similar to: Starting libvirtd cuts off host access to external network

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

I've made 3 CentOS 7 installation attempts to configure a simple firewall/router box with 2 nics. I got myself into a circular scenario where NetworkManager and firewalld and /etc/sysconfig/network-scrpts/ifcfg-***** were interfering or overwriting each other. Needed to perform ifdown enp3s7 on the internal LAN nic in order to make the external internet enp2s0 reach websites and ping

On my CentOS 6 partition of my laptop: First note that for this test, NetworkManager is not running because I did: chkconfig --del NetworkManager and then rebooted. Here is my ifcfg-eth0: DEVICE="eth0" NM_CONTROLLED="no" ONBOOT=no HWADDR=xx:xx:xx:xx:xx:xx TYPE=Ethernet BOOTPROTO=none IPADDR=192.168.2.5 PREFIX=24 GATEWAY=192.168.2.1 DNS1=192.168.2.1 DNS2=192.168.2.1

Hi Felix > Dear Simon, > > every second IP-address is unwanted. We restarted? eno4: > > nmcli con down eno4; nmcli con up eno4 > > and the second address vanishes. Then after a few ours, the second ip > address reappears. That's really interesting. Doesn't NetworkManager also store other settings in a different location, not the ifcfg files? I think it does so and

> Dear Simon, > > >> And can you diff the config of eno1 and eno4. > > # pwd > /etc/sysconfig/network-scripts Okay, nothing to find here. What about eno2, you also have two IP addresses there and even in the same subnet, is this wanted or not? Can the second address of eno2 be found in the ifcfg file? Both eno2 and eno4 have "scope global secondary dynamic"

Dear Simon, > And can you diff the config of eno1 and eno4. # pwd /etc/sysconfig/network-scripts # diff -u ifcfg-eno1 ifcfg-eno4 --- ifcfg-eno1??? 2020-09-21 17:23:25.576672703 +0200 +++ ifcfg-eno4??? 2020-09-22 07:18:43.160532532 +0200 @@ -3,15 +3,20 @@ ?BROWSER_ONLY=no ?BOOTPROTO=none ?DEFROUTE=no -IPV4_FAILURE_FATAL=yes -IPV6INIT=no -IPV6_AUTOCONF=no +IPV4_FAILURE_FATAL=no

Weird behaviour. A couple of days ago I installed another DSL router. During the process I have somehow caused the default gw route to disappear - on system start up the interface comes up fine, I can see and connect to the local subnet but not to the internet. [rkampen at timsws network-scripts]$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref

> -----Original Message----- > From: Gordon Messmer > Sent: Monday, August 31, 2015 12:15 PM > > On 08/31/2015 03:51 AM, Jason Pyeron wrote: > > I feel like this is an issue of libvirt starting before networking, > > but I am a fish out of water with systemd. > > Are you using the "network" or "NetworkManager" service to > configure your

Dear Simon, every second IP-address is unwanted. We restarted? eno4: nmcli con down eno4; nmcli con up eno4 and the second address vanishes. Then after a few ours, the second ip address reappears. This is the config-file of eno2: # cat ifcfg-eno2 TYPE=Ethernet PROXY_METHOD=none BROWSER_ONLY=no BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes

Hi; I have a CentOS 6.8 x86_64 server where just run Oracle 11g 64 bit data base server. Is happen that sometimes it loose all connections (no ping, I can not access via ssh, no TNSping of Oracle server have success). When this happend I make ping from this server to some IP address of my network and then everything work fine again. I check logs looking for some mistake or problem in the network

On Feb 20, 2017 2:42 PM, "Rommel Rodriguez Toirac" <rommelrt at nauta.cu> wrote: Hi; I have a CentOS 6.8 x86_64 server where just run Oracle 11g 64 bit data base server. Is happen that sometimes it loose all connections (no ping, I can not access via ssh, no TNSping of Oracle server have success). When this happend I make ping from this server to some IP address of my network and

On 20/09/2019 04:55, Carlos A. Carnero Delgado wrote: > Hi! > > I just upgraded a machine to 7.7.1908 and the default route is not being > set on boot. This particular server has a bonded interface, and the > corresponding configuration for the master is ( > /etc/sysconfig/network-scripts/ifcfg-bond0): > > TYPE=Bond > BOOTPROTO=none > DEFROUTE=yes >

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

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:

On 4/28/2020 4:22 PM, Chris Adams wrote: > What's in /etc/sysconfig/network-scripts/ifcfg-<name>? I wonder if you > have IPv6 disabled. Pasted below. V6 definitely works. I have a second server and gave it a WAN address and I can connect between them using their WAN addresses. That's what told me that my ip6tables weren't screwed up and that the problem lay elsewhere.

Hello, I?m trying to configure a CentOS 7 server to act as a host for a bunch of virtual servers (KVM). I have an 802.3ad bonded Ethernet connected to the server with a bunch of tagged VLANs. I want to be able to build a bridge interface on the server for each VLAN and then attach that to the bond interface and the virtual clients. I also want to attach a host interface to one of the VLANs

Hello Am Friday 11 December 2015, 10:13:00 schrieb Gordon Messmer: > On 12/11/2015 06:04 AM, G?nther J. Niederwimmer wrote: > > I have 4 NIC on all my KVM Servers but the most time on a start (restart) > > I > > lost one NIC? It is not always the same, but this two are virtio NICs. > > > > with ifup eth0(1) the system say,I have no configured eth0 or eth1 file ?

Hello, I have a CentOS 7.3 + updates server where my configuration arises from the need to connect via iSCSI to a Dell PS Series storage array and Dell not supporting bonding. So that I need to use 2 nics on the same vlan to connect to iSCSI portal IP and then use multipath. Also, the iSCSI lan is on a dedicated vlan I have only these 2 x 10Gbit adapters and I also need to put other vlans on them

We use a dual homed CentOS-6.3 host for our Internet gateway router. Its internal nic (eth1) is configured such that the address 192.168.0.1 is one of its aliases. # cat /etc/sysconfig/network-scripts/ifcfg-eth1:192BOOTPROTO=none BROADCAST=192.168.255.255 DEVICE=eth1:192 IPADDR=192.168.0.1 IPV6INIT=no MTU="" NAME="LAN - Non-routable" NETMASK=255.255.0.0 NETWORK=192.168.0.0

Hello All, I'm installing some DIY routers, composed of Intel nuc's ,Linksys usb-ethernet adapters and Centos7 On most machines I just plug in the usb device, install Centos7 and everything works. But on this one machine the network interface doesn't work. After installing ip addr shows: [root at clgmol ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue