similar to: Upgrade of CentOS and libvirt: need help on configuring network - Solved

I upgraded from CentOS 5.9 to CentOS 6.4. I try to reuse my virtual machines and am only partially successful: I can run them, I just cannot get the network OK and need some help with that. What I had in the past was pretty simple: both the host and the VM's used eth0 and each had an IP in the same subnet and could communicate freely. With the new install it seems somewhat more complex and I

Hi All, I have 2 NICS in this system. CentOS 6.4 eth0 is the virtual IP from PFSense mapping connected to the router, works fine. eth1 is a second NIC that I have assigned a private IP to and connected it to a switch on the private network. I have many other private devices, so I know this setup works. When I connect the cable to the switch and bring up eth1 the system basically stops taking

I am experimenting with routing tables to obtain a little understanding of how things work. I have a kvm hypervisor host (KVM1) with two physical Ethernet nics configured as bridges (br0 and br1). KVM1 br0 is configured with a public ipv4 address [x.y.z.42/24] and br1 is configured with a private ipv4 address [192.168.216.42/24]. A second kvm hypervisor, KVM2, is similarly configured albeit with

dear All, I'm facing this routing problem, the setup is actualy part of ltsp, but I think this problem is Centos-specific. The server is a Dell Poweredge R210. The install is standard 6.4, updated. I have one nic facing the public internet: vi /etc/sysconfig/network-scripts/ifcfg-em1 DEVICE=em1 BOOTPROTO=none HWADDR=d4:ae:52:c1:28:2b NM_CONTROLLED=no ONBOOT=yes TYPE=Ethernet

Hello, I want my CentOS 6.5 computer to have a static IP. Currently I get the IP I want because I have my router assign it on the basis of mac address. I placed the following file as: /etc/sysconfig/networking-scripts/eth0 DEVICE="eth0" BOOTPROTO=static HWADDR=00:1F:D0:9E:AE:67 ONBOOT=yes TYPE=Ethernet USERCTL=no IPV6INIT=no PEERDNS=yes NETMASK=255.255.255.0 IPADDR=192.168.0.99

i have create a system container test1 and trying to mount /dev/shm inside a container <domain type='lxc'> <name>test1</name> <memory>102400</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <vcpu>1</vcpu> <devices> <console type='pty'/>

Hello /etc/sysconfig/network-scripts/ifcfg-eth0 looks like this: # Intel Corporation 82545EM Gigabit Ethernet Controller (Copper) TYPE=Ethernet NAME=eth0 NM_CONTROLLED=no IPV4_FAILURE_FATAL=yes UUID=cc2635ff-3c14-48ba-b19a-84c5b9d36a9d ONBOOT=yes DEVICE=eth0 BOOTPROTO=none HWADDR=00:50:56:01:00:01 BROADCAST=192.168.0.255 IPADDR=192.168.0.10 NETMASK=255.255.255.0 NETWORK=192.168.0.0

Hello, when I have this in /etc/sysconfig/network-scripts/ifcfg-eth0 TYPE=Ethernet NAME=eth0 NM_CONTROLLED=no ONBOOT=yes DEVICE=eth0 USERCTL=no ... IPV6INIT=yes IPV6ADDR=2001:DB8:DEAD:BEEF::10 IPV6ADDR_SECONDARIES="2001:DB8:DEAD:BEEF::20 2001:DB8:DEAD:BEEF::30 2001:DB8:DEAD:BEEF::40 2001:DB8:DEAD:BEEF::50" IPV6_AUTOCONF=no IPV6_DEFAULTGW=2001:DB8:DEAD:BEEF::1 IPV6_DEFAULTDEV=eth0 I

Hi all, we are testing CentOS 7 in order to migrate from Scientific Linux 6 / CentOS 6 and we are facing an issue with the network. Trying to configure network with teaming in activebackup mode or also with bonding in mode=1 (active backup as well) we see many RX dropped packets in the bond0 interface (around 10% of the total), 100% RX drops in the backup interface and 0% in the active interface.

