Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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Alternative ways to track dropped packets and report output

Instead of tailing /var/log/messages or doing a continuous ping is there a way with ifconfig or ethtool to track dropped packets, collisions, or tx/rx errors in real time?
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35 views

How to find out PID of the process sending packets (generating network traffic)?

Couple of weeks ago I had an issue where I changed DNS addresses in large network of around 300 nodes. After that, some of the nodes still continued to ask old DNS servers, although resolv.conf was ...
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What are the pros and cons of large receive offload (LRO) vs generic receive offload (GRO)

I have been debugging a scenario where an ESX vmware host is communicating with a virtual linux machine via a virtual switch using TCP/IP. After a congestion event the vmware host is waiting for an ...
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24 views

How to configure 2 NICs on a server

Our office has a server with two NICs. We have two group at our office. Say Group A and B We have two internet connection both connected/plugged in to different switch. Both group need to access ...
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1answer
41 views

routing a second public IP to multiple VM's

myself and a friend have rented a dedicated server and have used KVM and libvirt to create virtual machines for us to use. (we are using debian jessie on the host) we purchased two additional IP ...
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14 views

Mac minis disconnecting from 1GbE: RFI / EMI?

We have several 2012 Mac minis in our server room that reliably disconnect from 1GbE network (but otherwise appear to still be working) when the adjacent servers are under heavy CPU load. We suspect ...
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27 views

My NIC keeps getting the same ip 196.256.x.x [migrated]

I have a strange issue with my network card in my pc. My internal network adapter keeps getting an ip that does not come from the DHCP ADSL router that i have connected it. I have changed cable, i ...
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2answers
37 views

Enabling bridged connections with a single network card with multiple IP addresses

I have a server with one network card in it (eth1). My server is assigned 5 public IP addresses and it is currently configured like this (/etc/network/interfaces): # The primary network interface ...
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3answers
46 views

Mount a drive at login time

I need to mount a drive at login time. I have the home directories in the server, and when a user logs in at a client machine (debian 7), I need to mount his directory temporally at a mount point, ...
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31 views

internet timeout every half hour or so. mutiple vlans affected (all wan access is affected) internal network continues to work

i'm facing a strange issue. our internet is dropping out every 20, 10 or 30 min. it's not exact but sometimes even every 5 minutes. the connection restores usually a minute later. but i'm not able to ...
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35 views

Routing with multiple NICs on debian

I have a machine with two NICs on different network segments, I've set up routing for the different segments. It works if I run all the routing commands manually, but I can't get it to work when ...
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21 views

Port forwarding to different subnet

I have two routers: router A with internet access, and router B acting as wireless access point. Devices are attached to router B via ethernet. I need to forward some ports to PCs attached to router ...
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1answer
68 views

Slow download big static files from nginx

I'm using debian 7 x64 in vmware-esxi virtualization. Max download per client is 1mb/s and nginx no use more than 50mbps together and my question is what may cause so slow transfers? server ...
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1answer
65 views

Concurrent TCP connections on Azure can be upto 500K. Really?

Let me be very clear at the outset that I am new to cloud technology. All I know is cloud servers are easily scalable (i.e. adding physical hardware is transparent to applications and users) and ...
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2answers
40 views

Static IP injection to guest VM in Win2k8

Is there a way to inject IP address and do network configuration of a CentOS VM running on Windows server 2008? In Win2k12 there is SetGuestNetworkAdapterConfiguration using which IP address can be ...
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1answer
48 views

How to find which routing protocol a router is using. And if found how to test it

I was recently asked a networking question in an interview which I did answer but the interviewer was not pleased. The question was : "Given an actively running router, how would you know what ...
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1answer
43 views

DNS resolving is slow only when using cURL to fetch data

I have domain 'engine02.prod.qc.offercal.com' in my local bind9. I don't think it's DNS server or TTL issue, because the benchmark is almost always look like this (I tried for 2 minutes using each ...
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2answers
57 views

How to route outbound traffic for a particular destination IP address to GRE Tunnel in CentOS?

