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

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23 views

Is there a way to set a static IP's last 3 digits only in linux? [migrated]

I need to set up several ubuntu systems that will end up being plugged into routers with varying IP addresses. For example, 192.168.1.x or 192.168.0.x, etc. Is there a way of assigning a static IP ...
3
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1answer
99 views

Cisco switch: is it possible to add a user, which would be able to modify a single specific port?

Is it ever possible to delegate control over a single switch's port to an end user? Here's the situation: let's say a company offers colocation service. Each client's server is connected so a port on ...
0
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1answer
13 views

What are the correct filenames for device configs in /etc/network/interfaces.d

It's easy enough to find references to creating network configuration files name eth0.cfg But the are the correct filenames for other devices i.e. eth0:0 I can't find any documentation to explain ...
0
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2answers
23 views

How to determine if auto negotiation with switch is finished

When I connect ubuntu network interface to cisco switch, the ports of switch and ubuntu starts auto negotiation. I need to know if auto negotiation is finished or not. The easy way is ping & ...
0
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1answer
38 views

Network disconnects between 2 sites

I have site A and site B. They are connected essentially via ethernet by an ISP (the ISP uses a radio tower to create a point to point tunnel from A to B and basically provide me an ethernet hookup ...
0
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0answers
34 views

How to publish hostnames of Ubuntu machines using Avahi

How do you configure Avahi on Ubuntu to automatically broadcast and discover the DNS info for each Linux server on a local network? I've ran this on my localhost (hostname mylocalhost) and a test ...
2
votes
1answer
92 views

How to get authoritative answers from nslookup? [closed]

Why is it "Non-authoritative"? Even when I look for yahoo.com ip with ns3.yahoo.com I get Non-authoritative answer. Why does a yahoo server keep stackoverflow's ip? From where do I get ...
0
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1answer
30 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 ...
0
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1answer
26 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. ...
0
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0answers
22 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 ...
0
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0answers
21 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 ...
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0answers
16 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
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0answers
59 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 ...
0
votes
2answers
36 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 ...
2
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0answers
39 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 ...
6
votes
4answers
555 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% ...
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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 ...
3
votes
2answers
49 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 ...
0
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2answers
33 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
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0answers
43 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 ...
1
vote
0answers
12 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 ...
0
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1answer
65 views

Debian Secure Network [closed]

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 ...
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votes
1answer
70 views

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

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. ...
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2answers
52 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
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1answer
19 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 ...
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1answer
23 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 ...
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votes
1answer
37 views

IP Network Best Practice [closed]

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 ...
0
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0answers
35 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 ...
5
votes
3answers
103 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
54 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?
1
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2answers
49 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 ...
0
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1answer
60 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
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2answers
109 views

Managing IPv6 rDNS

Still very new to IPv6 and I talked to my datacenter and they do not do rDNS for IPv6. Unfortunately we currently do not support rDNS for IPv6 allocations. We can however delegate the IP block ...
0
votes
1answer
43 views

What causes “SYN to LISTEN sockets dropped”?

A quite busy proxy server has lots of "SYNs to LISTEN sockets dropped". I learned one cause could be a too small backlog size. But in that case the "times the listen queue of a socket overflowed" ...
0
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0answers
15 views

how to use public ip in my private network [migrated]

I'm trying to use public IP address in my private network. In a short, how to set public IP, which is different to endpoint IP of my private network, to my server in my private network? Is other ...
0
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2answers
44 views

Port forward with iptables

I got lo (127.0.0.1) and eth0 (172.17.0.8). I want to redirect packets that land on 127.0.0.1:80 to 172.17.42.1:80 (route from eth0). I tried iptables -t nat -A OUTPUT -p tcp --dport 80 -d 127.0.0.1 ...
0
votes
1answer
40 views

Ubuntu / node.js dropping incoming requests [closed]

I am getting dropped requests on a node.js server. I have simplified the test case to the point that it must be a problem with system setup. I am a developer and have very little experience with ...
2
votes
1answer
53 views

Where to start with diagnosis of dropped network connectivity on Debian?

We have a number of Xen virtualised servers, all running Debian 6 64bit. We are having an intermittent problem where occasionally a server will stop responding over the network. When this happens we ...
1
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0answers
4 views

Network interface configuration on Debian 6 (No DHCPOFFERS received) [migrated]

I am trying to configure an interface to allow internet connection on a home server which runs Debian 6 x86. The server is behind a router which has DHCP enabled. The router IP is 192.168.1.1 with ...
1
vote
0answers
25 views

Really slow copying a file to a win 8.1 pc over LAN, no other network issues [migrated]

I have a windows 8.1 pc thats being running fine for ages. Suddenly it's unable to play videos from a network share. Digging into it I've found the following: Copying a file from any of the three ...
1
vote
2answers
79 views

ESXi Hypervisor - Cannot get multiple VMs to connect to Internet

Pulling my hair for past few days over this. Can some VMWare ESXi expert help out? I recently decided to give ESXi 5.5 a try. Installed it, got connected through vSphere client, and created few ...
0
votes
0answers
16 views

Hyper-v guest network priority

I have the following configuration: 2 Hyper-v hosts connected using a Dell 1gb switch: Host 1 vms: domain controller which also server as dns server (DC01, ip: 10.2.2.5) fileserver (FS01, ip: ...
3
votes
1answer
118 views

Folder Redirection on Domain Controller Win Server 2008

This is a long post with a few questions in it. They are all related to the same issue though, and solving one or the other will probably solve the others. I did look on superuser for similar ...
0
votes
1answer
66 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 ...
1
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0answers
54 views

Why does my server gets requests for domains that are not mapped to my IP

As title states ... Why does my server (nginx) gets requests for domains that are not mapped to my IP? I've split my nginx logs to create a log file for each website that it processes and i've ...
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1answer
59 views

Map drive from windows to linux file share [closed]

What I would like to do is to fire up a linux based cloud computer and be able to map a network drive from a local windows computer to this remote linux cloud computer. Is this possible?
0
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1answer
41 views

iptables: service per physical interface

I have a vm on which I'm trying to configure (unsuccessfully) one service per physical device - i.e. ssh open only on eth0, http only on eth1 and ftp only on eth2. This has to happen regardless on the ...
1
vote
1answer
36 views

Why do I see so many ssh packets in only a couple seconds?

I am learning how to use tshark so I can better understand networking. As a user the protocol I most often use day to day is SSH. So I thought I'd start a capture filter on ssh packets on my server ...
3
votes
2answers
212 views

tcpdump truncates to 1472 bytes useful data in UDP packets during the capture

I am writing an application which work with network. To perform some tests I need to reproduce the flow which I had a day before. But at the same time it is not allowed to stop the current working ...
0
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2answers
90 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 ...