0
votes
0answers
9 views

Local DHCP to setting up Nimbus cloud networking

I'm currently trying to install the Nimbus cloud in two machines (centOS 6) test environment inside the department/university network. The problem is that I can't install directly a DHCP server and ...
2
votes
0answers
21 views

How to setup multiple OpenVPN connections on a server for a single localhost app to use on CentOS 6.5?

I have a scenario where I need to run several OpenVPN connections at one time and to allow a singular application to access each of these connections. How wold I go about starting up several ...
2
votes
1answer
103 views

Poor network performance with KVM (virtio drivers) - Update: with vhost_net

I've set up several KVM based networks before, and never encountered this issue, can't for the life of me think what I'd have set up differently previously. Setup Basically, Ive got and entirely ...
0
votes
0answers
46 views

CentOS Host KVM Virtual Machine running a Windows VM - No internet access

I've installed a KVM virtual machine on a CentOS host using libvirt. I've also set up a bridged connection from the interface en0:4 running on IP x.x.x.15 to br0. (The IP is a public one). Running ...
26
votes
3answers
2k views

Is it safe to reboot a server open to the internet?

Specifically I have an iptables ruleset defined on a server running CentOS. Am I guaranteed / can I guarantee / how can I guarantee that when networking comes online (either at machine boot, or after ...
3
votes
1answer
70 views

Device eth0 does not seem to be present on new kernel with virtualization modules loaded/compiled on kernel 3.15.6

cat /etc/udev/rules.d/70-persistent-net.rules SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:5D:02:14:22", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" ...
1
vote
1answer
78 views

Hyper-v Virtual Network Switch Configuration

I have Hyper-v Running. What I am trying to do is setup a CentOS firewall box which will forward all traffic to the 2nd VM CentOS box which has an internal adapter and only seen by the 1st VM ...
1
vote
1answer
67 views

TLS Error on OpenVPN

Client: OpenVPN 2.3.4 64bit (Works fine connecting to my pfSense at home) Server: OpenVPN 2.2.2 installed via yum Followed this guide: ...
-1
votes
1answer
57 views

Unable to connect to localhost or local ip but can connect to other servers or websites

I have a server with nginx|bind|mysql installed, everything is working fine but I am unable to connect to localhost or any websites hosted on server. I tried pinging and wget and none of them work ...
4
votes
4answers
222 views

Centos server keeps jumping to address instead of static assigned address

I have a headless Centos server that I've configured with a static IP address. I've disabled Network Manager, avahi-daemon etc. Whenever I restart the network it just jumps to 10.155.90.100 instead of ...
0
votes
0answers
32 views

Access VM from network

For my PHP-development I have VagrantBox running CentOS. This box however is only accesible from my own computer because it only has a NAT-interface and a Host-Only-network. But when I want to test it ...
0
votes
1answer
48 views

Unable to get out of rescue mode after a spontaneous reboot

I am experiencing a weird problem where the CentOS 6.5 system I was using spontaneously underwent a restart that was not authorized by me, and then enters Rescue Mode, where I am unable to diagnose ...
1
vote
0answers
207 views

Improving TCP performance over a gigabit network lots of connections and high traffic for storage and streaming services

I have two servers, Both servers hardware Specification are Processor : Dual Processor RAM : over 128 G.B Hard disk : SSD Hard disk Outging Traffic bandwidth : 3 Gbps network cards speed : 10 Gbps ...
0
votes
1answer
57 views

server listening on loopback IP

I have a barracuda load balancer and a VIP which in turn forwards to a cluster of servers. Each of these servers has the VIP added to the loopback interface as the load balancer is on direct server ...
2
votes
1answer
97 views

Linux IP forwarding trouble

In my environment most of the servers have 2 network cards. A primary/user network card used by the application, and a secondary/backup adapter used for backups, bulk copies etc. I just set up a ...
-2
votes
1answer
72 views

Streaming Server Network Performance [duplicate]

I have server Linux based on centos 6.5 final 64bit , ram 128 G.B dual E5-2650 processor Hard disk : 4 SSD Hard disk RAID-5 Network Speed 1/Gbps Bandwidth Speed 500/Mbps up to 3/Gbps My ...
1
vote
0answers
47 views

Poor large transfers behind NAT on Centos

I have the following set up. A Centos 6.5 VM running on an ESX host, with a public IP4 address. It is acting as a gateway for (a bunch of) other Centos 6.5 VMs that are only connected to a virtual ...
-2
votes
1answer
249 views

CentOS 6.5 Connections drop randomly [closed]

I have a CentOS 6.5 installed on my ESX as a virtual server. When I working with my server via SSH (or any other connection on any other port), sometimes I lost any type of connection to my server for ...
0
votes
1answer
119 views

Why does installing vzctl on a fresh Centos6.5-minimal break network connectivity?

