSN3 on CentOS.5 with rpm links if you suggest to download.
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Jul 4, 2010
i like to use my DVB-C Card KNC-One on Centos 5.5 x86_64. But i cant get it to work. on a 32 Bit Centos this is working like a charm. I tryed several different kernels together with the video4linux-kmdl
At the moment i am using this kernel: 2.6.18-194.3.1.el5.centos.plus
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Aug 10, 2010
where to find ODBC drivers for CentOS 5.5 to work with Perl 5.x (preferrably free)?
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Apr 5, 2009
I have just installed CentOS 5, and am new to Linux. So I don't know much about the terminal commands or much of anything else for that matter.
I'm able to get online when I plug an ethernet cable directly to the computer, but cannot get it to recognize my wireless(which I do have the drivers for, and did work previously on Windows).
The card is a Linksys WMP54GS.
I downloaded ndiswrapper-1.54 but still cannot figure out how to get this to run. As I said, I'm new, so I'm not sure what information other than that to provide, and how to access it, so you may have to guide me through that.
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Jun 8, 2009
I installed CentOS 5.3 Final on a machine today and was having some problems with the NIC. When I installed CentOs the NIC would not work, I looked in the network configuration and saw that neither of my two NICS had IRQ's so I arbitrarily gave them some and they both worked fine. I then ran yum -update, installed updates and rebooted my machine. Again, the NICs stopped working, only this time setting the IRQ did nothing. I did some googling and found this thread: [URL] The output from the first two commands is as follows:
[root@localhost ~]# uname -rmi
2.6.18-128.1.10.el5 i686 i386
[root@localhost ~]# /sbin/lspci | grep ther 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet (rev 10) 05:01.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet (rev 10) I followed the steps outlined and my issue still remains.
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Aug 25, 2009
im new at centos and i can't get my wireless to work. how do i get it to work?
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Nov 3, 2009
I have been a loving fan of your software for years now and have been trying to move into a new dedicated server, getting away from my VPS I have been anchored to. I had to change static ip's on my main internet line and thus got locked out of my server. I have the box here and I can console into it but I cannot get the new ip address to work. I have tried so many things it would waste more time than asking for the correct answer.
I know you are wise in the ways of the server as you have gotten me out of a jam in the past. I am currently running Centos 5.4 and a trial version of WHM/cPanel (which needs to be re-registered to the new address if I can ever get back online.)
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Apr 7, 2010
When I try something like, I get:
iptables -A FORWARD -p udp -m length --length 39 -m u32 --u32 '27&0x8f=7' --u32 '31=0x527c4833' -j DROP
iptables: No chain/target/match by that name.
So I re-compiled the kernel enabling WAN Router, and all the subsections. Downloaded latest iptables, removed the RPM one, installed the iptables from source.. Guess what, same error!
PS: iptables -m u32 -h works, it displays a page of info.
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Apr 15, 2011
Just moved from Ubuntu (via a couple of other Distros..) and cant get my wireless working.
lsusb returns: Quote:Bus 002 Device 002: ID 160a:3184 VIA Technologies, Inc. VIA VNT-6656 [WiFi 802.11b/g USB Dongle]
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Nov 29, 2009
By the way, is there a step by step guide to install XFS file system and other related components on CENTOS 5.3,
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Dec 8, 2008
I want to set up a bridge using bridge-utils within /etc/network/interfaces like is shown here in this guide: [URL] The problem is that, at the same time, I want eth0 to have a specific static IP address. Right now I have a configuration for eth0. This guide tells me that I should not configure eth0 outside of the br0 configuration.
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