> Date: Monday, October 03, 2016 22:00:07 -0400 > From: TE Dukes <tdukes at palmettoshopper.com> > >> From: Gordon Messmer >> Sent: Monday, October 3, 2016 4:25 PM >> >> On 10/03/2016 04:54 AM, TE Dukes wrote: >> > I can get the guest to access the internet but have tried every >> > was possible to be able to access the guest from the LAN

Hi, I hope someone can help me, I cannot seem to get a system's ethernet interface to correctly work in promiscuous mode... I have a Centos 6.4 system with 2 bnx2 interfaces on it. I have set up eth1 in promiscuous mode and am sending traffic to it using the port mirroring configuration on a Nortel 3510-24T switch. The switch reports that it is sending a fair amount of traffic to the

CentOS-6.10 We have a host with the following ifcfg file contents: BOOTPROTO=none BROADCAST="" DEFROUTE=yes DEVICE=eth1 . . . GATEWAY=X.Y.Z.234 IPADDR=A.B.C.2 IPV4_FAILURE_FATAL=yes NAME="LAN Link - eth1" NETMASK="255.255.255.128" NETWORK="A.B.C.0" NM_CONTROLLED=no ONBOOT=yes PREFIX=25 TYPE=Ethernet USERCTL=no And an aliased ifcfg containing this:

Dear Centos-Virt: This is actually a second request for help on the same issue. I finally got to try what several months ago was replayed to me and no joy was to be had. I am afraid the original thread got stale and also had extra, unnecessary data in it. Guest=XP Pro, SP2 Host=CentOS5; # uname -r; 2.6.18-8.1.15.el5 VirtualBox-1.5.0_24069_rhel5-2.i586.rpm

# Set everything else to deny all other network access (debug=1): $tbls -A dsl-for -j LOG --log-level $debug --log-prefix "dsl-for Everything Else " $tbls -A dsl-for -j DROP packets originating on my VLAN (eth0.5) destined for the Internet get logged with their IN/SRC, OUT/DST logged backwards. For instance, this is Cobian Backup (http://www.cobian.se/cobianbackup.htm) on my Windows

Hello, I'm trying to set up IP aliases within a QEMU/KVM guest on CentOS 5.5 x86_64, going through a bridged virtualized interface. The virtualized interface in the guest is configured as follow: # ifcfg-eth1 DEVICE=eth1 BOOTPROTO=none PEERDNS=yes GATEWAY=IP.OF.HOST.GATEWAY HWADDR=11:11:11:11:11:11 IPADDR=IP.OF.GUEST.ETH1 NETMASK=255.255.255.255 ONBOOT=yes ARP=yes USERCTL=no IPV6INIT=no #

Hi all, Read many posts on the subject. Using 802.3ad. Few problems; Cannot ping some hosts on the network, they are all up. Cannot resolve via DNS which is one of the hosts that I cannot ping, internal nor external DNS hosts. Unplugging the NICS and plugging them back in will then not allow pining if the default d=gateway. When cold booting it somewhat works, some hosts are pingable while

I've spent some hours on this without success - any help greatly appreciated. I've just done a new RHEL6 setup, with a KVM guest (first time). The basic installation works fine until I start libvirtd; at this point, the host machine loses access to the external network: step 1: ping from host to network works; external machine on network can ping both eth0 and br1 on the host step

> -----Original Message----- > From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On > Behalf Of Gordon Messmer > Sent: Monday, October 3, 2016 4:25 PM > To: CentOS mailing list > Subject: Re: [CentOS] Virtualization Networking > > On 10/03/2016 04:54 AM, TE Dukes wrote: > > I can get the guest to access the internet but have tried every was

Hi, I have an eth0 interface (it's a CentOS 6 guest VM on a KVM host) which is configured as follows (see below) with a primary public IP address of xxx.xxx.xxx.130 (which works fine). I cannot set an alias IP address. I want eth0 to also use another IP address (xxx.xxx.xxx.131, so I create /etc/sysconfig/network-scripts/ifcfg-eth0:1. Then: # service network restart Shutting down

Hi, I have a Centos7 host with libvirt, attempting to boot a Centos7 guest. I am attempting to do the install over ipv6 (because why not). I have the following network configuration. Cisco 3550 gi0/1 <-> eno1 (Centos7) host. gi0/1 is configured as: switchport trunk encapsulation dot1q switchport trunk allowed vlan 1-17 switchport mode trunk Mainly in question is vlan11 as this is