I seem to have encountered a bug in vzctl's installation. Upon installing it in a clean CentOS6.5-minimal installation according to the official wiki, network connectivity is limited to pinging IP ...
0
votes
0answers
49 views

Asterisk virtual machine stops responding to network connections when I connect with Phoner Lite

I've installed Asterisk Now with PreePBX from bootable CD to a VirtualBox machine. Then I updated through FreePBX all the modules available for update and noticed a strange behaviour: After I ...
0
votes
1answer
59 views

httpd: multiple IP addresses, go to the same location

I've been looking into this for about 30 minutes now and don't really know of any easy way around this. What I'm wanting to do is allow Apache to listen on all interfaces (this should already be ...
2
votes
2answers
708 views

xen creating a new virtual machine with bridge networking

I am using CentOS 6.5 64 use this tutorial to setup Bridge [root@CentOS ~]# brctl show bridge name bridge id STP enabled interfaces xenbr0 8000.08002754b3fa yes ...
-1
votes
2answers
2k views

CentOS 6.5 not bringing up network interface automatically after reboot [ifup eth0]

I am having this issue with many of my CentOS servers where after a reboot the network interface fails to come up automatically. This is a big problem for me since I need to drive to the datacenter ...
-1
votes
1answer
408 views

Two NIC (eth0,eth1), two global IP on same subnet. Became unreachable to IP on eth1 after reboot

I configured a CentOS 6.5 virtual server and deployed it to a remote VMware vSphere environment. We needed two IP address, so I added a virtual NIC and assigned a second IP on eth1. I didn't ...
-2
votes
1answer
214 views

How to access device on switch from another computer? [closed]

I have several computers all connected to the same switch. Some computers are running RHEL, one is running CentOS. The CentOS machine is connected with NIC 2 to switch 2, and NIC 1 to switch 1. The ...
-1
votes
1answer
67 views

How to add Public IP to Cent OS [closed]

I am trying to configure a Public(Static) IP in Cent OS 6.4. For this, I made a copy of eth0(added local IP, so that I can connect the system to Internet) and named it to eth0:0(added Public IP, so ...
0
votes
2answers
113 views

IP Link keeps resetting to down

Recently I moved a server (Linux centos 6.5) to a new server. I don't know about the hardware I don't own the servers. However, when I did that(I've noticed this on linux in general with VMs and more ...
0
votes
1answer
378 views

Vagrant w/VirtualBox and Multiple Network Interfaces [closed]

What's the right way to configure multiple network interfaces with Vagrant? Here's the simple Vagrant file I'm testing with: . Vagrant.configure("2") do |config| config.vm.provider :virtualbox do ...
1
vote
1answer
58 views

TCP echo server security [closed]

I am setting up a Linux server similar to a TCP echo server and am wondering about security issues I should be concerned about. This will be a bare bones Centos/KDE server with no additional files ...
1
vote
3answers
146 views

centos unable to access the internet

Problem Cannot access the internet. CentOS guest isn't receiving incoming traffic. Private network is fully accessible. Scratching my head here... I don't have this problem on ...
0
votes
0answers
213 views

Poor network performance when fileshare with CentOS on HyperV

I own Fujitsu Siemens server (TX100 I guess – I am not able to check this as I manage it remotely). I have got Windows 2008 Standard R2 sp1 installed. On this server I run Hyper-V and in it I have ...
0
votes
0answers
117 views

Access KVM guest via hostname on private virtual network

KVM on CentOS 6.5. Setup one bridge connected to internet. And one virtual network on subnet 192.168.100.0/24 DHCP start: 192.168.100.128 DHCP end: 192.168.100.254 How to ...
1
vote
1answer
132 views