Hello I am trying to configure a network like this network diagram :- Well I have to create a GRE Tunnel at my alpha server and route some particular traffic to GRE Tunnel.I want to do the configs ...
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35 views

QEMU/KVM port forwarding issues

I'm trying to access websites hosted on a QEMU/KVM debian virtual machine from a Ubuntu host machine and other PCs/devices on the host machine's network. Later, I'd like to access this from the ...
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1answer
94 views

Mikrotik RB2011U vlanning

I am having trouble getting port based vlanning/trunking working on a Mikrotik RB2011U. I have been following the guide located here: ...
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1answer
38 views

Forwarding a port on the loopback interface to a remote IP/port

I have two Docker containers that I'm trying to network together in a specific way. Container A is running a Redis server on port 6379. Container B is running an interactive shell and needs to access ...
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2answers
85 views

Apache 500 error with no entries in error.log [duplicate]

This is on a brand new Ubuntu 14.04 Server running a standard WAMP install with Apache DAV_SVN (using LDAP Authentication) added on top of it (mapped to /svn). I was able to get everything working ...
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1answer
19 views

dnsmasq to server different ip depending on which NS is used

I want to simulate the following situation: If the client makes a request using NS1 for DOMAIN1 return IP1 If the client makes a request using NS2 for DOMAIN1 return IP2 i.e resolve the domain to a ...
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1answer
28 views

Connecting to web server through eth1

So I am having issues with connecting to my web server via eth1. ifconfig eth0 Link encap:Ethernet HWaddr 00:50:c2:27:bf:6e inet addr:10.8.105.8 Bcast:0.0.0.0 Mask:255.255.0.0 UP ...
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1answer
26 views

accessing ip_conntrack causes concurrency problems after yum update

I have a Centos 5.11 server, and a script I cron every 10 minutes The script is simply this #!/bin/sh FNAME=/var/www/html/cached/conntrack_count COUNT=`cat /proc/net/ip_conntrack | /usr/bin/wc -l` ...
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34 views

CoreOs Guest with static IP by config drive

I want to configure a static IP for my CoreOS guest following this tutorial: http://www.chrismoos.com/2014/05/28/coreos-with-cloud-config-on-vmware-esxi While my hostname is set correctly my ip ...
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1answer
64 views

2 NICs, same subnet, different default gateways

I have a switch on which 4 modem/routers and 2 servers are connected. Each server has 2 processes running and 2 NICs connected. What I want is that each process is routed out of either one of the ...
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1answer
90 views

Set up network interfaces in Ubuntu for KVM virtual machine

I am currently renting an Ubuntu server. On this machine I would like to run virtual machines using KVM. For some web access I have installed Kimchi, a very simple html5-based KVM management tool. ...
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1answer
18 views

VPN tunnel from client A through relay B to server C

I need to send traffic from a client machine, A, to a VPN server, C, but through a relay host, B. All three of them have public IPv4 addresses, but for policy reasons, A must not send traffic ...
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1answer
19 views

DNS or Hostname - seems to change whether a machine can be accessed or not

So I work on a large environment with multiple countries and a large DNS structure. Because of this we sometimes have issues where machines that have not been on the network for a while keep the ...
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1answer
25 views

How to see routes for a specific Host

I have a project that requires me to send traffic out a specific Port on a Server the server has 7 Ethernet Ports . I have created the IP rules to send data from a certain host to a certain port. I ...
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41 views

Decrypt All traffic by wireshark [closed]

Ok I can decrypt a specified client connected to wifi by deauthing it and getting the handshake using wireshark. In fact after wireshark captures the EAPOL messages it starts to decrypt the traffic. ...
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1answer
36 views

How to connect Network and GRE Tunnel Traffic and control and flow of TCP/UDP Packets?

