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

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2
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3answers
1k views

Linux machine does not answer an ARP request

We have this situation: A router, which is an Ubuntu VM, has multiple VLAN interfaces on the same physical NIC. Those VLAN interfaces are dynamically configured and torn down and attached to networks ...
0
votes
1answer
21 views

Can we provide an stack of IP's to the Open Vswitch to pick the IP?

I have started learning virtualization using KVM hypervisor and trying to set-up virtual cluster on the host machine.However from the tutorials on the internet states that the VM connected to OVS ...
2
votes
8answers
10k views

Why would cat6 connectors not work with cat5e patch cable?

I had a naff batch of cat5 connectors (the latching mechanism didn't work) so decided to order in some cat6 connectors in preparation for the inevitable upgrade. My existing reel of for making patch ...
0
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0answers
18 views

Creating virtual cluster on KVM hypervisor

I have just started learning virtualization using KVM hypervisor and installed kvm, libvirt and qemu on ubuntu and trying to create the virtual cluster on my host machine for the guest vm's. for ...
-1
votes
0answers
26 views

DHCP offer is unicast at both L2 and L3; how? [on hold]

Recently I observed The DHCP Offer by the server is unicasted as requested by client in DHCP discover Broadcast flag. In the wireshark capture,the offerpacket had L2(Dest-Mac) and L3(Dest-IP ) ...
1
vote
2answers
790 views

How can I configure my network to allow bi-directional traffic between two lans?

Here's my current setup: (and it may require reworking): 2 LAN networks - 192.168.41.0, 192.168.21.0 2 Public IP's (they are assigned to us by specifying MAC Addresses - not subnetted) ...
0
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0answers
25 views

How to change mode from manged to monitor on mon0 interface on NIC?

I am connecting to a home router using wifi. The detais of my wireless cards are as follows: #lspci 01:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01) #lspci -vv ...
0
votes
1answer
16 views

Advice on how to convert a small, completely peer-to-peer network into a client/server type network?

I apologise in advance if I use the wrong terminology or have stupid ideas about the way things work. I am a newbie but I am really interested in learning and I hope that you may be able to help me. ...
5
votes
5answers
19k views

How to list all physically installed Network Cards (Debian)?

My "Dedicated Server" should have two NICs installed but I can only find one. My Question: What other commands and methods are available to test how many network cards are installed on my server ...
0
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0answers
10 views

HyperV VMs loose Network connectivity periodically

I have a Server 2012 R2 Host running several HyperV VMs. The VMs are running various different OS Linux, Server 2008 R2 and Server 2012 R2. Everything is working great apart from the fact that all ...
6
votes
3answers
4k views

Domain Controller thinks its on a Public Network

We have a Server 2008 R2 Primary Domain Controller that seems to have amnesia when it comes to working out what kind of network it is on. The (only) network connection is identified at startup as a ...
0
votes
0answers
15 views

What is causing `skb rides the rocket` errors?

On one of our busy (virtual) Debian 6 servers we are seeing a lot of messages in the syslog like this: kernel: xen_netfront: xennet: skb rides the rocket: 19 slots We are seeing some connectivity ...
6
votes
4answers
470 views

How to pinpoint which process/activity/software/protocol is slowing down LAN on a single computer

From this question about debugging our business LAN I've been able to pinpoint a single computer which slows down our network. When the computer is turned on and connected to the network, roughly 5% ...
1
vote
1answer
818 views

“RTNETLINK answers: File exists” after upgrading to Debian 7

I upgraded my system from Debian 6 to Debian 7.3 yesterday. After rebooting, I chose the new kernel linux-image-3.2.0-4-amd64 and the network became unavailable. I tried sudo service networking ...
-2
votes
0answers
15 views

Cannot proxy web traffic under an adoc network [on hold]

I'm attempting to create a local proxy with a computer-to-computer adhoc network on OS X Yosemite. Before creating and connecting to the adhoc network, I update my network preferences to proxy ...
6
votes
6answers
18k views

How to use a Tone Generator to trace a network cable

We have a tone generator kit for tracing network cables, but I am having trouble using it correctly. The tone generator end plugs into the network cable I am trying to trace, and then I assume I ...
-1
votes
0answers
13 views

Can't browse 2K12 Server shares from a server, but can on a PC on the same network

hoping someone can help. I have a VM server hosted remotely. I can browse the shares on said server by typing the IP into explorer. I can then see the shares. If I do the same thing on the server, ...
0
votes
0answers
39 views

NetBIOS ping issues

I am having an issue with NetBIOS Pinging. When I ping a PC/Server on the network with its NetBIOS Name I am finding that the PC/Server is getting associated with an IP address outside my network (IP ...
1
vote
2answers
1k views

Ubuntu Server, 2 Ethernet Devices, Same Gateway - Want to force internet traffic through 1 device (or at least allow it to work!)