Bonding more than 2 nics causes connection drops

I'm running CentOS 6.5. I have 3 servers with quad 1Gb nics. I'm using bonding mode 6 (tried 0 as well) running through a cisco 4948 switch. When only two network cables are attached, no issues. If ...
0
votes
1answer
205 views

some outgoing http connections fail

After a recent reboot, my server is unable to connect via http, but not all the time. I have an accept rule for port 80, here is my iptables: Chain INPUT (policy ACCEPT) target prot opt source ...
1
vote
2answers
89 views

Why am I only able to connect to my server when generating traffic from it? [SOLVED]

UPDATE - Because of the infrastructure changes from the acquisition, there was an IP address conflict. Once that was identified, the behavior stopped, as traffic could consistently be routed to the ...
1
vote
1answer
731 views

Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
3
votes
1answer
146 views

Can't get IPv6 setup statically using CentOS6 on a 1and1 dedicated server

I have a server at 1and1 that I'm trying to setup with a set of static IPv6 addresses. I can't get it to work and have tried every forum and guide I could find on google. Their tech support has told ...
0
votes
2answers
195 views

How to make httpd accessible only through the VPN?

I have a server running PPTP that is supposed to run an httpd (nginx) accessible only through the VPN. I'm also running a few other httpds too, which are not supposed to work on the VPN. routing ...
0
votes
0answers
30 views

How to make httpd accessible only through the VPN?

I have a server running PPTP that is supposed to run an httpd (nginx) accessible only through the VPN. I'm also running a few other httpds too, which are not supposed to work on the VPN. routing ...
0
votes
0answers
205 views

CentOS Latency High Troubleshooting

I have two CentOS servers connected via a 10 Gb fiber optic cable with a network emulator connected between them. All three units sit on a desk in the lab. There is also a regular 1 Gbit Ethernet ...
0
votes
0answers
70 views

CentOS - Dual NICs connected to 2 different networks, works on my Debian Server

First i would like to ya'll know i have a Debian based server that is working perfectly with what i am trying to do. My CentOS server is the one that when duplicating the config, but using different ...
-2
votes
1answer
600 views

What does tcpdump “BOOTP/DHCP, Request from …” mean?

I am seeing extreme amount of network traffic on a host despite it should be idle. When I do tcpdump -nni eth0 not net 10.10.10.10/32 I get lots of these 14:36:07.851048 IP 0.0.0.0.68 > ...
0
votes
1answer
287 views

Ksoftirqd high load

Recently I notice that one ksoftirqd is always in top of my processlist and takes 90% - 100% cpu. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND ...
-1
votes
1answer
215 views

Gnome Network Configuration GUI is missing

Recently installed CentOS 6.4 on a server. I'm not sure if this is something that has to be specifically installed or not, but there is no Network Configuration GUI in Gnome. On other CentOS systems ...
1
vote
1answer
43 views

Server connections not connecting when switching to Static IP

I have a Centos 6.4 based VM, and I'm running Virtualmin on it to host my personal site. The problem is that by default, the OS is using DHCP, even though at router level (virtual router defined ...
4
votes
1answer
266 views

Is IP over FC still crazy complex? [closed]

In the link below, it is explained that 4 years ago IP over FC was crazy complex: How do I set up IP over FC? Is that still the case on CentOS 6?
0
votes
0answers
54 views

VPS - Network doesn't auto start on reboot

I have a VPS running CloudLinux that when I reboot the network service doesn't seem to auto start. On rebooting I can no longer access the sites or SSH and have to go to the VPS console and type ...
16
votes
2answers
271 views

Identification of physical network interface in linux [duplicate]

I'm new to linux and I have server with four network cards. I have to identify which physical network interface is assigned to the names eth0, eth1, eth2 and eth3. I have to disconnect cable from eth2 ...
0
votes
0answers
32 views

making a software router for my private network [duplicate]

give me suggestion on this problem. I have 2 nic cards public ip (eth1) and private ip (eth2). now i have a linux system having centos 6.4. I made this system software router so can access internet on ...
0
votes
0answers
62 views

can i forward internet from 2 public ip to 1 single private ip (network)? [duplicate]

I am rahul and i am new on centos 6. can anyone tell me .. is it possible suppose i have 3 nic cards in the same system and i have 2 nic cards for public ip(Eth1 and Eth2) and default Ethernet for ...