I need some serious help with a complex routing setup I am doing. Lets I have a /24 IPv4 .I am announcing the same /24 at two different locations. One is a ISP exchange center where all the ISPs peer ...
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37 views

How to enable routing in Esxi 5.5 server on HP ProLiant DL 580 G5

We have setup Esxi 5.5 on HP ProLiant DL 580 G5 server with 4 network cards like nic0 to nic3 . At the moment it is in our office environment and we have created Virtual machines on it. This is ...
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3answers
43 views

How do I know the type of connection from the IP Address? [closed]

The website GameFAQs uses the IP Address to know the type of connection and decide the level of a new user. See image: http://i.imgur.com/ZfJK8JH.png How does it determine the type of connection ...
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1answer
58 views

Running Vagrant/libvirt: trying to establish public/private networks

I'm running Vagrant 1.7 (from their official 1.7 packages) on Ubuntu 14.04 LTS and I'm trying to provision several private VMs and one public one. My Ansible provisioning scripts change all the ...
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Merging internet for much bandwidth for Lan

I have an office network .here we have 2 floors with 2 internet connections from same ISP . My question how is it possible to merge two internet connections and provide to the lan as a single ...
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37 views

Routing VPN traffic between two networks

I have recently set up a two-network bridge using OpenVPN (Connect two networks with OpenVPN) The following things work: -Pinging any Network 2 computers from Network 1 Gateway (10.0.1.9) -Pinging ...
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1answer
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connect layer-3 switch stack's, lacp or ospf

I have a main and several satellite site's. Between the main and the satellite site's, there are 2 physical links. all site's have 2 layer-3 switches that are capable of dt-LACP (an LACP trunk, ...
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26 views

How to map single NAT with multiple public IPs

Currently this is the our office network. We currently have a single Public ip from the ISP and we have created a single Private ip network behind the NAT as shown below : public ip ( WAN ) - ...
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8 views

Virtualbox Network Adapter Not Found on Import [migrated]

I am running VirtualBox on Ubuntu 12.04 on an old box. VMs are configured for bridged networking. I have recently setup a new box with Ubuntu 14.04 and imported my VMs from the old box to the new ...
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26 views

VPN-tunnel renegotiation problems

I have an application running on top of Celery with redis as a broker. Redis is hosted at our datacenter but the workers are hosted on a separate line. We have setup two-way communcation between the ...
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2answers
50 views

IP Address reassignation (unused Ip address)

Available IPv4 address blocks are exhausted and price per IPv4 address is increasing. However I read that 2/3 of IP address remains unused because they were assigned improperly at first stages. Since ...
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2answers
72 views

Connect two networks with OpenVPN

I am trying to connect two networks together via OpenVPN. Gateways can ping each other, however they cannot access other computers on the network they're joining. Logs don't show any errors, and the ...
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6answers
2k views

Network bridging - what's the point?

I'm having hard time trying to understand how bridges work. What's the idea behind them? Most sources say their main role as connecting two LANs. They are layer two devices. But wait a second, how can ...
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23 views

Split TCP packet - Data layer vs IPv4Layer

What is the different between split TCP packet in the Data layer compare to split the packet in IPv4Layer ?
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Intermitent Hyper-V Cluster Network connectivity loss - Server 2012 R2

I am running a 3 node Windows Server 2012 R2 Datacenter Hyper-V cluster on three DL560s together with a HP P2000 SAN (FC) and HP 1810-24G v2 Switches. I have been experiencing intermittent network ...
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2answers
52 views

How to get/retrive the list of Interface, vlans, port id, and mac address in juniper via snmp?

Below are the following commands I used to get the specific data that I need in a juniper switch. Get Port Id and Interface snmpwalk -r:"switchName" -v:2 -t:10 -c:"*******" ...
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3answers
65 views

Remotely connect to device with ip from different subnet

I have to figure out some way to remotely connect to D-LINK switch currently working on default address 10.90.90.90 (service guys have replaced broken one, but they have forgotten to do initial ...
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connect virtual switch to multiple physical networks [migrated]

Recently I set up a few Hyper-V servers on my windows 8.1 (Pro) laptop. I connected all of them to a single virtual switch. Now I want to connect the virtual switch to the physical network (instead of ...