I have a Ubuntu 10.04 Server with 2 ethernet devices, eth0 and eth1. eth0 has a static IP of 192.168.1.210 eth1 has a static IP if 192.168.1.211 The DHCP server (which also serves as the internet ...
0
votes
0answers
60 views

Multilayer LACP

I have a network switch that is limited to 2x1Gb/s LACP teaming, however have a file server with a 4x1Gb/s network interface. What options do I have to aggregate all available bandwidth without ...
0
votes
1answer
39 views

Debian Secure Network [on hold]

I have an industrial PC with 3 Ethernet ports (RJ45, 100 MB/s). I would like to designate one as an incoming internet connection (from the company), and the other two on a private network. The private ...
0
votes
2answers
14 views

Load balancing IPTABLES POSTROUTING rules

I have an interface with 5 IP addresses assigned to it (as virtual adapters) let's call them x1,x2,x3,x4 and x5. Currently I have SNAT POSTROUTING forwarding rules from local source range to specific ...
0
votes
0answers
5 views

Accessing GAE sites within VMWare fusion 7.x [on hold]

Has anybody figured out how to access Google App Engine sites from within vmware fusion? I have it set to NAT and am able to access "localhost" just fine. But trying to access a number of sites I ...
2
votes
0answers
16 views

Debugging slow Quickbooks in multi-user mode

Building 1: Main QB server with 15 users Building 2: 12 users accessing the QB server There is no sluggishness in building 1. Building 2 has issues. They can RDP to the server fine with no lag but ...
3
votes
2answers
39 views

After a while ssh connection freezes when a command run remotely produces a lot of output

The situation is this: there is a an ssh client (Ubuntu 14.04) and an ssh server (Debian 7). There is a bunch of networking in between them. SSH connection is easily (and quickly) established and ...
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votes
0answers
15 views

cannot access trendnet wireless box [migrated]

My Trendnet TEW-452BRP wireless router is connected with a NetGear ProSafe VPN firewall FVS318 router right now. They are working fine. I am right now connected with wireless. I try to change the ...
0
votes
0answers
26 views

Trying to use traceroute and mtr but getting nowhere [on hold]

How come every mtr command try stops at the second hop, like this... [ me@localhost ~ ] mtr www.google.com 1. 192.168.1.1 2. ??? And every traceroute command i try does the following... [ ...
-1
votes
2answers
29 views

Simulate WAN / Route Between 2 Virtual networks (Vmware)

i am in the process of doing some Labs on VMWARE ESXI 5.5, i am currently testing replication between 2 AD sites, i have set up Site A containing 2 DC's and want to setup Site B Contains 2 DC's as ...
0
votes
2answers
31 views

Distribute a network with sub networks properly

Currently i have only 1 subnet 192.168.1.0/24 with the following Group1: Servers 192.168.1.240-192.168.1.250 Group2: Printers, Scanners 192.168.1.2-192.168.39 Gateway, DHCP 192.168.1.1 Group3: ...
0
votes
0answers
16 views

Docker debian slow dns resolve

I got terribly slow dns resolve inside my ubuntu when using wget or curl, apt-get,... root@815340a37f0e:/# time curl www.google.com ... real 0m5.132s user 0m0.006s sys 0m0.003s When I do ...
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votes
0answers
16 views

Linux - modify incoming packets before forwarding: [on hold]

I'm using a Linux (Debian based) system on which IP forwarding is enabled (/proc/sys/net/ipv4/ip_forward is set to 1). I can read the incoming packets using a raw sockets program, but I want to modify ...
0
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0answers
5 views

IGMP Snooping limitations and when do you start to use PIM?

At a head end I've just inherited, all our multicast streams run on cisco switches with IGMP snooping enabled. Because all these streams are to be kept local and isolated we've never really looked ...
2
votes
2answers
1k views

How do I rename a NIC: eth2 -> eth1

I've installed a new NIC. It shows up as eth2. I'd like it to be eth1. How I can do this?
-1
votes
1answer
33 views

Cant RDP if VPN IPv4 uses default gateway on remote network flag [on hold]

Thanks in advance for any help. I apologise if anything doesn't make sense. I haven't done any professional networking before, only studied it at uni 3 years ago and everything is a little blurred. ...
0
votes
1answer
40 views

NTttcp shows slower throughput on loopback (127.0.0.1) than on network

I am using NTttcp to find a baseline for what throughput I can expect between a client and server on windows. When I ran the client and server on two different machines on our LAN I got the following ...
0
votes
1answer
14 views

Should you use secondary IP configuration to configure applications in EC2?

I am using DHCP to assign primary IP addresses in a subnet within a Windows Amazon Web Services EC2 instance To avoid issues where the boxes are rebooted and the DHCP address changes, I have assigned ...
0
votes
1answer
33 views

Assign more than one IP address to DNS [on hold]

i have create my own DNS with one ip address but i want to give multiple IP address to that DNS. is it possible to assign ?
1
vote
1answer
883 views

TCP Zero Window with no corresponding Window Update

I am trying to debug a network issue and am using Wireshark and tcpdump to grab packets from my server. I have one client application that is grabbing all my available connections and then holding ...
-1
votes
1answer
13 views

enable java app to establish http connection under network of VPN.

Some relative question http://stackoverflow.com/questions/17170980/connect-to-http-server-behind-vpn-with-java has already asked in Stack Overflow while I don't still have a solution since this should ...
-1
votes
1answer
35 views

IP Network Best Practice [on hold]

On my On Premise network we use IP Span 172.17.101.0-172.17.103.254 I should now connect our Windows Azure network to the On Premise network using VPN. Is it okay to use IP Span 172.16.1.0 in the ...
1
vote
1answer
2k views

ping works but ssh fails

machine1 IP: 172.30.11.119 machine2 IP: 172.30.11.120 machine3 IP: 172.30.11.121 machine4 IP: 172.30.11.122 Note: These machines are connected to LAN. I have configured the static ...
-1
votes
0answers
16 views

virtualizing a switch for vyos test lab [on hold]

first of all, sorry if this is not the right site to ask my question, im very new on networking and stack exchange has a lot of sites and i don't know where does my question fit (if it fits) i have to ...
4
votes
3answers
91 views

Can't access Exchange OWA from Wireless Subnet - Firewall rule?

The Problem The issue is that I can't access port 80 (or 443) on the Exchange server, unless I add a blanket rule to allow all traffic from the client to the server's subnet. If I add a rule to ...
0
votes
0answers
18 views

Centos and Strongswan

I'm trying to implement a strongswan solution for a site to site tunnel between me and a third party vendor. My tunnel establishes fine between myself and the vendor however I am wondering if this is ...
4
votes
1answer
1k views

Weird network problems with Vagrant, VirtualBox, Ansible and Ubuntu Server box

We are using Vagrant and Ansible to provision VirtualBox machine. It was working great, but recently we've started to encounter some weird network problems with tasks that require access to the ...
4
votes
3answers
74 views

Converting VMware VMs to Hyper-V

Our company is looking to try out Hyper-V as a server virtualization solution so I am looking for the most efficient way to test everything out safely. My plan is to make a snapshot backup of each of ...
0
votes
1answer
44 views

very long “connecting” in chrome using ipv6

A connection to an ipv6 subdobain www6.example.com takes very long. In chrome the net tab shows 20s spend in "connecting". All other times are much faster. However only the first two connections are ...
1
vote
2answers
44 views

How to pinpoint why a specific ressource (image or library) slowing down page load

We have a small network (maybe 15 users at top business hours, around 30 devices) managing internet connection and phone lines. The primary use of the network is for users to access the web based ...
1
vote
1answer
42 views

What is the difference between an Up MEP and a Down MEP for Ethernet OAM CFM?

I'm having trouble understanding the functional difference between an Up MEP and a Down MEP in CFM applications. Some sites say they are defined based on network direction, others seem to think they ...
0
votes
0answers
32 views

Preparing CentOS 7 as a virtual machine

I've removed the HWADDR from ifcfg-eth0 and touched /.unconfigured, but when I restart the virtual machine, HWADDR is not added back to the ifcfg-eth0. Is there something else we should be doing?